a_axis_radius~aaxisradius~The a_axis_radius element provides the value of the semimajor axis of
  a_axis_radius~aaxisradius~the ellipsoid that defines the approximate shape of a target body.  'A'
  a_axis_radius~aaxisradius~is usually in the equitorial plane.
  abstract_text~abstracttext~The abstract_text element provides a free-form,
  abstract_text~abstracttext~unlimited-length character string that gives a brief
  abstract_text~abstracttext~summary of a labeled document, differing from DESCRIPTION
  abstract_text~abstracttext~in that the text could be extracted for use in a
  abstract_text~abstracttext~bibliographic context.
  acceptance_detector_desc~acceptdetd~Definition TBD.
  acceptance_information_desc~acceptinfod~Definition TBD.
  pds_address_book_flag~addrbookflg~ The pds_address_book_flag data element indicates whether
  pds_address_book_flag~addrbookflg~or not a registered PDS user will have an entry in the PDS
  pds_address_book_flag~addrbookflg~telephone directory.
  address_text~addresstext~The address_text data element provides an unlimited-length,
  address_text~addresstext~formatted mailing address for an individual or institution.
  algorithm_desc~algd~The algorithm_desc element describes the data
  algorithm_desc~algd~processing function performed by an algorithm and the data
  algorithm_desc~algd~types to which the algorithm is applicable.
  algorithm_name~algname~The algorithm_name element provides (where applicable) the
  algorithm_name~algname~formal name which identifies an algorithm.
  algorithm_name~algname~Example value:  RUNGE-KUTTA.
  algorithm_version_id~algverid~The algorithm_version_id element identifies
  algorithm_version_id~algverid~(where applicable) the version of an algorithm.
  alias_name~aliasname~The alias_name element provides an alternative term or
  alias_name~aliasname~identifier for a data element or object.
  alias_name~aliasname~Note:  In the PDS, values for alias_name are accepted as
  alias_name~aliasname~input to the data system, but automatically changed into
  alias_name~aliasname~the approved term to which they relate.
  alternate_telephone_number~altphonenum~ The alternate_telephone_number data element provides an
  alternate_telephone_number~altphonenum~alternate telephone number for an individual or node.
  alternate_telephone_number~altphonenum~(Includes the area code.)
  antecedent_software_name~antswname~The antecedent_software_name element identifies the
  antecedent_software_name~antswname~processing software which is commonly applied to a science
  antecedent_software_name~antswname~data set before processing by the subject software.
  applicable_stop_sclk~appstopsclk~The applicable_stop_sclk element is an alias within AMMOS for
  applicable_stop_sclk~appstopsclk~spacecraft_clock_stop_count.
  applicable_stop_time~appstoptime~The applicable_stop_time element is an alias within AMMOS for
  applicable_stop_time~appstoptime~stop_time.
  applicable_stop_time~appstoptime~Note:  The current AMMOS recommendation is to use stop_time
  applicable_stop_time~appstoptime~instead.
  applicable_start_sclk~appstrtsclk~The applicable_start_sclk element is an alias within AMMOS
  applicable_start_sclk~appstrtsclk~for spacecraft_clock_start_count.
  applicable_start_time~appstrttime~The applicable_start_time element is an alias within AMMOS
  applicable_start_time~appstrttime~for start_time.
  applicable_start_time~appstrttime~Note:  The current AMMOS recommendation is to use start_time
  applicable_start_time~appstrttime~instead.
  archive_file_name~archfname~The archive_file_name element provides the file_name under
  archive_file_name~archfname~which a discrete entity is stored on the archive medium. It
  archive_file_name~archfname~is typically used when the project-supplied file name does
  archive_file_name~archfname~not meet PDS standards and must be changed on the archive
  archive_file_name~archfname~medium.
  ascending_node_longitude~ascnodelon~The ascending_node_longitude element provides the value of
  ascending_node_longitude~ascnodelon~the angle measured eastward along the ecliptic from the
  ascending_node_longitude~ascnodelon~vernal equinox to the ascending node of the orbit.
  ascending_node_longitude~ascnodelon~The ascending node is defined as the point where the body
  ascending_node_longitude~ascnodelon~in its orbit rises north of the ecliptic.
  author_full_name~authfullname~The author_full_name element provides the full_name of an
  author_full_name~authfullname~author of a document.  See also:  full_name.
  availability_id~availid~The availability_id element is a numeric key
  availability_id~availid~which identifies the availability of the subject program or
  availability_id~availid~algorithm (e.g., program permanently on line, user request
  availability_id~availid~necessary for operator to load program, program undergoing
  availability_id~availid~development and testing--use at own risk).
  average_eccentricity~avgecc~ The average_eccentricity element provides the value of the
  average_eccentricity~avgecc~eccentricity of the predicted orbit.
  average_inclination~avgincl~ The average_inclination element provides the value of the
  average_inclination~avgincl~angle of inclination of the predicted orbit with respect to
  average_inclination~avgincl~the xy-plane of the J2000 coordinate system.
  available_value_type~avlvaltype~The available_value_type element indicates whether the
  available_value_type~avlvaltype~available values for a PDS data element consist of a set of
  available_value_type~avlvaltype~literal values or represent example values (i.e. values
  available_value_type~avlvaltype~which must conform to a formation rule).  Example values:
  available_value_type~avlvaltype~L (available values are literal values), or X (available
  available_value_type~avlvaltype~values are example values).
  axes~axes~The axes element identifies the number of axes or dimensions
  axes~axes~of an array or qube data object.
  axis_interval~axisinterval~The axis_interval element identifies the spacing of
  axis_interval~axisinterval~value(s) for an ordered sequence of regularly sampled data
  axis_interval~axisinterval~objects along a defined axis.  For example, a spectrum
  axis_interval~axisinterval~measured in the 0.4 to 3.5 micrometer spectral region at
  axis_interval~axisinterval~0.1 micrometer intervals, but whose values are stored in
  axis_interval~axisinterval~decending order in an ARRAY object would have an
  axis_interval~axisinterval~axis_interval = -0.1.  For ARRAY objects with more than 1
  axis_interval~axisinterval~axis, a sequence of values is used to identify the
  axis_interval~axisinterval~axis_interval associated with each axis_name.
  axis_items~axisitems~The axis_items element provides the dimension(s) of the
  axis_items~axisitems~axes of an array data object. For arrays with more than 1
  axis_items~axisitems~dimension, this element provides a sequence of values
  axis_items~axisitems~corresponding to the number of axes specified.  The
  axis_items~axisitems~rightmost item in the sequence corresponds to the most
  axis_items~axisitems~rapidly varying axis, by default.
  axis_name~axisname~The axis_name element provides the sequence of axis names
  axis_name~axisname~of a qube or array data object, and identifies the order in
  axis_name~axisname~which the axes are stored in the object.  By default, the
  axis_name~axisname~first axis name in the sequence identifies the array dimen-
  axis_name~axisname~sion that varies the slowest, followed by the next slowest,
  axis_name~axisname~and continuing so the rightmost axis named varies the
  axis_name~axisname~fastest.  The number of names specified must be equal to the
  axis_name~axisname~value of the axes element.
  axis_name~axisname~Note:  For ISIS qube data objects, the most frequently
  axis_name~axisname~varying axis is listed first, or leftmost, in the sequence.
  axis_order_type~axisordtype~The AXIS_ORDER_TYPE element is used to identify the storage
  axis_order_type~axisordtype~order for elements of a multidimensional ARRAY object.  The
  axis_order_type~axisordtype~default storage order for an ARRAY object presumes the
  axis_order_type~axisordtype~rightmost or last index of a sequence varies the fastest.
  axis_order_type~axisordtype~This is the ordering used in the C programming language and
  axis_order_type~axisordtype~is equivilant to ROW_MAJOR storage order for COLUMN
  axis_order_type~axisordtype~elements within tables.  Specifying an AXIS_ORDER_TYPE of
  axis_order_type~axisordtype~FIRST_INDEX_FASTEST may be used for ARRAYs that must be
  axis_order_type~axisordtype~labelled and referenced in the reverse, and is the ordering
  axis_order_type~axisordtype~used in the Fortran programming language.
  axis_start~axisstart~The axis_start element identifies the starting value(s) for
  axis_start~axisstart~an ordered sequence of regularly sampled data objects.  For
  axis_start~axisstart~example, a spectrum that was measured in the 0.4 to 3.5
  axis_start~axisstart~micrometer spectral region at 0.1 micrometer intervals, but
  axis_start~axisstart~whose values are stored in decending order would have
  axis_start~axisstart~axis_start = 3.5 and axis_interval = -0.1.  For ARRAY
  axis_start~axisstart~objects with more than 1 axis, a sequence of values is used
  axis_start~axisstart~to identify the axis_start value for each dimension.
  axis_stop~axisstop~The axis_stop element identifies the ending value(s) for an
  axis_stop~axisstop~ordered sequence of regularly sampled data objects.  For
  axis_stop~axisstop~example, a spectrum that was measured in the 0.4 to 3.5
  axis_stop~axisstop~micrometer spectral region at 0.1 micrometer intervals, but
  axis_stop~axisstop~whose values are stored in decending order may have
  axis_stop~axisstop~axis_stop = 0.4 and axis_interval = -0.1.  For ARRAY
  axis_stop~axisstop~objects with more than 1 axis, a sequence of values is used
  axis_stop~axisstop~to identify the axis_stop value for each dimension.
  axis_unit~axisunit~The axis_unit element provides the unit(s) of measure of
  axis_unit~axisunit~associated axes identified by the axis_name element in an
  axis_unit~axisunit~ARRAY data object.  For arrays with more than 1 dimension,
  axis_unit~axisunit~this element provides a sequence of values corresponding to
  axis_unit~axisunit~the number of axes specified.  The rightmost item in the
  axis_unit~axisunit~sequence corresponds to the most rapidly varying axis, by
  axis_unit~axisunit~default.
  azimuth~az~The azimuth element provides the azimuth value of a point
  azimuth~az~of interest (for example, the center point of an image of a
  azimuth~az~solar system object taken from a lander or a rover).
  azimuth~az~Azimuth is an angular distance from a fixed reference
  azimuth~az~position.
  azimuth~az~Azimuth is measured in a spherical coordinate system, in a
  azimuth~az~plane normal to the principal axis.  Azimuth values
  azimuth~az~increase according to the right hand rule relative to the
  azimuth~az~positive direction of the principal axis of the spherical
  azimuth~az~coordinate system.  See elevation.
  band_bin_detector~bandbindet~The band_bin_detector element of a Standard ISIS Qube
  band_bin_detector~bandbindet~provides the sequence of spectrometer detector numbers
  band_bin_detector~bandbindet~corresponding to the bands of the qube.  Detector numbers
  band_bin_detector~bandbindet~are usually assigned consecutively from 1, in order of
  band_bin_detector~bandbindet~increasing wavelength.
  band_bin_grating_position~bandbingrpos~The band_bin_grating_position element of a Standard ISIS
  band_bin_grating_position~bandbingrpos~Qube provides the sequence of grating positions which
  band_bin_grating_position~bandbingrpos~correspond to the bands of the qube.  Grating positions are
  band_bin_grating_position~bandbingrpos~usually assigned consecutively from 0, and increasing
  band_bin_grating_position~bandbingrpos~position causes increasing wavelength for each detector.
  band_bin_original_band~bandbinoband~The band_bin_original_band element of a Standard ISIS Qube
  band_bin_original_band~bandbinoband~provides the sequence of band numbers in the qube relative
  band_bin_original_band~bandbinoband~to some original qube.  In the original qube, the values
  band_bin_original_band~bandbinoband~are just consecutive integers beginning with 1.  In a qube
  band_bin_original_band~bandbinoband~which contains a subset of the bands in the original qube,
  band_bin_original_band~bandbinoband~the values are the original sequence numbers from that
  band_bin_original_band~bandbinoband~qube.
  band_bin_standard_deviation~bandbinstddv~The band_bin_standard_deviation element of a Standard ISIS
  band_bin_standard_deviation~bandbinstddv~Qube provides the sequence of standard deviations of
  band_bin_standard_deviation~bandbinstddv~spectrometer measurements at the wavelengths of the bands
  band_bin_standard_deviation~bandbinstddv~in the qube.
  band_bin_unit~bandbinunit~The band_bin_unit element of a Standard ISIS Qube
  band_bin_unit~bandbinunit~identifies the scientific unit of the values of the
  band_bin_unit~bandbinunit~band_bin_center element.  Currently this must be
  band_bin_unit~bandbinunit~MICROMETER, since band_bin_center must have wavelength
  band_bin_unit~bandbinunit~values.
  band_bin_width~bandbinwidth~The band_bin_width element of a Standard ISIS Qube provides
  band_bin_width~bandbinwidth~the sequence of widths (at half height) of the spectrometer
  band_bin_width~bandbinwidth~response functions at the wavelengths of the bands in the
  band_bin_width~bandbinwidth~qube.
  bands~bands~The bands element indicates the number of spectral bands in
  bands~bands~image or other object.
  band_sequence~bandseq~The band_sequence element identifies the order in which
  band_sequence~bandseq~spectral bands are stored in an image or other object.
  band_sequence~bandseq~Note:  In the PDS, this data element is used to identify
  band_sequence~bandseq~the primary colors composing a true color image.  The
  band_sequence~bandseq~standard values that appear in sets of three support color
  band_sequence~bandseq~image display.  They are not appropriate for describing
  band_sequence~bandseq~multi-spectral bands.  For these, it is advisable to use
  band_sequence~bandseq~the sampling_parameter keywords defined elsewhere in the
  band_sequence~bandseq~PSDD.
  band_storage_type~bandstortype~The band_storage_type element indicates the storage
  band_storage_type~bandstortype~sequence of lines, samples and bands in an image.  The
  band_storage_type~bandstortype~values describe, for example, how different samples are
  band_storage_type~bandstortype~interleaved in image lines, or how samples from different
  band_storage_type~bandstortype~bands are arranged sequentially. Example values:
  band_storage_type~bandstortype~BAND SEQUENTIAL, SAMPLE INTERLEAVED, LINE INTERLEAVED.
  bandwidth~bandwidth~The bandwidth element provides a measure of the spectral
  bandwidth~bandwidth~width of a filter or channel.  For a root-mean-square
  bandwidth~bandwidth~detector this is the effective bandwidth of the filter
  bandwidth~bandwidth~i.e., the full width of an ideal square filter having a flat
  bandwidth~bandwidth~response over the bandwidth and zero response elsewhere.
  b_axis_radius~baxisradius~The b_axis_radius element provides the value of the intermediate axis
  b_axis_radius~baxisradius~of the ellipsoid that defines the approximate shape of a target body.
  b_axis_radius~baxisradius~'B' is usually in the equatorial plane.
  b1950_declination~bdeclin~ The B1950_declination element provides the declination of
  b1950_declination~bdeclin~a star or other object using the B1950 coordinate frame
  b1950_declination~bdeclin~rather than the J2000 frame.
  body_pole_clock_angle~bdypolclkang~The body_pole_clock_angle element specifies the direction of the
  body_pole_clock_angle~bdypolclkang~target body's rotation axis in an image. It is measured from the
  body_pole_clock_angle~bdypolclkang~'upward' direction, clockwise to the direction of the northern
  body_pole_clock_angle~bdypolclkang~rotational pole as projected into the image plane, assuming the image
  body_pole_clock_angle~bdypolclkang~is displayed as defined by the SAMPLE_DISPLAY_DIRECTION and
  body_pole_clock_angle~bdypolclkang~LINE_DISPLAY_DIRECTION elements.
  body_pole_clock_angle~bdypolclkang~ 
  body_pole_clock_angle~bdypolclkang~Note: In some cases, knowledge of the inertial orientation of the
  body_pole_clock_angle~bdypolclkang~rotational axis improves with time. This keyword necessarily reflects
  body_pole_clock_angle~bdypolclkang~the state of knowledge of the rotational axis at the time of
  body_pole_clock_angle~bdypolclkang~preparing the data product as given by the POLE_DECLINATION and
  body_pole_clock_angle~bdypolclkang~POLE_RIGHT_ASCENSION elements.
  billing_address_line~billaddrline~This column stores text for the billing address.  The text
  billing_address_line~billaddrline~may consist of several lines containing up to sixty (60)
  billing_address_line~billaddrline~characters each.
  bin_number~binnum~The bin_number element provides the number of a bin.
  bin_number~binnum~Bin_number values are dependent upon the associated binning
  bin_number~binnum~scheme.
  bin_points~binpoints~The bin_points element identifies the number of data
  bin_points~binpoints~samples which fall in a given bin.
  bin_points~binpoints~Note:  For radiometry applications, the bin_points value is
  bin_points~binpoints~the number of points from a given sequence that are located
  bin_points~binpoints~in the given bin.
  bit_data_type~bitdatatype~The bit_data_type element provides the data type for data
  bit_data_type~bitdatatype~values stored in the BIT_COLUMN or BIT_ELEMENT object.
  bit_data_type~bitdatatype~See also: data_type.
  bit_mask~bitmask~The bit_mask element is a series of binary digits identi-
  bit_mask~bitmask~fying the active bits in a value.  This is determined by
  bit_mask~bitmask~applying a bitwise AND (&) operation between the value and
  bit_mask~bitmask~the bit_mask.
  bit_mask~bitmask~For example, specifiying a BIT_MASK = 2#11110000# within a 1
  bit_mask~bitmask~byte unsigned integer COLUMN or ELEMENT object would identif
  bit_mask~bitmask~only the high-order 4 bits to be used for the value of the
  bit_mask~bitmask~object.  If other data elements are included in the object
  bit_mask~bitmask~description that may be dependent on a bit_mask operation
  bit_mask~bitmask~(e.g. DERIVED_MINIMUM, DERIVED_MAXIMUM, INVALID), the rule
  bit_mask~bitmask~is to apply the bit_mask first, and then apply or interpret
  bit_mask~bitmask~the data with the other values.  Byte swapping, if required,
  bit_mask~bitmask~should be performed prior to applying the bit_mask.
  bits~bits~The bits element identifies the count of bits, or units of
  bits~bits~binary information, in a data representation.
  blemish_file_name~blmshfilenm~The blemish_file_name element indicates the file that
  blemish_file_name~blmshfilenm~provides corrections for blemishes (reseaus, dust spots,
  blemish_file_name~blmshfilenm~etc.) that affect the response of the sensor at specific
  blemish_file_name~blmshfilenm~locations.  The blemish file is selected based on camera,
  blemish_file_name~blmshfilenm~filter, gain-state, camera mode, and time.
  blemish_protection_flag~blmshprotflg~The BLEMISH_PROTECTION_FLAG element indicates whether the
  blemish_protection_flag~blmshprotflg~blemish protection was on or off.
  bl_name~blname~The bl_name element is a unique 12-character name for
  bl_name~blname~elements used in any PDS data base table.  These are only
  bl_name~blname~elements used in the data base.
  block_bytes~blockbytes~The block_bytes element identifies the number of bytes per
  block_bytes~blockbytes~physical block used to record data files on magnetic tapes.
  block_bytes~blockbytes~Note:  In the PDS, for portability the block_bytes element
  block_bytes~blockbytes~should be limited to a maximum value of 32767 for a tape
  block_bytes~blockbytes~volume.
  bl_sql_format~blsqlfmt~This is the format required to generate CREATE statements
  bl_sql_format~blsqlfmt~in IDM SQL.
  band_bin_center~bndbinctr~The band_bin_center element of a Standard ISIS Qube
  band_bin_center~bndbinctr~provides the sequence of wavelengths describing the center
  band_bin_center~bndbinctr~of each 'bin' along the band axis of the qube.  When
  band_bin_center~bndbinctr~describing data from a spectrometer, each wavelength
  band_bin_center~bndbinctr~corresponds to the peak of the response function for a
  band_bin_center~bndbinctr~particular detector and/or grating position.
  bond_albedo~bondalb~The bond_albedo element provides the value of the ratio of
  bond_albedo~bondalb~the total amount of energy reflected from a body to the
  bond_albedo~bondalb~total amount of energy (sunlight) incident on the body.
  brightness_temperature~brghtnsstemp~ The brightness_temperature element provides the value of
  brightness_temperature~brghtnsstemp~the planet brightness temperature, derived from the
  brightness_temperature~brghtnsstemp~planet_reading_system_temp after correcting for antenna
  brightness_temperature~brghtnsstemp~efficiency and side-lobe gain.
  b1950_ring_longitude~bringlong~ The B1950_ring_longitude element specifies the inertial
  b1950_ring_longitude~bringlong~longitude of a ring feature relative to the B1950 prime
  b1950_ring_longitude~bringlong~meridian, rather than to the J2000 prime meridian.  The
  b1950_ring_longitude~bringlong~prime meridian is the ascending node of the planet's
  b1950_ring_longitude~bringlong~invariable plane on the Earth's mean equator of B1950.
  b1950_ring_longitude~bringlong~Longitudes are measured in the direction of orbital motion
  b1950_ring_longitude~bringlong~along the planet's invariable plane to the ring's ascending
  b1950_ring_longitude~bringlong~node, and thence along the ring plane.
  brightness_temperature_id~britetempid~The brightness_temperature_id element provides
  brightness_temperature_id~britetempid~the designation of the spectral band for which particular
  brightness_temperature_id~britetempid~brightness temperature measurements were made.
  brightness_temperature_id~britetempid~In the spectral_contrast_range group, the
  brightness_temperature_id~britetempid~brightness_temperature_id designator may refer
  brightness_temperature_id~britetempid~to a planetary temperature model.
  browse_flag~browseflag~The browse_flag element is a yes-or-no flag which indicates
  browse_flag~browseflag~whether browse_format data are available for a given sample
  browse_flag~browseflag~interval.
  b1950_right_ascension~brtascen~ The B1950_right_ascension element provides the right
  b1950_right_ascension~brtascen~ascension of a star or other object using the B1950
  b1950_right_ascension~brtascen~coordinate frame rather than the J2000 frame.
  build_date~builddate~The build_date element provides the date associated with the
  build_date~builddate~completion of the manufacture of an instrument. This date
  build_date~builddate~should reflect the level of technology used in the
  build_date~builddate~construction of the instrument.
  build_date~builddate~Formation rule:  YYYY-MM-DDThh:mm:ss[.fff]
  bytes~bytes~The bytes element indicates the number of bytes allocated
  bytes~bytes~for a particular data representation.
  c_axis_radius~caxisradius~The c_axis_radius element provides the value of the semiminor axis of
  c_axis_radius~caxisradius~the ellipsoid that defines the approximate shape of a target body.  'C'
  c_axis_radius~caxisradius~is normal to the plane defined by 'A' and 'B'.
  ccsds_spacecraft_number~ccsdsscnum~The ccsds_spacecraft_number element provides the number
  ccsds_spacecraft_number~ccsdsscnum~assigned by the CCSDS to a given spacecraft.
  ccsds_spacecraft_number~ccsdsscnum~Note: Due to conflicting numbering schemes between the DSN
  ccsds_spacecraft_number~ccsdsscnum~and the CCSDS it is recommended that this element not be
  ccsds_spacecraft_number~ccsdsscnum~used in AMMOS catalog headers.
  celestial_north_clock_angle~celesnclkang~The celestial_north_clock_angle element specifies the direction of
  celestial_north_clock_angle~celesnclkang~celestial north at the center of an image. It is measured from the
  celestial_north_clock_angle~celesnclkang~'upward' direction, clockwise to the direction toward celestial north
  celestial_north_clock_angle~celesnclkang~(declination = +90 degrees), when the image is displayed as defined by
  celestial_north_clock_angle~celesnclkang~the SAMPLE_DISPLAY_DIRECTION and LINE_DISPLAY_DIRECTION elements. The
  celestial_north_clock_angle~celesnclkang~epoch of the celestial coordinate system is J2000 unless otherwise
  celestial_north_clock_angle~celesnclkang~indicated.
  celestial_north_clock_angle~celesnclkang~ 
  celestial_north_clock_angle~celesnclkang~Note: This element bears a simple relationship to the value of
  celestial_north_clock_angle~celesnclkang~      TWIST_ANGLE:
  celestial_north_clock_angle~celesnclkang~ 
  celestial_north_clock_angle~celesnclkang~      When TWIST_ANGLE_TYPE = DEFAULT,
  celestial_north_clock_angle~celesnclkang~      CELESTIAL_NORTH_CLOCK_ANGLE = (180 - TWIST_ANGLE) mod 360;
  celestial_north_clock_angle~celesnclkang~      when TWIST_ANGLE_TYPE = GALILEO,
  celestial_north_clock_angle~celesnclkang~      CELESTIAL_NORTH_CLOCK_ANGLE = (270 - TWIST_ANGLE) mod 360.
  celestial_north_clock_angle~celesnclkang~ 
  celestial_north_clock_angle~celesnclkang~Note: For images pointed near either pole, the value varies
  celestial_north_clock_angle~celesnclkang~      significantly across the image; in these cases, the element
  celestial_north_clock_angle~celesnclkang~      is very sensitive to the accuracy of the pointing information.
  center_elevation~centerelev~The CENTER_ELEVATION is the angular elevation from the azimuthal
  center_elevation~centerelev~reference plane of the center point of an image or observation.
  center_elevation~centerelev~Elevation is measured in a spherical coordinate system.  The zero
  center_elevation~centerelev~elevation point lies in the azimuthal reference plane and positive
  center_elevation~centerelev~elevation is measured toward the positive direction of the principal
  center_elevation~centerelev~axis of the spherical coordinate system.
  center_latitude~centerlat~The center_latitude element provides a reference latitude
  center_latitude~centerlat~for certain map projections.  For example, in an
  center_latitude~centerlat~Orthographic projection, the center_latitude along with the
  center_latitude~centerlat~center_longitude defines the point or tangency between the
  center_latitude~centerlat~sphere of the planet and the plane of the projection.  The
  center_latitude~centerlat~map_scale (or map_resolution) is typically defined at the
  center_latitude~centerlat~center_latitude and center_longitude. In unprojected images,
  center_latitude~centerlat~center_latitude represents the latitude at the center of the
  center_latitude~centerlat~image frame.
  center_longitude~centerlon~The center_longitude element provides a reference longitude
  center_longitude~centerlon~for certain map projections.  For example, in an
  center_longitude~centerlon~Orthographic projection, the center_longitude along with
  center_longitude~centerlon~the center_latitude defines the point or tangency between
  center_longitude~centerlon~the sphere of the planet and the plane of the projection.
  center_longitude~centerlon~The map_scale (or map_resolution) is typically defined at
  center_longitude~centerlon~the center_latitude and center_longitude.  In unprojected
  center_longitude~centerlon~images, center_longitude represents the longitude at the
  center_longitude~centerlon~center of the image frame.
  change_date~changedate~The change_date data element provides the date on which
  change_date~changedate~a record or object was altered.
  change_date~changedate~Note:  In the PDS, the change_date element indicates the
  change_date~changedate~date when a record in the data dictionary was updated per
  change_date~changedate~a change request.
  checksum~checksum~The checksum element represents an unsigned 32-bit sum of
  checksum~checksum~all data values in a data object.
  channel_geometric_factor~chnlgeomfact~The channel_geometric_factor element provides the value of G
  channel_geometric_factor~chnlgeomfact~in the formula:  j = R/((E2-E1)G), where (E2-E1) is the
  channel_geometric_factor~chnlgeomfact~energy range accepted by the channel.  This formula allows
  channel_geometric_factor~chnlgeomfact~conversion of a particle detector channel count rate, R,
  channel_geometric_factor~chnlgeomfact~into a differential intensity, j
  channel_geometric_factor~chnlgeomfact~(counts/time.area.steradians.energy). G has dimensions of
  channel_geometric_factor~chnlgeomfact~area.steradians, and here includes the efficiency of
  channel_geometric_factor~chnlgeomfact~particle counting by the relevant detector.
  channel_group_name~chnlgrpname~The channel_group_name element provides the name given to a
  channel_group_name~chnlgrpname~group of particle detector channels that are activated or
  channel_group_name~chnlgrpname~deactivated as a group in any instrument mode configuration.
  channel_group_name~chnlgrpname~The grouping is not tied to the physical groupings of
  channel_group_name~chnlgrpname~detectors, and more than one group can be activated during
  channel_group_name~chnlgrpname~any one mode.
  channel_id~chnlid~The channel_id element identifies the
  channel_id~chnlid~instrument channel through which data were obtained.
  channel_id~chnlid~This may refer to a spectral band or to a detector and
  channel_id~chnlid~filter combination.
  channel_integration_duration~chnlintgdur~The channel_integration_duration element provides the length
  channel_integration_duration~chnlintgdur~of time during which charge from incoming particles is
  channel_integration_duration~chnlintgdur~counted by the detectors for each channel in a given mode.
  channels~chnls~The channels element provides the number of channels in a
  channels~chnls~particular instrument, section of an instrument, or channel
  channels~chnls~group.
  classification_id~classid~The classification_id data element supplies an identifier
  classification_id~classid~that is used to link an abbreviated term to a full,
  classification_id~classid~spelled-out name that would be displayed in a data
  classification_id~classid~dictionary.  In the PDS, classification_id is a general
  classification_id~classid~term that embraces both general_classification_type and
  classification_id~classid~system_classification_id.
  clustered_key~clustkey~The clustered_key element indicates whether a column in a
  clustered_key~clustkey~table is part of a unique clustered index.  This index
  clustered_key~clustkey~determines uniqueness in the table and the sorting order of
  clustered_key~clustkey~the data.
  cmprs_quantz_tbl_id~cmprsqntztbl~The cmprs_quantz_tbl_id (compression quantization table identifier)
  cmprs_quantz_tbl_id~cmprsqntztbl~element provides the Integer Cosine Transform 8X8 quantization matrix
  cmprs_quantz_tbl_id~cmprsqntztbl~identifier. For Galileo the valid values are: UNIFORM, VG2, VG3, UNK.
  center_ring_radius~cnterringrad~The CENTER_RING_RADIUS element applies to images of
  center_ring_radius~cnterringrad~planetary rings only.  It is the radius of the ring element
  center_ring_radius~cnterringrad~that passes through the center of the image. The ring plane
  center_ring_radius~cnterringrad~is an imaginary plane that divides the planet in half at
  center_ring_radius~cnterringrad~the equator and extends infinitely outward into space.  The
  center_ring_radius~cnterringrad~center of the image is a point on the ring plane, even
  center_ring_radius~cnterringrad~though there may be no actual ring material there.
  central_body_distance~cntrlbdydist~The CENTRAL_BODY_DISTANCE element provides the distance
  central_body_distance~cntrlbdydist~from the spacecraft to the center of a primary target.
  cognizant_full_name~cogfullname~The cognizant_full_name element provides the full name of
  cognizant_full_name~cogfullname~the individual who has either developed the processing
  cognizant_full_name~cogfullname~software or has current knowledge of its use.  See also:
  cognizant_full_name~cogfullname~full_name.
  column_description~cold~This is the description of an element in the data base.
  column_description~cold~There should be a description for every element.
  column_name~colname~This is the < or = to 30 character dictionary name used in
  column_name~colname~documentation and template objects.  They are unique and
  column_name~colname~are an alias to the BLNAMEs.
  column_number~colnum~The column_number element identifies the location of a
  column_number~colnum~specific column within a larger data object, such as a
  column_number~colnum~table.  For tables consisting of rows (i = 1, N) and
  column_number~colnum~columns (j = 1,M), the column_number is the j-th index of
  column_number~colnum~any row.
  column_order~colord~The column_order element represents the sequence number of
  column_order~colord~columns within a table.  The sequence begins with 1 for the
  column_order~colord~first column and is incremented by 1 for each subsequent
  column_order~colord~column in the table.
  columns~columns~The columns element represents the number of columns in
  columns~columns~each row of a data object.
  columns~columns~Note:  In the PDS, the term 'columns' is synonymous with
  columns~columns~'fields'.
  column_value~colval~The column value contains a standard ASCII value used in
  column_value~colval~domain validation.  An element may have many possible
  column_value~colval~values that are valid.
  column_value_node_id~colvalnodeid~The column_value_node_id element indicates a list of one or
  column_value_node_id~colvalnodeid~more science nodes for which a standard value is
  column_value_node_id~colvalnodeid~available.  The list of science nodes is represented as a
  column_value_node_id~colvalnodeid~concatenation of single-character identifiers in alphabetic
  column_value_node_id~colvalnodeid~order.  Allowable identifiers include:  F (Fields and
  column_value_node_id~colvalnodeid~Particles), I (Images), N (NAIF), U (unknown - valid only if
  column_value_node_id~colvalnodeid~the column_value_type element is 'P' for a possible value
  column_value_node_id~colvalnodeid~that was provided but the provider is unknown), A
  column_value_node_id~colvalnodeid~(Atmospheres), P (Planetary Rings), R (Radiometry), S
  column_value_node_id~colvalnodeid~(Spectroscopy).
  column_value_type~colvaltype~The column_value_type element indicates whether a standard
  column_value_type~colvaltype~value is considered to be an available value (the value
  column_value_type~colvaltype~currently exists in the PDS catalog) or a possible value
  column_value_type~colvaltype~(the value does not currently exist in the PDS catalog but
  column_value_type~colvaltype~may exist in the future).  Example values:  A (available
  column_value_type~colvaltype~value) or P (possible value).
  comment_date~commentdate~The comment_date element indicates the date when a user's
  comment_date~commentdate~comment information is inserted into the data base.
  comment_id~commentid~The comment_id element is a unique key used to identify
  comment_id~commentid~a particular set of user comments.
  comment_text~commenttext~The comment_text indicates a line of text in a user's
  comment_text~commenttext~comments.
  compression_type~comprtype~ The compression_type element indicates the type of compression/
  compression_type~comprtype~encoding used for data that was subsequently decompressed/unencoded
  compression_type~comprtype~before storage.
  committee_member_full_name~comtfullname~The committee_member_full_name element identifies a peer
  committee_member_full_name~comtfullname~review committee member.  The member does not necessarily
  committee_member_full_name~comtfullname~have a PDS userid.  See also:  full_name.
  cone_angle~coneang~The cone_angle element provides the value of the angle
  cone_angle~coneang~between the primary spacecraft axis and the pointing
  cone_angle~coneang~direction of the instrument.
  cone_offset_angle~coneoffang~The cone_offset_angle element provides the elevation angle
  cone_offset_angle~coneoffang~(in the cone direction) between the pointing direction along
  cone_offset_angle~coneoffang~which an instrument is mounted and the cone axis of the
  cone_offset_angle~coneoffang~spacecraft.
  cone_offset_angle~coneoffang~See also cross_cone_offset_angle, twist_offset_angle, and
  cone_offset_angle~coneoffang~cone_angle.
  confidence_level_note~conflvlnote~The confidence_level_note element is a text field which
  confidence_level_note~conflvlnote~characterizes the reliability of data within a data set or
  confidence_level_note~conflvlnote~the reliability of a particular programming algorithm or
  confidence_level_note~conflvlnote~software component.  Essentially, this note discusses the
  confidence_level_note~conflvlnote~level of confidence in the accuracy of the data or in the
  confidence_level_note~conflvlnote~ability of the software to produce accurate results.
  contamination_desc~contamd~The contamination_desc element describes the type of
  contamination_desc~contamd~data contamination which is associated with a particular
  contamination_desc~contamd~contamination_id value.
  contamination_desc~contamd~The various values of contamination_id and
  contamination_desc~contamd~contamination_desc are instrument dependent.
  contamination_id~contamid~The contamination_id element identifies a type
  contamination_id~contamid~of contamination which affected an instrument during a
  contamination_id~contamid~particular period of data acquisition.
  contamination_id~contamid~The associated contamination_desc element describes
  contamination_id~contamid~the type of contamination.
  coordinate_system_type~coordsystype~There are three basic types of coordinate systems: body-fixed rotating,
  coordinate_system_type~coordsystype~body-fixed non-rotating and inertial. A body-fixed coordinate system is one
  coordinate_system_type~coordsystype~associated with a body (e.g., planetary body or satellite).  In contrast to
  coordinate_system_type~coordsystype~inertial coordinate systems, a body-fixed coordinate system is centered
  coordinate_system_type~coordsystype~on the body and rotates with the body (unless it is a non-rotating type).
  coordinate_system_type~coordsystype~For the inertial coordinate system type, the coordinate system is fixed
  coordinate_system_type~coordsystype~at some point in space.
  coordinate_system_type~coordsystype~ 
  coordinate_system_type~coordsystype~Note:  If this data element is not present in the PDS Image Map
  coordinate_system_type~coordsystype~Projection Object (for pre-V3.1 PDS Standards), the default coordinate
  coordinate_system_type~coordsystype~system is assumed to be body-fixed rotating Planetographic.
  copies~copies~The copies element provides the inventory software with the
  copies~copies~number of copies of an order that a node is willing to ship
  copies~copies~using a particular order.
  core_base~corebase~The core_base element, together with the core_multiplier
  core_base~corebase~element, describes the scaling performed on a 'true' data
  core_base~corebase~value to compute the value stored in the data object.  It
  core_base~corebase~also defines the method for recovering the 'true' value:
  core_base~corebase~'true'_value =  base + multiplier * stored_value  In ISIS
  core_base~corebase~practice, the value of core_base is 0.0 for real core
  core_base~corebase~items, since scaling is not usually necessary for floating
  core_base~corebase~point data.  NOTE: Base and multiplier correspond directly
  core_base~corebase~to the PDS standard data elements OFFSET and
  core_base~corebase~SCALING_FACTOR.
  core_high_instr_saturation~corehinstsat~The core_high_instr_saturation element identifies a special
  core_high_instr_saturation~corehinstsat~value whose presence indicates the measuring instrument was
  core_high_instr_saturation~corehinstsat~saturated at the high end.  This value must be
  core_high_instr_saturation~corehinstsat~algebraically less than the value of the core_valid_minimum
  core_high_instr_saturation~corehinstsat~element. For Standard ISIS Qubes, a value has been chosen
  core_high_instr_saturation~corehinstsat~by ISIS convention. The general data type of this element
  core_high_instr_saturation~corehinstsat~is determined by the core_item_type element.  If the latter
  core_high_instr_saturation~corehinstsat~is integer or unsigned integer, the general data type is
  core_high_instr_saturation~corehinstsat~integer.  If core_item_type is real, the value will be
  core_high_instr_saturation~corehinstsat~hardware- specific (or rather
  core_high_instr_saturation~corehinstsat~floating-point-representation-specific) so that it may be
  core_high_instr_saturation~corehinstsat~specified exactly near the bottom of the allowable range of
  core_high_instr_saturation~corehinstsat~values. A non-decimal (hexadecimal) general data type is
  core_high_instr_saturation~corehinstsat~used for this purpose; e.g. 16#FFFCFFFF# for a VAX.
  core_high_repr_saturation~corehreprsat~The core_high_repr_saturation element identifies a special
  core_high_repr_saturation~corehreprsat~value whose presence indicates the true value cannot be
  core_high_repr_saturation~corehreprsat~represented in the chosen data type and length -- in this
  core_high_repr_saturation~corehreprsat~case being above the allowable range -- which may happen
  core_high_repr_saturation~corehreprsat~during conversion from another data type.  This value must
  core_high_repr_saturation~corehreprsat~be algebraically less than the value of the
  core_high_repr_saturation~corehreprsat~core_valid_minimum element. For Standard ISIS Qubes, a
  core_high_repr_saturation~corehreprsat~value has been chosen by ISIS convention. The general data
  core_high_repr_saturation~corehreprsat~type of this element is determined by the core_item_type
  core_high_repr_saturation~corehreprsat~element.  If the latter is integer or unsigned integer, the
  core_high_repr_saturation~corehreprsat~general data type is integer.  If core_item_type is real,
  core_high_repr_saturation~corehreprsat~the value will be hardware- specific (or rather
  core_high_repr_saturation~corehreprsat~floating-point-representation-specific) so that it may be
  core_high_repr_saturation~corehreprsat~specified exactly near the bottom of the allowable range of
  core_high_repr_saturation~corehreprsat~values. A non-decimal (hexadecimal) general data type is
  core_high_repr_saturation~corehreprsat~used for this purpose; e.g. 16#FFFBFFFF# for a VAX.
  core_items~coreitems~The core_items element provides the sequence of dimensions
  core_items~coreitems~of the core of a qube data object.  The size of the most
  core_items~coreitems~frequently varying axis is given first.  The number of
  core_items~coreitems~items specified must be equal to the value of the axes
  core_items~coreitems~element and the items must be listed in storage order.
  core_items~coreitems~Each dimension is measured in units of the core_item_bytes
  core_items~coreitems~element.
  core_item_type~coreitemtype~The core_item_type element identifies the data type of a
  core_item_type~coreitemtype~core data value.  A hardware-specific prefix is used on
  core_item_type~coreitemtype~this element for qubes whose core contains items of more
  core_item_type~coreitemtype~than one byte. The current VAX/VMS implementation of ISIS
  core_item_type~coreitemtype~allows three item types, additional types will be added for
  core_item_type~coreitemtype~a forthcoming Sun/Unix implementation.
  core_item_bytes~coreitmbytes~The core_item_bytes element identifies the size in bytes of
  core_item_bytes~coreitmbytes~a core data value.  It is the unit of the dimensions
  core_item_bytes~coreitmbytes~specified by the core_items element.
  core_low_instr_saturation~corelinstsat~The core_low_instr_saturation element identifies a special
  core_low_instr_saturation~corelinstsat~value whose presence indicates the measuring instrument was
  core_low_instr_saturation~corelinstsat~saturated at the low end.  This value must be algebraically
  core_low_instr_saturation~corelinstsat~less than the value of the core_valid_minimum element. For
  core_low_instr_saturation~corelinstsat~Standard ISIS Qubes, a value has been chosen by ISIS
  core_low_instr_saturation~corelinstsat~convention. The general data type of this element is
  core_low_instr_saturation~corelinstsat~determined by the core_item_type element.  If the latter is
  core_low_instr_saturation~corelinstsat~integer or unsigned integer, the general data type is
  core_low_instr_saturation~corelinstsat~integer.  If core_item_type is real, the value will be
  core_low_instr_saturation~corelinstsat~hardware- specific (or rather
  core_low_instr_saturation~corelinstsat~floating-point-representation-specific) so that it may be
  core_low_instr_saturation~corelinstsat~specified exactly near the bottom of the allowable range of
  core_low_instr_saturation~corelinstsat~values. A non-decimal (hexadecimal) general data type is
  core_low_instr_saturation~corelinstsat~used for this purpose; e.g. 16#FFFDFFFF# for a VAX.
  core_low_repr_saturation~corelreprsat~The core_low_repr_saturation element identifies a special
  core_low_repr_saturation~corelreprsat~value whose presence indicates the true value cannot be
  core_low_repr_saturation~corelreprsat~represented in the chosen data type and length -- in this
  core_low_repr_saturation~corelreprsat~case being below the allowable range -- which may happen
  core_low_repr_saturation~corelreprsat~during conversion from another data type.  This value must
  core_low_repr_saturation~corelreprsat~be algebraically less than the value of the
  core_low_repr_saturation~corelreprsat~core_valid_minimum element. For Standard ISIS Qubes, a
  core_low_repr_saturation~corelreprsat~value has been chosen by ISIS convention. The general data
  core_low_repr_saturation~corelreprsat~type of this element is determined by the core_item_type
  core_low_repr_saturation~corelreprsat~element.  If the latter is integer or unsigned integer, the
  core_low_repr_saturation~corelreprsat~general data type is integer.  If core_item_type is real,
  core_low_repr_saturation~corelreprsat~the value will be hardware- specific (or rather
  core_low_repr_saturation~corelreprsat~floating-point-representation-specific) so that it may be
  core_low_repr_saturation~corelreprsat~specified exactly near the bottom of the allowable range of
  core_low_repr_saturation~corelreprsat~values. A non-decimal (hexadecimal) general data type is
  core_low_repr_saturation~corelreprsat~used for this purpose; e.g. 16#FFFEFFFF# for a VAX.
  core_multiplier~coremult~The core_multiplier element, together with the core_base
  core_multiplier~coremult~element, describes the scaling performed on a 'true' data
  core_multiplier~coremult~value to compute the value stored in the data object.  It
  core_multiplier~coremult~also defines the method for recovering the 'true' value:
  core_multiplier~coremult~'true'_value =  base + multiplier * stored_value
  core_multiplier~coremult~In ISIS practice, the value of core_multiplier is 1.0 for
  core_multiplier~coremult~real core items, since scaling is not usually necessary
  core_multiplier~coremult~for floating point data.
  core_multiplier~coremult~NOTE: In the PDS, base and multiplier correspond directly
  core_multiplier~coremult~to the data elements OFFSET and SCALING_FACTOR.
  core_name~corename~The core_name element identifies the scientific meaning of
  core_name~corename~the values in the core of a qube data object; e.g.
  core_name~corename~SPECTRAL_RADIANCE or RAW_DATA_NUMBER.
  core_null~corenull~The core_null element identifies a special value whose
  core_null~corenull~presence indicates missing data.  This value must be
  core_null~corenull~algebraically less than the value of the core_valid_minimum
  core_null~corenull~element. For Standard ISIS Qubes, the null value is chosen
  core_null~corenull~to be the algebraically smallest value allowed by the
  core_null~corenull~core_item_type and core_item_bytes elements. The general
  core_null~corenull~data type of this element is determined by the
  core_null~corenull~core_item_type element.  If the latter is integer or
  core_null~corenull~unsigned integer, the general data type is integer.  If
  core_null~corenull~core_item_type is real, the value will be hardware-
  core_null~corenull~specific (or rather floating-point-representation-specific)
  core_null~corenull~so that it may be specified exactly at the bottom of the
  core_null~corenull~allowable range of values. A non-decimal (hexadecimal)
  core_null~corenull~general data type is used for this purpose; e.g.
  core_null~corenull~16#FFFFFFFF# for a VAX.
  core_null~corenull~Note: In the PDS, the CORE_NULL element
  core_null~corenull~corresponds directly to the data element MISSING.
  core_unit~coreunit~The core_unit element identifies the scientific unit of the
  core_unit~coreunit~values in the core of a qube data object; e.g.
  core_unit~coreunit~'WATT*M**-2*SR**-1*uM**-1' (for spectral radiance) or
  core_unit~coreunit~'DIMENSIONLESS' (for raw data number).
  core_valid_minimum~corevalidmin~The core_valid_minimum element identifies the minimum valid
  core_valid_minimum~corevalidmin~core value.  Values algebraically less than this value are
  core_valid_minimum~corevalidmin~reserved for special values indicating missing data or
  core_valid_minimum~corevalidmin~various types of invalid data.  The general data type of
  core_valid_minimum~corevalidmin~this element is determined by the core_item_type element.
  core_valid_minimum~corevalidmin~If the latter is integer or unsigned integer, the general
  core_valid_minimum~corevalidmin~data type is integer.  If core_item_type is real, the value
  core_valid_minimum~corevalidmin~will be hardware-specific (or rather
  core_valid_minimum~corevalidmin~floating-point-representation-specific) so that it may be
  core_valid_minimum~corevalidmin~specified exactly near the bottom of the allowable range of
  core_valid_minimum~corevalidmin~values.  A non-decimal (hexadecimal) general data type is
  core_valid_minimum~corevalidmin~used for this purpose; e.g. 16#FFEFFFFF# for a VAX.
  computer_vendor_name~cpuvendname~The computer_vendor_name element identifies the
  computer_vendor_name~cpuvendname~manufacturer of the computer hardware on which the
  computer_vendor_name~cpuvendname~processing software operates.
  coordinate_system_center_name~crdsysctrnm~The coordinate_system_center_name element identifies a
  coordinate_system_center_name~crdsysctrnm~named target, such as the Sun, a planet, a satellite or a
  coordinate_system_center_name~crdsysctrnm~spacecraft, as being the location of the center of the
  coordinate_system_center_name~crdsysctrnm~reference coordinate system.
  coordinate_system_center_name~crdsysctrnm~The coordinate_system_center_name element can also be used
  coordinate_system_center_name~crdsysctrnm~to identify a barycenter used for a SPICE s_ or p_kernel.
  coordinate_system_desc~crdsysd~The coordinate_system_desc element describes a named
  coordinate_system_desc~crdsysd~reference coordinate system in terms of the definitions of
  coordinate_system_desc~crdsysd~the axes and the `handedness' of the system.  It also
  coordinate_system_desc~crdsysd~provides other necessary descriptive information, such as
  coordinate_system_desc~crdsysd~the rotation period for rotating coordinate systems.
  coordinate_system_ref_epoch~crdsysepoch~The coordinate_system_reference_epoch element provides the
  coordinate_system_ref_epoch~crdsysepoch~Julian date selected as the reference time for a geometric
  coordinate_system_ref_epoch~crdsysepoch~quantity that changes over time.
  coordinate_system_ref_epoch~crdsysepoch~For example, the location of a prime meridian may have a
  coordinate_system_ref_epoch~crdsysepoch~fixed value at a reference epoch, with additional
  coordinate_system_ref_epoch~crdsysepoch~time_dependent terms added.
  coordinate_system_id~crdsysid~The coordinate_system_id element provides an
  coordinate_system_id~crdsysid~alphanumeric identifier for the referenced coordinate
  coordinate_system_id~crdsysid~system.
  coordinate_system_name~crdsysname~The coordinate_system_name element provides the full name
  coordinate_system_name~crdsysname~of the coordinate system to which the state vectors are referenced.
  coordinate_system_name~crdsysname~PDS has currently defined body-fixed rotating coordinate systems.
  coordinate_system_name~crdsysname~ 
  coordinate_system_name~crdsysname~The Planetocentric system has an origin at the center of mass of the body.
  coordinate_system_name~crdsysname~The planetocentric latitude is the angle between the equatorial plane
  coordinate_system_name~crdsysname~and a vector connecting the point of interest and the origin of the
  coordinate_system_name~crdsysname~coordinate system.  Latitudes are defined to be positive in the northern
  coordinate_system_name~crdsysname~hemisphere of the body, where north is in the direction of Earth's
  coordinate_system_name~crdsysname~angular momentum vector, i.e., pointing toward the hemisphere north of
  coordinate_system_name~crdsysname~the solar system invariant plane.  Longitudes increase toward the east,
  coordinate_system_name~crdsysname~making the Planetocentric system right-handed.
  coordinate_system_name~crdsysname~The Planetographic system has an origin at the center of mass of the body.
  coordinate_system_name~crdsysname~The planetographic latitude is the angle between the equatorial plane
  coordinate_system_name~crdsysname~and a vector through the point of interest, where the vector is normal
  coordinate_system_name~crdsysname~to a biaxial ellipsoid reference surface.  Planetographic longitude is
  coordinate_system_name~crdsysname~defined to increase with time to an observer fixed in space above the
  coordinate_system_name~crdsysname~object of interest.  Thus, for prograde rotators (rotating counter
  coordinate_system_name~crdsysname~clockwise as seen from a fixed observer located in the hemisphere to the
  coordinate_system_name~crdsysname~north of the solar system invariant plane), planetographic longitude
  coordinate_system_name~crdsysname~increases toward the west.  For a retrograde rotator, planetographic
  coordinate_system_name~crdsysname~longitude increases toward the east.
  coordinate_system_name~crdsysname~ 
  coordinate_system_name~crdsysname~Note:  If this data element is not present in the PDS Image Map
  coordinate_system_name~crdsysname~Projection Object (for pre-V3.1 PDS Standards), the default coordinate
  coordinate_system_name~crdsysname~system is assumed to body-fixed rotating Planetographic.
  create_date~createdate~This date is in YYYYMMDD format and is used for storing the
  create_date~createdate~create date of a table or query on the data base.
  criticality~critical~This column stores the criticality code for an attribute.
  criticality~critical~A criticality id is assigned to each table's attribute so
  criticality~critical~the criticality can be dependent on the usage within a
  criticality~critical~table.  This criticality is used by the catalog bulk load
  criticality~critical~software during a template object validation step.
  cross_cone_angle~crsconeang~The cross_cone_angle element provides the value of an
  cross_cone_angle~crsconeang~azimuthal measurement orthogonal to cone_angle.
  cross_cone_offset_angle~crsconoffang~The cross_cone_offset_angle element provides the azimuthal angle
  cross_cone_offset_angle~crsconoffang~(in the cross-cone direction) between the pointing direction
  cross_cone_offset_angle~crsconoffang~along which an instrument is mounted and the cross_cone axis
  cross_cone_offset_angle~crsconoffang~of the spacecraft.
  cross_cone_offset_angle~crsconoffang~See also cone_offset_angle, twist_offset_angle, and
  cross_cone_offset_angle~crsconoffang~cross_cone_angle.
  cryocooler_duration~cryocooldur~The cryocooler_duration element provides the length of time
  cryocooler_duration~cryocooldur~the cryocooler was on when an observation was made.
  cryocooler_temperature~cryocooltemp~The cryocooler_temperature element provides the temperature
  cryocooler_temperature~cryocooltemp~of the cryocooler at the time an observation was made.
  center_filter_wavelength~ctrfiltwave~The center_filter_wavelength element provides the mid_point
  center_filter_wavelength~ctrfiltwave~wavelength value between the minimum and maximum instrument
  center_filter_wavelength~ctrfiltwave~filter wavelength values.
  center_frequency~ctrfreq~The center_frequency element provides the frequency of
  center_frequency~ctrfreq~maximum transmittance of a filter or the frequency that
  center_frequency~ctrfreq~corresponds to the geometric center of the passband of a
  center_frequency~ctrfreq~filter or a channel.
  cut_out_window~cutoutwindow~ Galileo Solid State Imaging-specific.  Images can be edited so that
  cut_out_window~cutoutwindow~only an image area or CUT OUT WINDOW is compressed using Integer Cosine
  cut_out_window~cutoutwindow~Transform, BARC or Huffman compression and transmitted to Earth.  The
  cut_out_window~cutoutwindow~cut_out_window element indicates the location and size of this image
  cut_out_window~cutoutwindow~area as defined by four numbers: starting line, starting sample, number
  cut_out_window~cutoutwindow~of lines, number of samples (the origin of the image coordinate system
  cut_out_window~cutoutwindow~is at line, sample=1,1 for the upper-left corner with samples
  cut_out_window~cutoutwindow~increasing to the right and lines increasing down).
  cycle_id~cycleid~The cycle_id element identifies one of several cycles, each of which is
  cycle_id~cycleid~a set of repeated activities.
  da_contact_pds_user_id~dapdsuserid~The da_contact_pds_user_id element provides the pds_user_id
  da_contact_pds_user_id~dapdsuserid~of the data administration contact at a node.
  data_coverage_percentage~datacvgpct~The data_coverage_percentage element gives the percentage of samples
  data_coverage_percentage~datacvgpct~obtained compared to the maximum number that could have been obtained.
  data_format~dataformat~The data_format element supplies the name of the data format or
  data_format~dataformat~language that was used to archive the science data that this software
  data_format~dataformat~accesses.
  data_lines~datalines~ The number of complete or partial lines with valid data
  data_lines~datalines~within a frame of high rate data.\n
  data_lines~datalines~Note:  Voyager
  data_lines~datalines~Specific:  A frame of high rate waveform data can include
  data_lines~datalines~up to 800 lines, however, some lines may be missing due to
  data_lines~datalines~data outages or only a partial frame may have been
  data_lines~datalines~recorded. This parameter provides some visibility on how
  data_lines~datalines~complete a given frame is.
  data_object_type~dataobjtype~The data_object_type element identifies the data object
  data_object_type~dataobjtype~type of a given set of data.
  data_object_type~dataobjtype~Example values:  IMAGE, MAP, SPECTRUM
  data_object_type~dataobjtype~Note:  Within the PDS, data object types are assigned
  data_object_type~dataobjtype~according to the standards outlined in the PDS Standards
  data_object_type~dataobjtype~Reference.
  data_object_type~dataobjtype~Note:  within AMMOS and only for the Magellan catalog, this
  data_object_type~dataobjtype~element is used as an alias for data_set_id.  The use of
  data_object_type~dataobjtype~data_object_type as such provides backward compatibility
  data_object_type~dataobjtype~with earlier AMMOS conventions.  The use of this element as
  data_object_type~dataobjtype~an alias for data_set_id is not recommended for any new
  data_object_type~dataobjtype~tables.  See data_set_id.
  data_path_type~datapathtype~The data_path_type element identifies the type of data path for trans-
  data_path_type~datapathtype~mission between an instrument and the ground data storage system.
  data_path_type~datapathtype~Example values:  REALTIME, RECORDED DATA PLAYBACK.
  data_quality_desc~dataquald~The data_quality_desc element describes the data
  data_quality_desc~dataquald~quality which is associated with a particular
  data_quality_desc~dataquald~data_quality_id value.
  data_quality_desc~dataquald~The various values of data_quality_id and
  data_quality_desc~dataquald~data_quality_desc are instrument dependent.
  data_quality_id~dataqualid~The data_quality_id element provides a numeric
  data_quality_id~dataqualid~key which identifies the quality of data available for a
  data_quality_id~dataqualid~particular time period.
  data_quality_id~dataqualid~The data_quality_id scheme is unique to a given
  data_quality_id~dataqualid~instrument and is described by the associated
  data_quality_id~dataqualid~data_quality_desc element.
  data_rate~datarate~The data_rate element provides the rate at which data were
  data_rate~datarate~transmitted from a spacecraft to the ground (i.e., the
  data_rate~datarate~telemetry rate).
  data_records~datarecords~The data_records data element indicates the number of
  data_records~datarecords~records that appear in a particular data file.\n  Note:
  data_records~datarecords~Note:  Within AMMOS, this element is used as a validation
  data_records~datarecords~tool to ensure data integrity for stream files that have
  data_records~datarecords~no end marker.
  data_sets~datasets~The data_sets element identifies the number of data sets
  data_sets~datasets~contained in a data set collection.
  data_source_desc~datasourced~The data_source_desc element describes the source of a data
  data_source_desc~datasourced~value descriptive of a target body.  The source may be a
  data_source_desc~datasourced~document, an individual, or an institution.
  data_source_desc~datasourced~See also data_source_id.
  data_source_id~datasourceid~The data_source_id element identifies the source
  data_source_id~datasourceid~of a data value descriptive of a target body.  The source
  data_source_id~datasourceid~may be a document, an individual, or an institution, as
  data_source_id~datasourceid~described by the associated data_source_desc element.
  data_stream_type~datastrmtype~The data_stream_type element identifies a particular type of
  data_stream_type~datastrmtype~data stream to which the given data product is related.
  data_stream_type~datastrmtype~Note:  In AMMOS this element is used to identify the
  data_stream_type~datastrmtype~particular type of data stream that a given decommutation
  data_stream_type~datastrmtype~map can process.
  data_type~datatype~The data_type element supplies the internal representation
  data_type~datatype~and/or mathematical properties of a value being stored.
  data_type~datatype~See also:  bit_data_type, general_data_type.
  data_type~datatype~Note:  In the PDS, users may find a bit-level description of
  data_type~datatype~each data type in the Standards Reference document.
  diffraction_corrected_flag~dcflag~ The diffraction_corrected_flag element is a yes-or-no flag
  diffraction_corrected_flag~dcflag~that indicates whether a ring occultation data product has
  diffraction_corrected_flag~dcflag~been corrected for diffraction.  In general, it equals 'N'
  diffraction_corrected_flag~dcflag~for stellar occultation but data may equal 'Y' or 'N' for
  diffraction_corrected_flag~dcflag~radio occultation data, depending on the processing.  If
  diffraction_corrected_flag~dcflag~the data product has been corrected for diffraction, then
  diffraction_corrected_flag~dcflag~the radres element specifies the processing
  diffraction_corrected_flag~dcflag~resolution.
  decal_name~decalname~The decal_name element describes the specific decalibration
  decal_name~decalname~data file.  This element is used only in AMMOS-Magellan
  decal_name~decalname~mission operations.
  declination~declination~The declination element provides the value of an angle,
  declination~declination~corresponding to latitude, used to fix position on the
  declination~declination~celestial sphere.
  declination~declination~Declination is measured positive north and negative south
  declination~declination~of the celestial equator, and is defined relative to a
  declination~declination~specified reference period or epoch.  See right_ascension.
  defining_authority_name~defauthyname~The defining_authority_name element identifies the
  defining_authority_name~defauthyname~Control Authority Office (CAO) responsible for
  defining_authority_name~defauthyname~maintaining the definition of a particular SFDU format.
  defining_authority_name~defauthyname~CAOs are officially recognized by the Consultative
  defining_authority_name~defauthyname~Committee for Space Data Systems (CCSDS).
  delimiting_parameter_name~delimparmnm~The delimiting_parameter_name element provides the name of
  delimiting_parameter_name~delimparmnm~a parameter the values of which are used to establish the
  delimiting_parameter_name~delimparmnm~boundaries of a set of data.
  delimiting_parameter_name~delimparmnm~Example values:  FRAME IDENTIFICATION, LOCAL TIME, MAXIMUM
  delimiting_parameter_name~delimparmnm~LATITUDE.
  derived_maximum~derivedmax~The derived_maximum element indicates the largest value
  derived_maximum~derivedmax~occurring in a given instance of the data object after the
  derived_maximum~derivedmax~application of a scaling factor and/or offset.
  derived_minimum~derivedmin~The derived_minimum element indicates the smallest value
  derived_minimum~derivedmin~occurring in a given instance of the data object after the
  derived_minimum~derivedmin~application of a scaling factor and/or offset.
  description~description~The description element provides a free-form,
  description~description~unlimited-length character string that represents or gives
  description~description~an account of something.
  detailed_catalog_flag~detailcatflg~The detailed_catalog_flag element is a yes-or-no flag
  detailed_catalog_flag~detailcatflg~which indicates whether additional information is available
  detailed_catalog_flag~detailcatflg~for this data set in a detailed-level catalog.
  detector_aspect_ratio~detaspectrto~The detector_aspect_ratio element provides the ratio of the
  detector_aspect_ratio~detaspectrto~horizontal to the vertical field of view of a detector.
  detector_desc~detd~The detector_desc element describes a detector utilized by
  detector_desc~detd~an instrument.
  detector_group_name~detgrpname~Definition TBD.
  detector_groups~detgrps~Definition TBD.
  detector_id~detid~The detector_id element identifies a particular instrument
  detector_id~detid~detector.
  detector_id~detid~The associated detector_desc element
  detector_id~detid~describes the detector.
  detectors~dets~The detectors element provides the number of detectors of a
  detectors~dets~specified type contained in the subject instrument.
  detector_temperature~dettemp~The DETECTOR_TEMPERATURE is the temperature that the instrument
  detector_temperature~dettemp~(detector) operated at while a measurement was made. The importance for
  detector_temperature~dettemp~Viking Lander is that the radiometric calibration is slightly dependent
  detector_temperature~dettemp~on detector temperature.
  detector_type~dettype~The detector_type element identifies the type of an
  detector_type~dettype~instrument's detector.
  detector_type~dettype~Example values: SI CCD, INSB, GE, VIDICON, PHOTODIODE.
  discipline_desc~discd~The discipline_desc element describes the discipline
  discipline_desc~discd~identified by the discipline_name element.
  discipline_name~discname~The discipline_name element identifies the major academic
  discipline_name~discname~or scientific domain or specialty of interest to an
  discipline_name~discname~individual or to a PDS Node.
  document_topic_type~doctopictype~The document_topic_type element is a keyword which
  document_topic_type~doctopictype~identifies the major topic of a reference document.
  document_format~documentfmt~The document_format element represents the manner in which
  document_format~documentfmt~documents are stored, such as TEX, POSTSCRIPT, TIFF, etc.
  document_format~documentfmt~Version numbers for these formats should be included when
  document_format~documentfmt~appropriate, such as `WORDPERFECT 5.0'.
  document_name~documentname~The document_name element provides the name of a document.
  download_id~downloadid~The download_id element is the unique mission identifier
  download_id~downloadid~used to indicate a download of the spacecraft's onboard
  download_id~downloadid~digital data storage unit.
  dark_current_file_name~drkcrntfilnm~The DARK_CURRENT_FILE_NAME element provides the dark
  dark_current_file_name~drkcrntfilnm~current image file (an image taken without opening the
  dark_current_file_name~drkcrntfilnm~camera shutter) which should be used to perform radiometric
  dark_current_file_name~drkcrntfilnm~calibration of the image.  The dark current image provides
  dark_current_file_name~drkcrntfilnm~a reference label of the build-up of any charges on the
  dark_current_file_name~drkcrntfilnm~sensor that need to be subtracted from a shuttered image
  dark_current_file_name~drkcrntfilnm~during calibration.  Selection of the appropriate dark
  dark_current_file_name~drkcrntfilnm~current image may be based on time, camera, temperature,
  dark_current_file_name~drkcrntfilnm~readout conditions, light flood, gain and offset.
  data_set_acceptance_date~dsacceptdate~Definition TBD.
  data_set_catalog_flag~dscatflag~The data_set_catalog_flag element indicates whether or not a data set
  data_set_catalog_flag~dscatflag~collection or a data set exists in the PDS Data Set Catalog.
  data_set_collection_desc~dscolld~The data_set_collection_desc element describes the content
  data_set_collection_desc~dscolld~and type of the related data sets contained in the
  data_set_collection_desc~dscolld~collection.
  data_set_coll_or_data_set_id~dscolldsid~The data_set_coll_or_data_set_id element provides the
  data_set_coll_or_data_set_id~dscolldsid~identifier for either a PDS data set collection or data
  data_set_coll_or_data_set_id~dscolldsid~set.
  data_set_collection_id~dscollid~The data_set_collection_id element is a unique alphanumeric
  data_set_collection_id~dscollid~identifier for a collection of related data sets or data
  data_set_collection_id~dscollid~products.  The data set collection is treated as a single
  data_set_collection_id~dscollid~unit, whose components are selected according to a specific
  data_set_collection_id~dscollid~scientific purpose.  Components are related by observation
  data_set_collection_id~dscollid~type, discipline, target, time, or other classifications.
  data_set_collection_id~dscollid~Example value: PREMGN-E/L/H/M/V-4/5-RAD/GRAV-V1.0
  data_set_collection_id~dscollid~Note: In the PDS, data set collection ids are constructed
  data_set_collection_id~dscollid~according to PDS nomenclature standards outlined in the
  data_set_collection_id~dscollid~in the Standards Reference.
  data_set_collection_member_flg~dscollmemflg~The data_set_collection_member_flg element indicates
  data_set_collection_member_flg~dscollmemflg~whether or not a data set is a member of a data set
  data_set_collection_member_flg~dscollmemflg~collection.
  data_set_collection_name~dscollname~The data_set_collection_name element provides the full name
  data_set_collection_name~dscollname~given to a collection of related data sets or data products.
  data_set_collection_name~dscollname~The data set collection is treated as a single unit, whose
  data_set_collection_name~dscollname~components are selected according to a specific scientific
  data_set_collection_name~dscollname~purpose.  Components are related by observation type,
  data_set_collection_name~dscollname~discipline, target, time, or other classifications.
  data_set_collection_name~dscollname~Example value: PRE-MAGELLAN E/L/H/M/V 4/5 RADAR/GRAVITY
  data_set_collection_name~dscollname~DATA V1.0
  data_set_collection_name~dscollname~Note:  In the PDS, the data set collection name is
  data_set_collection_name~dscollname~constructed according to nomenclature standards outlined
  data_set_collection_name~dscollname~in the PDS Standards Reference.
  data_set_collection_release_dt~dscollreldt~The data_set_collection_release_dt element provides the
  data_set_collection_release_dt~dscollreldt~date when the data set collection was released for use.
  data_set_collection_release_dt~dscollreldt~Formation rule:  YYYY-MM-DD
  data_set_collection_usage_desc~dscollusgd~The data_set_collection_usage_desc element provides
  data_set_collection_usage_desc~dscollusgd~information required to use the data.
  data_set_desc~dsd~The data_set_desc element describes the content and
  data_set_desc~dsd~type of a data set and provides information required to use
  data_set_desc~dsd~the data (such as binning information).
  data_set_id~dsid~The data_set_id element is a unique
  data_set_id~dsid~alphanumeric identifier for a data set or a data product.
  data_set_id~dsid~The data_set_id value for a given data set or
  data_set_id~dsid~product is constructed according to flight project
  data_set_id~dsid~naming conventions.  In most cases the data_set_id is an
  data_set_id~dsid~abbreviation of the data_set_name.
  data_set_id~dsid~Example value: MR9/VO1/VO2-M-ISS/VIS-5-CLOUD-V1.0.
  data_set_id~dsid~Note:  In the PDS, the values for both data_set_id and
  data_set_id~dsid~data_set_name are constructed according to standards
  data_set_id~dsid~outlined in the Standards Reference.
  data_set_or_inst_parm_desc~dsinstparmd~The data_set_or_inst_parm_desc element describes either a
  data_set_or_inst_parm_desc~dsinstparmd~data set or instrument parameter.
  data_set_or_instrument_parm_nm~dsinstparmnm~The data_set_or_instrument_parameter_name element provides
  data_set_or_instrument_parm_nm~dsinstparmnm~either a data_set_parameter_name or an
  data_set_or_instrument_parm_nm~dsinstparmnm~instrument_parameter_name.  That is, this element may have
  data_set_or_instrument_parm_nm~dsinstparmnm~values which are either the name of a parameter derived from
  data_set_or_instrument_parm_nm~dsinstparmnm~measured data (the data_set_parameter_name) or the name of a
  data_set_or_instrument_parm_nm~dsinstparmnm~parameter measured by an instrument (the
  data_set_or_instrument_parm_nm~dsinstparmnm~instrument_parameter_name).
  data_set_local_id~dslocalid~ The DATA_SET_LOCAL_ID element provides a short (of order 3
  data_set_local_id~dslocalid~characters) acronym used as the local ID of a data set
  data_set_local_id~dslocalid~(Example value: IGLC). It may also appear as the first
  data_set_local_id~dslocalid~element of file names from a particular DATA_SET (Example
  data_set_local_id~dslocalid~value:IGLCINDX.LBL).
  data_set_name~dsname~The data_set_name element provides the full name given to a
  data_set_name~dsname~data set or a data product.  The data_set_name typically
  data_set_name~dsname~identifies the instrument that acquired the data, the target
  data_set_name~dsname~of that instrument, and the processing level of the data.
  data_set_name~dsname~Example value:  MR9/VO1/VO2 MARS IMAGING SCIENCE
  data_set_name~dsname~SUBSYSTEM/VIS 5 CLOUD V1.0.  See also:  data_set_id.
  data_set_name~dsname~Note:  In PDS, the data_set_name is constructed according to
  data_set_name~dsname~standards outlined in the Standards Reference.
  data_set_name~dsname~Note: This element is defined in the AMMOS Magellan catalog
  data_set_name~dsname~as an alias for file_name to provide backward compatibility
  dsn_spacecraft_num~dsnscnum~The dsn_spacecraft_num element identifies the unique Deep
  dsn_spacecraft_num~dsnscnum~Space Network identification number for a spacecraft or
  dsn_spacecraft_num~dsnscnum~other data source/sink from which a product came or to which
  dsn_spacecraft_num~dsnscnum~the product is to be sent.
  dsn_station_number~dsnstatnnum~The dsn_station_num identifies the deep space network
  dsn_station_number~dsnstatnnum~station number through which data were received or to
  dsn_station_number~dsnstatnnum~which commands are to be sent.
  data_set_parameter_name~dsparmname~The data_set_parameter_name element provides the name of
  data_set_parameter_name~dsparmname~the scientific parameter or physical quantity that was
  data_set_parameter_name~dsparmname~derived from measured data.  A description of the dataset
  data_set_parameter_name~dsparmname~parameter is provided by the data_set_or_inst_parm_desc.
  data_set_parameter_name~dsparmname~See also instrument_parameter_name.
  data_set_parameter_name~dsparmname~Example value: MAGNETIC FIELD INTENSITY
  data_set_parameter_unit~dsparmunit~The data_set_parameter_unit element specifies the unit of
  data_set_parameter_unit~dsparmunit~measure of associated data set parameters.
  display_format~dspfmt~The display_format element provides display format
  display_format~dspfmt~information to software that formats data to an output
  display_format~dspfmt~device.  Valid format types include DATE(x) where X is the
  display_format~dspfmt~number of digits in a date.  Usually DATE(6) (YYYY-MM) or
  display_format~dspfmt~DATE(8) (YYYY-MM-DD).  TIME(X) where X is the number of
  display_format~dspfmt~digits in a time statement.  This is usually represented as
  display_format~dspfmt~TIME(6) (HH:MM:SS) or TIME(4) (HH:MM)>  DATETIME is used
  display_format~dspfmt~for UTC system format date-times (MM-DD-YYYYTHH:MM:SS.HHH). JUSTLEFT is
  display_format~dspfmt~used for left-justified character strings, and JUSTRIGHT is
  display_format~dspfmt~used for right justification.  DIGIT(X) is used where X is
  display_format~dspfmt~the number of digits in an integer, so 897 would be
  display_format~dspfmt~DIGIT(3).  SCI(X,Y) is used where X is the number of
  display_format~dspfmt~significant digits before the decimal in scientific
  display_format~dspfmt~notation, and Y is the number following the decimal, so
  display_format~dspfmt~1.293E-2 would be SCI(1,3).  FLOAT(X) is used where X is the
  display_format~dspfmt~total number of digits in a floating point number, so
  display_format~dspfmt~33.018746 would be FLOAT(8).  USDOLLAR is used for monetary
  display_format~dspfmt~amounts in the indicated currency, PHONE is used for
  display_format~dspfmt~telephone numbers, and FTSPHONE is used for seven-digit
  display_format~dspfmt~numbers in the Federal Telephone System.
  data_set_release_date~dsreleasedt~The data_set_release_date element provides the date when
  data_set_release_date~dsreleasedt~a data set is released by the data producer for archive
  data_set_release_date~dsreleasedt~or publication.  In many systems this represents the end of
  data_set_release_date~dsreleasedt~a proprietary or validation period.
  data_set_release_date~dsreleasedt~Formation rule:  YYYY-MM-DD
  data_set_release_date~dsreleasedt~Note:  In AMMOS, the data_set_release_date element is used to
  data_set_release_date~dsreleasedt~identify the date at which a product may be released to the
  data_set_release_date~dsreleasedt~general public from proprietary access.  AMMOS-related
  data_set_release_date~dsreleasedt~systems should apply this element only to proprietary data.
  dust_flag~dustflag~The DUST_FLAG parameter indicates whether a dust sequence was executed
  dust_flag~dustflag~in association with an image or observation.
  earth_received_time~earthrcvdtm~The earth_received_time element provides the time at which
  earth_received_time~earthrcvdtm~telemetry was received on earth. This should be
  earth_received_time~earthrcvdtm~represented in the UTC system format.  For real time
  earth_received_time~earthrcvdtm~data, the difference between this time and the
  earth_received_time~earthrcvdtm~spacecraft_event_time is the signal travel time from the
  earth_received_time~earthrcvdtm~spacecraft to earth.
  earth_received_time~earthrcvdtm~Formation rule: YYYY-MM-DDThh:mm:ss[.fff]
  earth_base_desc~ebd~The earth_base_desc element describes the earth base
  earth_base_desc~ebd~from which particular instrument measurements where taken.
  earth_base_desc~ebd~An earth base can be a laboratory, observatory, etc., and is
  earth_base_desc~ebd~identified by the earth_base_id element.
  earth_base_id~ebid~The earth_base_id element provides a unique identifier for
  earth_base_id~ebid~the laboratory, observatory, or other location of an earth-
  earth_base_id~ebid~based instrument.
  earth_base_institution_name~ebinstnname~The earth_base_institution_name element identifies a
  earth_base_institution_name~ebinstnname~university, research center, NASA center or other
  earth_base_institution_name~ebinstnname~institution associated with a laboratory or observatory.
  earth_base_name~ebname~The earth_base_name element identifies the name of the
  earth_base_name~ebname~laboratory, observatory, or other location of a earth-based
  earth_base_name~ebname~instrument.
  edit_mode_id~editmodeid~The edit_mode_id element indicates the amount of data read
  edit_mode_id~editmodeid~from an imaging instrument's vidicon. '1:1' indicates the
  edit_mode_id~editmodeid~full-resolution of the vidicon. Example values: (Voyager)
  edit_mode_id~editmodeid~3:4, 1:2, 1:3, 1:5, and 1:1.
  edit_routine_name~editrtnname~The edit_routine_name element provides the name of a edit
  edit_routine_name~editrtnname~routine name that the catalog bulk loading software should
  edit_routine_name~editrtnname~ execute during any validation procedures.
  edr_file_number~edrfilename~The EDR_FILE_NUMBER element provides the file position of
  edr_file_number~edrfilename~the data file when it was originally recorded on an
  edr_file_number~edrfilename~Experiment Data Record tape.
  edr_software_name~edrswname~The edr_software_name element identifies the name and
  edr_software_name~edrswname~version of the Clementine Mission software that generated
  edr_software_name~edrswname~the EDR products.
  edr_tape_id~edrtapeid~The EDR_TAPE_ID element indicates the volume identifier of
  edr_tape_id~edrtapeid~the Experiment Data Record tape on which the data file was
  edr_tape_id~edrtapeid~originally recorded.
  effective_time~effctivetime~The effective_time is an alias for start_time used by AMMOS-
  effective_time~effctivetime~MGN ephemeris files to define the time at which the data
  effective_time~effctivetime~takes effect.
  electronic_mail_id~elecmailid~The electronic_mail_id element provides an individual's
  electronic_mail_id~elecmailid~mailbox name on the electronic mail system identified by
  electronic_mail_id~elecmailid~the electronic_mail_type element.
  electronic_mail_type~elecmailtype~The electronic_mail_type element identifies an electronic
  electronic_mail_type~elecmailtype~mail system by name.
  electronic_mail_type~elecmailtype~Example values: TELEMAIL, NSI/DECNET.
  electronics_desc~elecsd~The electronics_desc element describes the
  electronics_desc~elecsd~electronics associated with a given instrument.
  electronics_id~elecsid~The electronics_id element identifies the electronics
  electronics_id~elecsid~associated with a given instrument.
  elevation~elevation~The elevation element provides the angular elevation of a
  elevation~elevation~point of interest (for example, the center point of an
  elevation~elevation~image of a solar system object taken from a lander or a
  elevation~elevation~rover) above the azimuthal reference plane.
  elevation~elevation~Elevation is measured in a spherical coordinate system.
  elevation~elevation~The zero elevation point lies in the azimuthal reference
  elevation~elevation~plane and positive elevation is measured toward the
  elevation~elevation~positive direction of the principal axis of the spherical
  elevation~elevation~coordinate system.  See azimuth.
  emission_angle~emissang~The emission_angle element provides the value of the angle
  emission_angle~emissang~between the surface normal vector at the intercept point
  emission_angle~emissang~and a vector from the intercept point to the spacecraft.
  emission_angle~emissang~The emission_angle varies from 0 degrees when the
  emission_angle~emissang~spacecraft is viewing the subspacecraft point (nadir
  emission_angle~emissang~viewing) to 90 degrees when the intercept is tangent to the
  emission_angle~emissang~surface of the target body. Thus, higher values of
  emission_angle~emissang~emission_angle indicate more oblique viewing of the target.
  emission_angle~emissang~Values in the range of 90 to 180 degrees are possible for
  emission_angle~emissang~ring data.
  encoding_max_compression_ratio~encdcmprmax~ The encoding_max_compression_ratio element provides the maximum
  encoding_max_compression_ratio~encdcmprmax~compression ratio applied to the data on board the spacecraft.  For
  encoding_max_compression_ratio~encdcmprmax~Galileo, this keyword is valid only for Integer Cosine Transform (ICT)
  encoding_max_compression_ratio~encdcmprmax~or Huffman compression. If the image is compressed with ICT this value
  encoding_max_compression_ratio~encdcmprmax~is the ICT Maximum Compression Ratio, otherwise it is the Huffman
  encoding_max_compression_ratio~encdcmprmax~Maximum Compression Ratio.
  encoding_min_compression_ratio~encdcmprmin~ The encoding_min_compression_ratio element provides the minimum
  encoding_min_compression_ratio~encdcmprmin~compression ratio applied to the data on board the spacecraft. For
  encoding_min_compression_ratio~encdcmprmin~Galileo, valid only for Integer Cosine Transform (ICT) or Huffman
  encoding_min_compression_ratio~encdcmprmin~compression. If the image is compressed with ICT this value is the ICT
  encoding_min_compression_ratio~encdcmprmin~Minimum Compression Ratio, otherwise it is the Huffman Minimum
  encoding_min_compression_ratio~encdcmprmin~Compression Ratio.
  encoding_compression_ratio~encdcmprsrto~The encoding_compression_ratio element specifies the
  encoding_compression_ratio~encdcmprsrto~compression factor of the data.
  encoding_type~encodingtype~The encoding_type element indicates the type of compression
  encoding_type~encodingtype~or encryption used for data storage.
  entropy~entropy~The ENTROPY element identifies the average entropy level
  entropy~entropy~(bits/pixel).  Entropy is a measure of scene activity and
  entropy~entropy~it applies to the entire image.
  entropy~entropy~Note: For the Galileo SSI flight images the entropy
  entropy~entropy~is defined as: H = - SUM (from j= -255 to j= +255)
  entropy~entropy~p(j) [log(2) p(j)] where p(j) is the probability
  entropy~entropy~that two horizontally adjacent pixels have a
  entropy~entropy~different j, where - 255 <j < 255.
  equatorial_radius~equatradius~The equatorial_radius element provides the average radius in
  equatorial_radius~equatradius~the equatorial plane of the best fit spheroid which
  equatorial_radius~equatradius~approximates the target body.
  earth_received_start_time~erstart~ The earth_received_start_time element provides the
  earth_received_start_time~erstart~beginning time at which telemetry was received during a
  earth_received_start_time~erstart~time period of interest.  This should be represented in UTC
  earth_received_start_time~erstart~system format. See also earth_received_time.
  earth_received_stop_time~erstop~ The earth_received_stop_time element provides the ending
  earth_received_stop_time~erstop~time for receiving telemetry  during a time period of
  earth_received_stop_time~erstop~interest.  This should be represented in the UTC system format. See
  earth_received_stop_time~erstop~also earth_received_time.
  easternmost_longitude~estrnmostlon~The following definitions describe easternmost longitude for the
  easternmost_longitude~estrnmostlon~body-fixed, rotating coordinate systems:
  easternmost_longitude~estrnmostlon~ 
  easternmost_longitude~estrnmostlon~For Planetocentric coordinates and for Planetographic coordinates in
  easternmost_longitude~estrnmostlon~which longitude increases toward the east, the easternmost (rightmost)
  easternmost_longitude~estrnmostlon~longitude of a spatial area (e.g.,a map, mosaic, bin,feature or region)
  easternmost_longitude~estrnmostlon~is the maximum numercial value of longitude unless it crosses the
  easternmost_longitude~estrnmostlon~Prime Meridian.
  easternmost_longitude~estrnmostlon~ 
  easternmost_longitude~estrnmostlon~For Planetographic coordinates in which longitude increases toward the
  easternmost_longitude~estrnmostlon~west, the easternmost (rightmost) longitude of a spatial area (e.g., a
  easternmost_longitude~estrnmostlon~map,mosaic, bin, feature or region) is the minimum numerical value
  easternmost_longitude~estrnmostlon~of longitude unless it crosses the Prime Meridian.
  easternmost_longitude~estrnmostlon~ 
  easternmost_longitude~estrnmostlon~For the Earth, Moon and Sun, PDS also supports the traditional use of
  easternmost_longitude~estrnmostlon~the range (-180,180) in which case the easternmost (rightmost) longitude
  easternmost_longitude~estrnmostlon~is the maximum numerical value of longitude unless it crosses 180.
  event_name~evtname~The event_name element identifies an event.  This may be a
  event_name~evtname~spacecraft event, a ground_based event or a system event.
  event_start_hour~evtstrthour~The event_start_hour element provides the date and hour of
  event_start_hour~evtstrthour~the beginning of an event (whether a spacecraft event, a
  event_start_hour~evtstrthour~ground based event or a system event) in the PDS standard
  event_start_hour~evtstrthour~(UTC system) format.  The values associated with this element are
  event_start_hour~evtstrthour~derived from existing values of  event_start_time and are
  event_start_hour~evtstrthour~used strictly for the PDS catalog performance enhancements.
  event_type~evttype~The event_type element identifies the classification of an
  event_type~evttype~event.
  event_type~evttype~Example values:  MAGNETOPAUSE CROSSING, VOLCANIC ERUPTION,
  event_type~evttype~CLOSEST APPROACH.
  event_type_desc~evttyped~The event_type_desc element describes the type of
  event_type_desc~evttyped~event identified by the event_type element.
  exposure_duration~exposdur~The exposure_duration element provides the value of the
  exposure_duration~exposdur~time interval between the opening and closing of an instrument
  exposure_duration~exposdur~aperture (such as a camera shutter).
  exposure_offset_flag~exposoffflg~The exposure_offset_flag element indicates the
  exposure_offset_flag~exposoffflg~(instrument_dependent) mode of the offset state of a
  exposure_offset_flag~exposoffflg~camera.
  exposure_offset_flag~exposoffflg~Offset is a constant value which is added to an
  exposure_offset_flag~exposoffflg~instrument's output signal to increase or decrease the
  exposure_offset_flag~exposoffflg~level of that output.
  exposure_offset_number~exposoffnum~The exposure_offset_number element provides the value of a
  exposure_offset_number~exposoffnum~numerical constant which was added to the exposure duration
  exposure_offset_number~exposoffnum~for a given imaging instrument.
  exposure_type~exposuretype~The EXPOSURE_TYPE element indicates the exposure setting on
  exposure_type~exposuretype~a camera.
  expertise_area_desc~exprtaread~The expertise_area_desc element describes a
  expertise_area_desc~exprtaread~particular area of individual expertise.
  expertise_area_type~exprtareatyp~The expertise_area_type element identifies an
  expertise_area_type~exprtareatyp~individual's area of expertise.
  expertise_area_type~exprtareatyp~The corresponding expertise_area_desc element
  expertise_area_type~exprtareatyp~describes the area of expertise.
  facility_name~facilityname~The facility_name element identifies a department,
  facility_name~facilityname~laboratory, or subsystem that exists within an institution.
  fax_number~faxnumber~ The fax_number data element provides the area code and
  fax_number~faxnumber~telephone number needed to transmit data to an individual
  fax_number~faxnumber~or a node via facsimile machine.
  feature_name~featname~The feature_name element provides the proper IAU_approved
  feature_name~featname~name of a feature on a solar system body.
  feature_name~featname~Example value:  OLYMPUS MONS.
  feature_type~feattype~The feature_type element identifies the type of a
  feature_type~feattype~particular feature, according to IAU standards.
  feature_type~feattype~Example values:  IMPACT CRATER, VOLCANO.
  feature_type_desc~feattyped~The feature_type_desc element provides the IAU
  feature_type_desc~feattyped~standard definition for a particular feature_type.
  file_name~filename~The file_name element provides the location independent name of a file.
  file_name~filename~It excludes node or volume location, directory path names, and version
  file_name~filename~specification.  To promote portability across multiple platforms, PDS
  file_name~filename~requires the file_name to be limited to an 8-character basename, a full
  file_name~filename~stop (. period), and a 3-character extension.  Valid characters include
  file_name~filename~capital letters A - Z, numerals 0 - 9, and the underscore character (_).
  file_records~filerecords~The file_records element indicates the number of physical
  file_records~filerecords~file records, including both label records and data
  file_records~filerecords~records.
  file_records~filerecords~Note:  In the PDS the use of file_records along
  file_records~filerecords~with other file-related data elements is fully described in
  file_records~filerecords~the Standards Reference.
  files~files~The files element identifies the total number of files.
  files~files~Note:  As an example in the PDS, the keyword files within
  files~files~the Directory Object indentifies the total number of files
  files~files~in the directory.  Within the Volume Object the keyword
  files~files~files identifies the number of files within the volume.
  file_specification_name~filespecname~The file_specification_name element provides the full name of a file,
  file_specification_name~filespecname~including a path name, relative to a PDS volume.  It excludes node or
  file_specification_name~filespecname~volume location.  Path names are limited to eight (8) directory levels,
  file_specification_name~filespecname~and are separated by the forward slash (/) character.  Each directory
  file_specification_name~filespecname~is limited to 8 characters chosen from the set {A-Z, 0-9,_}.  The path
  file_specification_name~filespecname~is followed by a valid file name.  See also:  file_name.
  file_specification_name~filespecname~ 
  file_specification_name~filespecname~Example values:
  file_specification_name~filespecname~     TG15NXXX/TG15N1XX/TG15N12X/TG15N120.DAT
  file_specification_name~filespecname~     EDR/C100611/E1006110.00A
  filter_name~filtname~The filter_name element provides the commonly-used name of
  filter_name~filtname~the instrument filter through which an image or measurement
  filter_name~filtname~was acquired or which is associated with a given instrument
  filter_name~filtname~mode.
  filter_name~filtname~Example values:  RED, GREEN.
  filter_name~filtname~See also filter_number.
  filter_number~filtnum~The filter_number element provides the number of an
  filter_number~filtnum~instrument filter through which an image or measurement was
  filter_number~filtnum~acquired or which is associated with a given instrument
  filter_number~filtnum~mode.
  filter_number~filtnum~Note that the filter_number is unique, while the
  filter_number~filtnum~filter_name is not.
  filter_type~filttype~The filter_type element identifies the type of a given
  filter_type~filttype~instrument filter.
  filter_type~filttype~Example values:  INTERFERENCE, MESH, BANDPASS, BLOCKING.
  first_image_time~firstimgt~The first_image_time element indicates the start_time (or
  first_image_time~firstimgt~image_time) that appears in the label of the first image on
  first_image_time~firstimgt~an archive medium.
  first_line~firstline~The first_line element indicates the line within a source
  first_line~firstline~image that corresponds to the first line in a sub-image.
  first_product_id~firstprodid~The first_product_id data element indicates the product_id
  first_product_id~firstprodid~that appears in the label of the first data product on an
  first_product_id~firstprodid~archive medium.
  flattening~flattening~The flattening data element provides the value of the geometric
  flattening~flattening~oblateness of a target body, defined as the ratio of the difference
  flattening~flattening~between the body's equatorial and polar radii to the equatorial radius
  flattening~flattening~(in most cases, evaluated as:
  flattening~flattening~    ( a_axis_radius - c_axis_radius ) / a_axis_radius).
  format_desc~fmtd~The format_desc element provides a textual description of
  format_desc~fmtd~the format of the subject data.
  focal_plane_temperature~focplanetemp~The focal_plane_temperature element provides the
  focal_plane_temperature~focplanetemp~temperature of the focal plane array in degrees kelvin at
  focal_plane_temperature~focplanetemp~the time the observation was made.
  format~format~A specified or predetermined arrangement of data within a
  format~format~file or on a storage medium.
  format~format~Note:  In the PDS, the format element indicates the display
  format~format~specification for a collection of data.  It is equivalent
  format~format~to the FORTRAN language format specification.  Example
  format~format~values:  'Ew.deEXP', A6, I5.
  formation_rule_desc~formruledesc~The formation_rule_desc element supplies a rule that is to
  formation_rule_desc~formruledesc~be applied during the creation of a value for the data
  formation_rule_desc~formruledesc~element. For example, the values supplied for
  formation_rule_desc~formruledesc~reference_key_id must conform to the rules used by a
  formation_rule_desc~formruledesc~specific professional journal for referencing citations.
  fovs~fovs~The fovs (fields-of-view) element indicates the number of
  fovs~fovs~fields of view associated with a single fov shape within a
  fovs~fovs~section of an instrument.
  fov_shape_name~fovshapename~The field_of_view_shape_name element identifies the
  fov_shape_name~fovshapename~geometric shape of the field of view of an instrument.
  frame_duration~framedur~The frame_duration element provides the value of the length
  frame_duration~framedur~of time required to measure one frame of data.  The
  frame_duration~framedur~frame_duration is constant within a given instrument cycle,
  frame_duration~framedur~which is identified by the cycle_id element.
  frame_id~frameid~The frame_id element provides an identification for a
  frame_id~frameid~particular instrument measurement frame.  A frame consists
  frame_id~frameid~of a sequence of measurements made over a specified time
  frame_id~frameid~interval, and may include measurements from different
  frame_id~frameid~instrument modes.  These sequences repeat from cycle to
  frame_id~frameid~cycle and sometimes within a cycle.
  frames~frames~The frames element provides the number of frames within a
  frames~frames~particular cycle, which is identified by the cycle_id
  frames~frames~element.
  frame_sequence_number~frameseqnum~The frame_sequence_number element indicates the location
  frame_sequence_number~frameseqnum~within a cycle at which a specific frame occurs.  Frames are
  frame_sequence_number~frameseqnum~repeated in a specific order within each cycle.
  first_line_sample~frstlinesamp~The first_line_sample element indicates the sample within a
  first_line_sample~frstlinesamp~source image that corresponds to the first sample in a
  first_line_sample~frstlinesamp~sub-image.
  first_standard_parallel~frststdparll~The first_standard_parallel element  is used in Conic
  first_standard_parallel~frststdparll~projections.  If a Conic projection has a single standard
  first_standard_parallel~frststdparll~parallel, then the first_standard_parallel is the point of
  first_standard_parallel~frststdparll~tangency between the sphere of the planet and the cone of
  first_standard_parallel~frststdparll~the projection.  If there are two standard parallels
  first_standard_parallel~frststdparll~(first_standard_parallel, second_standard_parallel), these
  first_standard_parallel~frststdparll~parallel are the intersection lines  between the sphere of
  first_standard_parallel~frststdparll~the planet and the cone of the projection.  The map_scale
  first_standard_parallel~frststdparll~is defined at the standard parallels.
  ftp_file_format~ftpfilefmt~The ftp_file_format element describes the format of the file at the
  ftp_file_format~ftpfilefmt~anonymous ftp site.
  ftp_site_id~ftpsiteid~The ftp_site_id element supplies name of an anonymous ftp site from
  ftp_site_id~ftpsiteid~which this software may be retrieved
  fts_number~ftsnum~The fts_number element provides the Federal
  fts_number~ftsnum~Telecommunications System (FTS) telephone number of an
  fts_number~ftsnum~individual.
  full_name~fullname~The full_name element provides the complete name or
  full_name~fullname~identifier for a person or object.  For an individual,
  full_name~fullname~full name includes the name as well as titles and suffixes.
  full_name~fullname~For an object, full name provides the spelled-out name that
  full_name~fullname~in some cases corresponds to an 'id'.
  gain_mode_id~gainmodeid~The gain_mode_id element identifies the gain
  gain_mode_id~gainmodeid~state of an instrument.
  gain_mode_id~gainmodeid~Gain is a constant value which is multiplied with an
  gain_mode_id~gainmodeid~instrument's output signal to increase or decrease the
  gain_mode_id~gainmodeid~level of that output.
  gain_modes~gainmodes~The gain_modes element provides the number of gain states of
  gain_modes~gainmodes~a particular instrument or section of an instrument.
  gain_number~gainnum~The GAIN_NUMBER indicates the gain value used in the analog to digital
  gain_number~gainnum~conversion.  The gain value is a multiplicative factor used in the
  gain_number~gainnum~analog to digital conversion.
  general_catalog_flag~gencatflag~The general_catalog_flag element is a yes-or-no flag
  general_catalog_flag~gencatflag~indicating whether a data set collection or data set
  general_catalog_flag~gencatflag~exists in a PDS catalog.  (invfastrack, invphotoprod)
  general_classification_type~genclasstype~The general_classification_type data element serves to
  general_classification_type~genclasstype~allow data systems to group data objects or elements
  general_classification_type~genclasstype~according to common characteristics.  Its purpose is akin
  general_classification_type~genclasstype~to subject access in library systems, because it allows the
  general_classification_type~genclasstype~user to find a data element according to its membership
  general_classification_type~genclasstype~in a larger category.  In this document the
  general_classification_type~genclasstype~general_classification_type is an indexing mechanism for
  general_classification_type~genclasstype~data element names, to allow them to be published in a
  general_classification_type~genclasstype~classified list entitled 'DATA ELEMENT CLASSIFIED LISTINGS'.
  general_classification_type~genclasstype~See also:  system_classification_id.
  general_data_type~gendatatype~The general_data_type element classifies a data element
  general_data_type~gendatatype~according to a non-implementation-specific list of data
  general_data_type~gendatatype~types published in the ISO standards documentation.
  general_data_type~gendatatype~Examples:  CHARACTER, INTEGER. Please refer to the section
  general_data_type~gendatatype~entitled 'DATA TYPE STANDARDS' in this document.  See also:
  general_data_type~gendatatype~data_type.
  general_data_type~gendatatype~Note: In the PDS, data type standards for more
  general_data_type~gendatatype~system-specific applications are described in the Data
  general_data_type~gendatatype~Preparation Workbook.
  header_type~headertype~The header_type element identifies a specific type of
  header_type~headertype~header data structure.  For example: FITS, VICAR.
  header_type~headertype~Note:  In the PDS, header_type is used to indicate non-PDS
  header_type~headertype~headers.
  help_id~helpid~The help_id element identifies a PDS topic for which help
  help_id~helpid~text is available.
  help_name~helpname~The help_name element provides the key to help text used in
  help_name~helpname~the Inspect Data function.
  help_text~helptext~The help_text element provides the ascii help text used for
  help_text~helptext~ online help in the Inspect Data function.
  highest_detectable_opacity~highdetopac~The highest_detectable_opacity element indicates the
  highest_detectable_opacity~highdetopac~sensitivity of a ring occultation data set to nearly
  highest_detectable_opacity~highdetopac~opaque rings.  It specifies the normal ring opacity
  highest_detectable_opacity~highdetopac~corresponding to a signal one standard deviation
  highest_detectable_opacity~highdetopac~above the background (complete obstructed) signal.
  highest_detectable_opacity~highdetopac~The value is computed assuming the data has been
  highest_detectable_opacity~highdetopac~re-processed to the radial resolution specified by
  highest_detectable_opacity~highdetopac~the reference_radial_resolution element.
  horizontal_pixel_scale~horpixelscl~The HORIZONTAL_PIXEL_SCALE element indicates the horizontal
  horizontal_pixel_scale~horpixelscl~picture scale.
  horizontal_fov~horzfov~The horizontal_field_of_view element provides the angular
  horizontal_fov~horzfov~measure of the horizontal field of view of an instrument.
  horizontal_framelet_offset~horzframeoff~The horizontal_framelet_offset provides the row number of a
  horizontal_framelet_offset~horzframeoff~framelet within a tiled image. In the PDS, offsets are
  horizontal_framelet_offset~horzframeoff~counted from one.
  horizontal_pixel_fov~horzpixfov~The horizontal_pixel_field_of_view element provides the
  horizontal_pixel_fov~horzpixfov~angular measure of the horizontal field of view of a single
  horizontal_pixel_fov~horzpixfov~pixel.
  host_id~hostid~The host_id element provides the name or identification of
  host_id~hostid~the particular computer on which the product was generated.
  hardware_model_id~hrdwrmodelid~The hardware_model_id element identifies the computer
  hardware_model_id~hrdwrmodelid~hardware on which a data product was produced. (e.g. VAX
  hardware_model_id~hrdwrmodelid~11/780, MACINTOSH II).
  huffman_table_type~hufftbltyp~ The The huffman_table_type element indicates the type of Huffman table
  huffman_table_type~hufftbltyp~used in compression. For Galileo the valid values are: SKEWED, UNIFORM,
  huffman_table_type~hufftbltyp~N/A.
  iras_clock_angle_rate_sigma~icaratesigma~ The standard deviation of the scan rate determined from
  iras_clock_angle_rate_sigma~icaratesigma~variations in values from the gyro.
  iras_clock_angle~iclockang~ The satellite viewing angle projected onto the plane
  iras_clock_angle~iclockang~perpedicular to the Sun- line, measured from ecliptic
  iras_clock_angle~iclockang~North, clockwise as viewed from the Sun.  This is the same
  iras_clock_angle~iclockang~direction as the IRAS orbital motion.
  iras_clock_angle_rate~iclockangrat~ The average time rate of change of the clock angle during
  iras_clock_angle_rate~iclockangrat~a scan.
  iras_clock_angle_range~iclockangrng~ The change in the clock angle during the elapsed time of
  iras_clock_angle_range~iclockangrng~the scan.
  software_icon_file_spec~iconfilespec~The software_icon_file_spec element supplies the name of an image file
  software_icon_file_spec~iconfilespec~in GIF format that contains the icon that represents a particular tool.
  ict_despike_threshold~ictdspkthrsh~ The ict_despike_threshold (integer cosine transform despike threshold)
  ict_despike_threshold~ictdspkthrsh~element indicates the threshold value at which despiking occurs.
  ict_despike_threshold~ictdspkthrsh~Despiking is used as a pre-processing step to the Integer Cosine
  ict_despike_threshold~ictdspkthrsh~Transform in order to minimize the effects of radiation-induced noise
  ict_despike_threshold~ictdspkthrsh~on compression efficiency. This element is Galileo Solid State
  ict_despike_threshold~ictdspkthrsh~Imaging-specific.
  ict_quantization_step_size~ictqntstpsz~ The ict_quantization_step_size (integer cosine transform quantization
  ict_quantization_step_size~ictqntstpsz~step size) element provides the integer value by which the ICT
  ict_quantization_step_size~ictqntstpsz~transform is divided.  The greater the step-size/compression, the
  ict_quantization_step_size~ictqntstpsz~greater the data loss.
  ict_zigzag_pattern~ictzzgptrn~ The ict_zigzag_pattern element provides the name of the Integer Cosine
  ict_zigzag_pattern~ictzzgptrn~Transform zigzag pattern used to rearrange the transform. For Galileo,
  ict_zigzag_pattern~ictzzgptrn~the valid values are: ZIGZAG or ALT.
  indexed_file_name~idxfilename~The INDEXED_FILE_NAME element is a string (or set of strings)
  indexed_file_name~idxfilename~identifying the files included in an index table on an archive volume.
  indexed_file_name~idxfilename~The element is used in the label for a volume index table.  The value
  indexed_file_name~idxfilename~may include a directory path.  The usage of INDEXED_FILE_NAME may vary
  indexed_file_name~idxfilename~based on the value of the INDEX_TYPE element in the index label.
  indexed_file_name~idxfilename~ 
  indexed_file_name~idxfilename~Note:  For Mars Observer, some volume indicies have INDEX_TYPE =
  indexed_file_name~idxfilename~SINGLE, and the value of INDEXED_FILE_NAME is a set of wildcard strings
  indexed_file_name~idxfilename~matching the product file names on the volume being indexed.  Other
  indexed_file_name~idxfilename~indicies may have INDEX_TYPE = CUMULATIVE, and the value of
  indexed_file_name~idxfilename~INDEXED_FILE_NAME is a list of file names identifying the SINGLE
  indexed_file_name~idxfilename~index files which were appended together to create the CUMULATIVE index.
  image_id~imageid~The image_id element is used to identify an image and
  image_id~imageid~typically consists of a sequence of characters representing
  image_id~imageid~1) a routinely occurring measure, such as revolution number,
  image_id~imageid~2) a letter identifying the spacecraft, target, or camera,
  image_id~imageid~and 3) a representation of a count within the measure, such
  image_id~imageid~as picture number within a given revolution.
  image_id~imageid~Example:
  image_id~imageid~Mariner 9 - Levanthal Identifier - (orbit, camera, pic #,
  image_id~imageid~            total # of pics in orbit)
  image_id~imageid~Viking Orbiter - (orbit #, sc, pic # (FSC/16)),
  image_id~imageid~Viking Lander - (sc, camera, mars doy, diode (filter),
  image_id~imageid~                 pic # for that day),
  image_id~imageid~Voyager - (pic # for encounter, FDS for cruise)
  image_key_id~imagekeyid~The image_key_id element provides a shorthand
  image_key_id~imagekeyid~identifier for an image which is unique for a given
  image_key_id~imagekeyid~spacecraft. The image_key_id and spacecraft_id together
  image_key_id~imagekeyid~provide a unique identifier for any image.  The
  image_key_id~imagekeyid~contents of image_key_id may be any common identifier
  image_key_id~imagekeyid~of an image, but it is suggested that one of the
  image_key_id~imagekeyid~following be used:  1) image_id (pic_no), 2)
  image_key_id~imagekeyid~image_number (FSC), 3) spacecraft_clock_count (FDS).
  image_key_id~imagekeyid~Note:   Guaranteeing uniqueness may require
  image_key_id~imagekeyid~modification of the selected common identifier and is
  image_key_id~imagekeyid~the responsibility of the  data supplier. For example,
  image_key_id~imagekeyid~in the case where an image was retransmitted, an
  image_key_id~imagekeyid~alphabetic character could be appended. When unique
  image_key_id~imagekeyid~identifiers are not supplied, PDS will assign a simple
  image_key_id~imagekeyid~numeric identifier as the image_key_id. This identifier
  image_key_id~imagekeyid~will range from 1 to the number of images associated
  image_key_id~imagekeyid~with the specified spacecraft.
  image_number~imagenum~The image_number element is a value obtained from the
  image_number~imagenum~spacecraft_clock_start_count. The image number is another
  image_number~imagenum~commonly used identifier for an image.
  image_number~imagenum~Example:
  image_number~imagenum~Viking - Frame Start Count (FSC)
  image_number~imagenum~Voyager - Flight Data Subsystem (FDS) clock count
  image_number~imagenum~          (integer 7 digit)
  image_observation_type~imageobstype~The image_observation_type element identifies the type or
  image_observation_type~imageobstype~purpose of an observation that may be associated with an
  image_observation_type~imageobstype~image. Image observation types include limb, black sky,
  image_observation_type~imageobstype~spacecraft calibration, or other image attribute that may be
  image_observation_type~imageobstype~used for identification. Observation types should  not
  image_observation_type~imageobstype~include features, regions, or standard target names.
  image_time~imagetime~The image_time element provides the spacecraft event time at
  image_time~imagetime~the time of frame acquisition. This should be represented in
  image_time~imagetime~UTC system format.
  image_time~imagetime~Formation rule: YYYY-MM-DDThh:mm:ss[.fff]
  important_instrument_parms~impinstparms~The important_instrument_parameters element provides the
  important_instrument_parms~impinstparms~number of instrument parameters which are required to derive
  important_instrument_parms~impinstparms~a particular data set parameter.  This value depends partly
  important_instrument_parms~impinstparms~on the particular characteristics of the instruments
  important_instrument_parms~impinstparms~providing the instrument parameters.  For example, in the
  important_instrument_parms~impinstparms~case of Voyager instruments, the data set parameter PLASMA
  important_instrument_parms~impinstparms~BETA may be derived from the following set of instrument
  important_instrument_parms~impinstparms~parameters:  ELECTRON RATE, ION RATE, MAGNETIC FIELD
  important_instrument_parms~impinstparms~COMPONENT.  In that case, the value of the
  important_instrument_parms~impinstparms~important_instrument_parameters element is 3.
  incidence_angle~incidang~The incidence_angle element provides a measure of the
  incidence_angle~incidang~lighting condition at the intercept point.  Incidence angle
  incidence_angle~incidang~is the angle between the local vertical at the intercept
  incidence_angle~incidang~point (surface) and a vector from the intercept point to
  incidence_angle~incidang~the sun.
  incidence_angle~incidang~The incidence_angle varies from 0 degrees when the
  incidence_angle~incidang~intercept point coincides with the sub_solar point to 90
  incidence_angle~incidang~degrees when the intercept point is at the terminator
  incidence_angle~incidang~(i.e., in the shadowed or dark portion of the target body).
  incidence_angle~incidang~ Thus, higher values of incidence_angle indicate the
  incidence_angle~incidang~existence of a greater number of surface shadows.
  incidence_angle~incidang~Note:  In PDS labels for Magellan's altimetry and
  incidence_angle~incidang~radiometry products, incidence_angle is defined as the
  incidence_angle~incidang~value of the angle between the local vertical and the
  incidence_angle~incidang~spacecraft direction, measured at the center of the
  incidence_angle~incidang~radiometer footprint at rad_spacecraft_epoch_time.
  index_type~indextype~ The INDEX_TYPE element identifies the type of an index
  index_type~indextype~table that describes an archive volume.  It is used in the
  index_type~indextype~label for a volume index table.  In general, the two
  index_type~indextype~allowable index types are SINGLE, meaning that every row in
  index_type~indextype~the index table describes a file on the current volume;
  index_type~indextype~CUMULATIVE, meaning that every row in the index table
  index_type~indextype~describes a file residing on the current volume or a
  index_type~indextype~previous volume in the volume set.
  instrument_calibration_desc~instcalibd~The instrument_calibration_desc element explains the
  instrument_calibration_desc~instcalibd~method of calibrating an instrument and identifies
  instrument_calibration_desc~instcalibd~reference documents which explain in detail the calibration
  instrument_calibration_desc~instcalibd~of the instrument.
  instrument_calibration_desc~instcalibd~As an example, this element would explain whether the
  instrument_calibration_desc~instcalibd~calibration was time-independent (i.e., a single algorithm
  instrument_calibration_desc~instcalibd~was used) or time-dependent and whether the calibration was
  instrument_calibration_desc~instcalibd~performed in-flight or in a laboratory.
  instrument_desc~instd~The instrument_desc element describes a given
  instrument_desc~instd~instrument.
  instrument_formatted_desc~instfmtd~The instrument_formatted_desc element contains the formatted
  instrument_formatted_desc~instfmtd~instrument descriptions. These descriptions represent the
  instrument_formatted_desc~instfmtd~information collected for the PDS Version 1.0 instrument
  instrument_formatted_desc~instfmtd~model and were created by extracting instrument information
  instrument_formatted_desc~instfmtd~from several tables in the catalog data base.  These
  instrument_formatted_desc~instfmtd~descriptions represent an archive since the tables have been
  instrument_formatted_desc~instfmtd~eliminated as part of the catalog streamlining task.
  instrument_height~instheight~The instrument_height element provides the physical height
  instrument_height~instheight~of an instrument.
  instrument_host_desc~insthostd~The instrument_host_desc data element describes the
  instrument_host_desc~insthostd~spacecraft or earthbase from which particular instrument
  instrument_host_desc~insthostd~measurements were taken.  For spacecraft, this description
  instrument_host_desc~insthostd~addresses the complement of instruments carried, the
  instrument_host_desc~insthostd~on-board communications and data processing equipment, the
  instrument_host_desc~insthostd~method of stabilization, the source of power and the
  instrument_host_desc~insthostd~capabilities or limitations of the spacecraft design which
  instrument_host_desc~insthostd~are related to data-taking activities.  The description may
  instrument_host_desc~insthostd~be a synopsis of available mission documentation.
  instrument_host_id~insthostid~The instrument_host_id element provides a unique identifier
  instrument_host_id~insthostid~for the host where an instrument is located.  This host can be either a
  instrument_host_id~insthostid~spacecraft or an earth base (e.g., and observatory or laboratory on the
  instrument_host_id~insthostid~earth).  Thus, the instrument_host_id element can contain values which
  instrument_host_id~insthostid~are either spacecraft_id values or earth_base_id values.
  instrument_host_name~insthostname~The instrument_host_name element provides the full name of
  instrument_host_name~insthostname~the host on which an instrument is based.  This host can be
  instrument_host_name~insthostname~either a spacecraft or an earth base.  Thus, the
  instrument_host_name~insthostname~instrument_host_name element can contain values which are
  instrument_host_name~insthostname~either spacecraft_name values or earth_base_name values.
  instrument_host_type~insthosttype~The instrument_host_type element provides the type of host
  instrument_host_type~insthosttype~on which an instrument is based.  For example, if the
  instrument_host_type~insthosttype~instrument is located on a spacecraft, the
  instrument_host_type~insthosttype~instrument_host_type element would have the value
  instrument_host_type~insthosttype~SPACECRAFT.
  instrument_id~instid~The instrument_id element provides an
  instrument_id~instid~abbreviated name or acronym which identifies an instrument.
  instrument_id~instid~Note that the instrument_id is not a unique
  instrument_id~instid~identifier for a given instrument.  Note also that the
  instrument_id~instid~associated instrument_name element provides the full name
  instrument_id~instid~of the instrument.
  instrument_id~instid~Example values:  IRTM (for Viking Infrared Thermal Mapper),
  instrument_id~instid~PWS (for plasma wave spectrometer).
  instrument_length~instlength~The instrument_length element provides the physical length
  instrument_length~instlength~of an instrument.
  instrument_mass~instmass~The instrument_mass element provides the mass of an
  instrument_mass~instmass~instrument.
  instrument_manufacturer_name~instmfgname~The instrument_manufacturer_name element identifies the
  instrument_manufacturer_name~instmfgname~manufacturer of an instrument.
  instrument_mode_desc~instmoded~The instrument_mode_desc element describes the
  instrument_mode_desc~instmoded~instrument mode which is identified by the
  instrument_mode_desc~instmoded~instrument_mode_id element.
  instrument_mode_id~instmodeid~The instrument_mode_id element provides an
  instrument_mode_id~instmodeid~instrument-dependent designation of operating mode.  This
  instrument_mode_id~instmodeid~may be simply a number, letter or code, or a word such as
  instrument_mode_id~instmodeid~`normal,' `full resolution,' `near encounter,' or
  instrument_mode_id~instmodeid~`fixed grating.'
  instrument_mounting_desc~instmountd~The instrument_mounting_desc element describes the
  instrument_mounting_desc~instmountd~mounting of an instrument (on a platform on spacecraft or
  instrument_mounting_desc~instmountd~a mounting at a lab) and the orientation of the
  instrument_mounting_desc~instmountd~instrument with respect to the platform.
  instrument_name~instname~The instrument_name element provides the full name of an
  instrument_name~instname~instrument.
  instrument_name~instname~Note that the associated instrument_id element
  instrument_name~instname~provides an abbreviated name or acronym for the instrument.
  instrument_name~instname~Example values:  FLUXGATE MAGNETOMETER, NEAR_INFRARED
  instrument_name~instname~MAPPING SPECTROMETER.
  institution_name~instnname~The institution_name element identifies a university,
  institution_name~instnname~research center, or NASA center.
  instrument_parameter_name~instparmname~The instrument_parameter_name element provides the name of
  instrument_parameter_name~instparmname~the data parameter which was measured by an instrument.
  instrument_parameter_name~instparmname~As an example, the instrument_parameter_name value could be
  instrument_parameter_name~instparmname~ELECTRIC FIELD COMPONENT.  It is intended that the
  instrument_parameter_name~instparmname~instrument_parameter_name element provide the name of the
  instrument_parameter_name~instparmname~rawest measured value which has some physical significance.
  instrument_parameter_name~instparmname~ Thus, for example, while the detector of an instrument may
  instrument_parameter_name~instparmname~actually record voltage differences, the electric field
  instrument_parameter_name~instparmname~component which is proportional to those differences is
  instrument_parameter_name~instparmname~considered to be the instrument parameter.
  instrument_parameter_name~instparmname~Note that the associated
  instrument_parameter_name~instparmname~data_set_or_inst_parm_desc element
  instrument_parameter_name~instparmname~describes the measured parameter.
  instrument_parameter_ranges~instparmrngs~The instrument_parameter_ranges element provides the number of instrument
  instrument_parameter_ranges~instparmrngs~parameter ranges for a given instrument.
  instrument_parameter_unit~instparmunit~The instrument_parameter_unit element specifies the unit of
  instrument_parameter_unit~instparmunit~measure of associated instrument parameters.
  instrument_power_consumption~instpwrcnsmp~The instrument_power_consumption element provides power
  instrument_power_consumption~instpwrcnsmp~consumption information for an instrument.
  instrument_power_consumption~instpwrcnsmp~Note that instrument_power_consumption may vary with
  instrument_power_consumption~instpwrcnsmp~different modes of instrument operation.
  instrument_serial_number~instserlnum~The instrument serial number element provides the
  instrument_serial_number~instserlnum~manufacturer's serial number assigned to an instrument.
  instrument_serial_number~instserlnum~This number may be used to uniquely identify a particular
  instrument_serial_number~instserlnum~instrument for tracing its components or determining its
  instrument_serial_number~instserlnum~calibration history, for example.
  instrument_type~insttype~The instrument_type element identifies the type of an
  instrument_type~insttype~instrument.
  instrument_type~insttype~Example values:  POLARIMETER, RADIOMETER, REFLECTANCE
  instrument_type~insttype~SPECTROMETER, VIDICON CAMERA.
  instrument_width~instwidth~The instrument_width element provides the physical width of
  instrument_width~instwidth~an instrument.
  interchange_format~interchngfmt~The interchange_format element represents the manner in
  interchange_format~interchngfmt~which data items are stored.  Example values: BINARY,
  interchange_format~interchngfmt~ASCII.
  intercept_point_latitude~intrcptlat~ The intercept_point_latitude element provides the latitude of a point
  intercept_point_latitude~intrcptlat~on the body surface.  This intercept point can describe the point at
  intercept_point_latitude~intrcptlat~which lighting geometry is calculated or the point at which the target
  intercept_point_latitude~intrcptlat~body resolution is calculated.
  intercept_point_line~intrcptline~ The intercept_point_line element provides the instrument line location
  intercept_point_line~intrcptline~of a point on the body surface.  This intercept point can describe the
  intercept_point_line~intrcptline~point at which lighting geometry is calculated or the point at which
  intercept_point_line~intrcptline~the target body resolution is calculated.
  intercept_point_longitude~intrcptlon~ The intercept_point_longitude element provides the longitude of a
  intercept_point_longitude~intrcptlon~point on the body surface.  This intercept point can describe the point
  intercept_point_longitude~intrcptlon~at which lighting geometry is calculated or the point at which the
  intercept_point_longitude~intrcptlon~target body resolution is calculated.  Value is in west longitude for
  intercept_point_longitude~intrcptlon~Galileo
  intercept_point_line_sample~intrcptsamp~The intercept_point_line_sample element provides the instrument sample
  intercept_point_line_sample~intrcptsamp~location of a point on the body surface.  This intercept point can
  intercept_point_line_sample~intrcptsamp~describe the point at which lighting geometry is calculated or the
  intercept_point_line_sample~intrcptsamp~point at which the target body resolution is calculated.
  invalid_constant~invalidconst~The invalid_constant element supplies the value used when the
  invalid_constant~invalidconst~received data were out of the legitimate range of values.
  invalid_constant~invalidconst~Note:  For PDS and Mars Observer applications -- because of
  invalid_constant~invalidconst~the unconventional data type of this data element, the
  invalid_constant~invalidconst~element should appear in labels only within an explicit
  invalid_constant~invalidconst~object, i.e. anywhere between an 'OBJECT =' and an
  invalid_constant~invalidconst~'END_OBJECT'.
  inverted_clock_state_flag~invrtclkstfl~The inverted_clock_state element indicates whether a clock signal was
  inverted_clock_state_flag~invrtclkstfl~inverted.
  inventory_special_order_note~invspcordnt~The inventory_special_order_note element is a text field
  inventory_special_order_note~invspcordnt~that provides information on special orders that can be
  inventory_special_order_note~invspcordnt~placed for a given data set collection or data set.
  iras_hcon~irashcon~ HCON is hours-confirmation.  In order to maximize the
  iras_hcon~irashcon~reliability of the IRAS observations, the satellite
  iras_hcon~irashcon~scanning strategy was designed so that a piece of the sky
  iras_hcon~irashcon~would be re-observed on timescales of hours (generally one
  iras_hcon~irashcon~orbit of 103 minutes).  Three hours-confirmed surveys,
  iras_hcon~irashcon~designated HCONs 1, 2 and 3 respectivley, of the sky were
  iras_hcon~irashcon~made by IRAS over the course of its mission.  HCON 1 and
  iras_hcon~irashcon~2's observations were interleaved on timescales of weeks.
  iras_hcon~irashcon~HCON 3 consists of all scans after SOP 426, inclusive.(See
  iras_hcon~irashcon~Beichman et al. (1989) for further information.)
  item_bits~itembits~The item_bits element indicates the number of bits
  item_bits~itembits~allocated for a particular bit data item.
  item_bits~itembits~Note:  In the PDS, the item_bits element is used when
  item_bits~itembits~the items element specifies multiple occurrences of
  item_bits~itembits~an implied item within a BIT_COLUMN object definition.
  item_bytes~itembytes~The item_bytes data element represents the size in bytes of
  item_bytes~itembytes~an item within a data object such as a column.
  item_bytes~itembytes~Note:  In the PDS, the term item_bytes is distinguished
  item_bytes~itembytes~from the term bytes because both elements may appear in a
  item_bytes~itembytes~single data object definition (e.g., a label) and refer to
  item_bytes~itembytes~different parts of the data object.  In an object such as a
  item_bytes~itembytes~column, bytes represents the size of the column.  Should the
  item_bytes~itembytes~column be split into equal items, item_bytes would represent
  item_bytes~itembytes~the size of each item.  For fuller explanation of the use of
  item_bytes~itembytes~these data elements, please refer to the PDS Data
  item_bytes~itembytes~Preparation Workbook.
  item_offset~itemoffset~The item_offset data element indicates the number of bytes
  item_offset~itemoffset~from the start of one item to the start of the next item in
  item_offset~itemoffset~any ASCII column or array.
  items~items~The items element defines the number of multiple, identical
  items~items~occurrences of an single object, such as a column.
  items~items~See also:  repetitions.
  items~items~Note:  In the PDS, the data element ITEMS is used for
  items~items~multiple occurrences of a single object, such as a column.
  items~items~REPETITIONS is used for multiple occurrences of a repeating
  items~items~group of objects, such as a container.  For a fuller
  items~items~description of the use of these data elements, please refer
  items~items~to the Standards Reference.
  journal_name~journalname~The journal_name element identifies, where applicable, the
  journal_name~journalname~published work (e.g., journal or report) which contains a
  journal_name~journalname~reference document.
  jpl_press_release_id~jplpressid~This element describes the JPL press release id for a data
  jpl_press_release_id~jplpressid~product associated with the given data product.
  kernel_type~kerneltype~The kernel_type data element identifies the specific
  kernel_type~kerneltype~kernel of ancillary data produced within the SPICE system.
  keyword_default_value~kwddefault~The keyword_default_value element is used to initialize a
  keyword_default_value~kwddefault~template keyword value to a default value during
  keyword_default_value~kwddefault~construction of templates.  When filling out templates, the
  keyword_default_value~kwddefault~data supplier provides a value for all keywords except
  keyword_default_value~kwddefault~those which have a default value.
  keyword_value_help_text~kwdhelptxt~The keyword_value_help_text element provides text which
  keyword_value_help_text~kwdhelptxt~describes the information required from the data supplier
  keyword_value_help_text~kwdhelptxt~to assign a value to a template keyword.
  label_records~labelrecords~The label_records element indicates the number of physical
  label_records~labelrecords~file records that contain only label information.   The
  label_records~labelrecords~number of data records in a file is determined by
  label_records~labelrecords~subtracting the value of label_records from the value of
  label_records~labelrecords~file_records.
  label_records~labelrecords~Note:  In the PDS, the use of label_records along
  label_records~labelrecords~with other file-related data elements is fully
  label_records~labelrecords~described in the Standards Reference.
  last_image_time~lastimgt~The last_image_time element indicates the start_time (or
  last_image_time~lastimgt~image_time) that appears in the label of the last image on
  last_image_time~lastimgt~an archive medium.
  last_name~lastname~The last_name element provides the last name (surname) of an
  last_name~lastname~individual.
  last_product_id~lastprodid~The last_product_id data element indicates the product_id
  last_product_id~lastprodid~that appears in the label of the last data product on an
  last_product_id~lastprodid~archive medium.
  latitude~lat~For a Planetocentric, body-fixed, rotating coordinate system, latitude
  latitude~lat~is defined as:  The angle between the equatorial plane and a vector
  latitude~lat~connecting the point of interest and the origin of the planetocentric
  latitude~lat~coordinate system.  Positive in the hemisphere north of the equator
  latitude~lat~(i.e., hemisphere to the north of the solar system invariant plane) and
  latitude~lat~negative in the southern hemisphere.
  latitude~lat~ 
  latitude~lat~For a Planetographic, body-fixed, rotating coordinate system, latitude
  latitude~lat~is defined as:  The angle between the equatorial plane and a vector
  latitude~lat~through the point of interest that is normal to a biaxial ellipsoid
  latitude~lat~reference surface.  Positive in the hemisphere north of the equator
  latitude~lat~(i.e., hemisphere to the north of the solar system invariant plane) and
  latitude~lat~negative in the southern hemisphere.  Note that with a non-zero polar
  latitude~lat~flattening, the vector does not intersect the coordinate system origin,
  latitude~lat~except at the equator and the poles.
  latitude~lat~ 
  latitude~lat~See coordinate_system_name, coordinate_system_type and the PDS Carto-
  latitude~lat~graphic Standards in the PDS Standards Reference V3.2 for further
  latitude~lat~details.
  launch_date~launchdate~The launch_date element identifies the date of launch of a
  launch_date~launchdate~spacecraft or a spacecraft_carrying vehicle.
  launch_date~launchdate~Formation rule:  YYYY-MM-DD
  lens_temperature~lenstemp~The lens_temperature element provides the temperature of
  lens_temperature~lenstemp~the lens in degrees kelvin at the time the observation was
  lens_temperature~lenstemp~made.
  light_source_distance~lightsrcdist~The light_source_distance element provides the distance
  light_source_distance~lightsrcdist~from the target body center and secondary light source
  light_source_distance~lightsrcdist~center.
  light_source_name~lightsrcname~The light_source_name element provides the name of the
  light_source_name~lightsrcname~light source used in observations when it is not the Sun.
  light_source_name~lightsrcname~Note:  For the Clementine Mission, the light source is the
  light_source_name~lightsrcname~Earth when making lunar observations, and the Moon when
  light_source_name~lightsrcname~making Earth observations.
  limb_angle~limbang~The limb_angle element provides the value of the angle
  limb_angle~limbang~between the center of an instrument's field of view and the
  limb_angle~limbang~nearest point on the lit limb of the target body.
  limb_angle~limbang~Limb_angle values are positive off_planet and negative
  limb_angle~limbang~on_planet.
  line_display_direction~linedspdir~The line_display_direction element is the preferred orientation of lines
  line_display_direction~linedspdir~within an image for viewing on a display device.  The default value is
  line_display_direction~linedspdir~down, meaning lines are viewed top to bottom on the display.
  line_display_direction~linedspdir~See also SAMPLE_DISPLAY_DIRECTION.
  line_display_direction~linedspdir~ 
  line_display_direction~linedspdir~Note: The image rotation elements such as TWIST_ANGLE,
  line_display_direction~linedspdir~      CELESTIAL_NORTH_CLOCK_ANGLE, and BODY_POLE_CLOCK_ANGLE are all
  line_display_direction~linedspdir~      defined under the assumption that the image is displayed in its
  line_display_direction~linedspdir~      preferred orientation.
  line_exposure_duration~lineexpdur~The line_exposure_duration data element indicates the time
  line_exposure_duration~lineexpdur~elapsed during the aquisition of one image line of data.
  line_first_pixel~linefirstpix~The line_first_pixel element provides the line index for
  line_first_pixel~linefirstpix~the first pixel that was physically recorded at the
  line_first_pixel~linefirstpix~beginning of the image array.
  line_first_pixel~linefirstpix~Note:  In the PDS, for a fuller explanation on
  line_first_pixel~linefirstpix~the use of this data element in the Image Map Projection
  line_first_pixel~linefirstpix~Object, please refer to the PDS Standards Reference.
  line_last_pixel~linelastpix~The line_last_pixel element provides the line index for the
  line_last_pixel~linelastpix~last pixel that was physically recorded at the end of the
  line_last_pixel~linelastpix~image array.
  line_last_pixel~linelastpix~Note:  In the PDS, for a fuller explanation on the use of
  line_last_pixel~linelastpix~this data element in the Image Map Projection Object, please
  line_last_pixel~linelastpix~refer to the PDS Standards Reference.
  line_prefix_bytes~linepfxbytes~The line_prefix_bytes element indicates the number of
  line_prefix_bytes~linepfxbytes~non-image bytes at the beginning of each line. The value
  line_prefix_bytes~linepfxbytes~must represent an integral number of bytes.
  line_prefix_structure~linepfxstruc~The line_prefix_structure element indicates a pointer to a
  line_prefix_structure~linepfxstruc~file containing a definition of the structure of the
  line_prefix_structure~linepfxstruc~line prefix bytes.
  line_prefix_structure~linepfxstruc~Note:  In the PDS this data element is obsolete.  It is kept
  line_prefix_structure~linepfxstruc~in the data dictionary for historical purposes to allow data
  line_prefix_structure~linepfxstruc~validation software to function.  According to current
  line_prefix_structure~linepfxstruc~standards, the structures of prefix and suffix data are
  line_prefix_structure~linepfxstruc~illustrated through the use of the table object.
  line_projection_offset~lineprojoff~The line_projection_offset element  provides the line
  line_projection_offset~lineprojoff~offset value of the map projection origin position from
  line_projection_offset~lineprojoff~the line and sample 1,1 (line and sample 1,1 is considered
  line_projection_offset~lineprojoff~the upper left corner of the digital array).  Note that the
  line_projection_offset~lineprojoff~positive direction is to the right and down.
  lines~lines~The lines element indicates the total number of data
  lines~lines~instances along the vertical axis of an image.
  lines~lines~Note:  In PDS label convention, the number of lines is
  lines~lines~stored in a 32-bit integer field.  The minimum value of 0
  lines~lines~indicates no data received.
  line_samples~linesamples~The line_samples element indicates the total number of data
  line_samples~linesamples~instances along the horizontal axis of an image.
  line_suffix_bytes~linesfxbytes~The line_suffix_bytes element indicates the number of
  line_suffix_bytes~linesfxbytes~non-image bytes at the end of each line. This value must be
  line_suffix_bytes~linesfxbytes~an integral number of bytes.
  line_suffix_structure~linesfxstruc~The line_suffix_structure element indicates a pointer to a
  line_suffix_structure~linesfxstruc~file containing a definition of the structure of the
  line_suffix_structure~linesfxstruc~line suffix bytes.
  line_suffix_structure~linesfxstruc~Note:  In the PDS this data element is obsolete.  It is kept
  line_suffix_structure~linesfxstruc~in the data dictionary for historical purposes to allow data
  line_suffix_structure~linesfxstruc~validation software to function.  According to current
  line_suffix_structure~linesfxstruc~standards, the structures of prefix and suffix data are
  line_suffix_structure~linesfxstruc~illustrated through the use of the table object.
  light_flood_state_flag~litefldstflg~The light_flood_state_flag element indicates the mode (on
  light_flood_state_flag~litefldstflg~or off) of light flooding for an instrument.
  light_source_incidence_angle~litsrcincang~The light_source_incidence_angle element provides a measure
  light_source_incidence_angle~litsrcincang~of the lighting condition at the intercept point.
  light_source_incidence_angle~litsrcincang~Incidence angle is the angle between the local vertical at
  light_source_incidence_angle~litsrcincang~intercept (surface) point and a vector from the intercept
  light_source_incidence_angle~litsrcincang~point to the light source.
  light_source_phase_angle~litsrcphsang~The light_source_phase_angle element provides a measure of
  light_source_phase_angle~litsrcphsang~the relationship between the spacecraft viewing position
  light_source_phase_angle~litsrcphsang~and the light source.  Light_source_phase_angle is defined
  light_source_phase_angle~litsrcphsang~as the angle between a vector from the intercept point to
  light_source_phase_angle~litsrcphsang~the light source and a vector from the intercept point to
  light_source_phase_angle~litsrcphsang~the spacecraft.
  local_hour_angle~localhourang~The local_hour_angle element provides a measure of the
  local_hour_angle~localhourang~instantaneous apparent sun position at the subspacecraft
  local_hour_angle~localhourang~point.  The local_hour_angle is the angle between the
  local_hour_angle~localhourang~extension of the vector from the Sun to the target body and
  local_hour_angle~localhourang~the vector projection on the target body's ecliptic plane
  local_hour_angle~localhourang~of a vector from the target body's planetocentric center to
  local_hour_angle~localhourang~the observer (usually, the spacecraft).
  local_hour_angle~localhourang~This angle is measured in a counterclockwise direction when
  local_hour_angle~localhourang~viewed from north of the ecliptic plane.  It may be
  local_hour_angle~localhourang~converted from an angle in degrees to a local time, using
  local_hour_angle~localhourang~the conversion of 15 degrees per hour, for those planets
  local_hour_angle~localhourang~for which the rotational direction corresponds with the
  local_hour_angle~localhourang~direction of measure of the angle.
  local_time~localtime~The local_time element provides the local time of day at
  local_time~localtime~the center of the field of view of an instrument, measured
  local_time~localtime~in local hours from midnight.
  local_time~localtime~A local hour is defined as one twenty_fourth of a local
  local_time~localtime~solar day.
  logical_volumes~logicalvols~The logical_volumes element is an integer indicating the
  logical_volumes~logicalvols~number of logical volumes in the given volume.  If it is
  logical_volumes~logicalvols~missing, it has a default value of 1.
  logical_volume_path_name~logvolpathnm~The logical_volume_path_name element is a character string
  logical_volume_path_name~logvolpathnm~or set of character strings giving the root directory path
  logical_volume_path_name~logvolpathnm~for each logical volume.  If missing, the volume begins in
  logical_volume_path_name~logvolpathnm~the root directory as usual.
  longitude~lon~For a Planetocentric, body-fixed, rotating coordinate system, longitude
  longitude~lon~is defined as:  The angle increasing eastward between the prime meridian
  longitude~lon~and the vector from the coordinate system origin to the point of in-
  longitude~lon~terest, projected into the equatorial plane.  This is a right-handed
  longitude~lon~coordinate system.
  longitude~lon~ 
  longitude~lon~For a Planetographic, body-fixed, rotating coordinate system, longitude
  longitude~lon~is defined as:  The angle between the prime meridian and the vector
  longitude~lon~from the coordinate system origin to the point of interest, projected
  longitude~lon~into the equatorial plane.  Planetographic longitudes are defined to
  longitude~lon~increase with time for a distant observer.  Thus, they increase to the
  longitude~lon~west for prograde rotators, and to the east for retrograde rotators.
  longitude~lon~ 
  longitude~lon~For the Earth, Moon and Sun, PDS also supports the traditional use
  longitude~lon~of the range (-180,180)
  longitude~lon~ 
  longitude~lon~Note:  Longitudes are measured in the direction of rotation for all
  longitude~lon~planetary rings.  See ring_longitude, minimum_ring_longitude, maximum_
  longitude~lon~ring_longitude, b1950_ring_longitude, minimum_b1950_ring_longitude and
  longitude~lon~maximum_b1950_ring_longitude.
  lowest_detectable_opacity~lowdetopac~ The lowest_detectable_opacity element indicates the
  lowest_detectable_opacity~lowdetopac~sensitivity of a ring occultation data set to faint rings.
  lowest_detectable_opacity~lowdetopac~It specifies the normal ring opacity corresponding to a
  lowest_detectable_opacity~lowdetopac~signal one standard deviation below the unobstructed
  lowest_detectable_opacity~lowdetopac~signal.  The value is computed assuming the data has been
  lowest_detectable_opacity~lowdetopac~re-processed to the radial resolution specified by the
  lowest_detectable_opacity~lowdetopac~reference_radial_resolution element.
  magnetic_moment~magmoment~The magnetic_moment element provides the value of the
  magnetic_moment~magmoment~magnetic moment of a target body.
  mailing_address_line~mailaddrline~The mailing_address_line element provides one line
  mailing_address_line~mailaddrline~of the mailing address of an individual or institution.
  mailing_address_line~mailaddrline~The ordering of the mailing address lines is provided by
  mailing_address_line~mailaddrline~the associated tuple_sequence_number.
  mandatory_column~mandatorycol~The mandatory_column element denotes whether an attribute
  mandatory_column~mandatorycol~may be set to a null value.  Example:  Y or N
  map_desc~mapd~The map_desc element describes the contents and
  map_desc~mapd~processing history of a given map.
  map_name~mapname~The map_name element provides the name assigned to a map,
  map_name~mapname~and typically corresponds to the name of a prominent
  map_name~mapname~feature which appears on the map.
  map_name~mapname~Note:  This element is also used within AMMOS as a unique
  map_name~mapname~identifier for decommutation maps.
  map_number~mapnum~The map_number element provides a numeric identifier for a
  map_number~mapnum~given map.
  mapping_stop_time~mappngstoptm~The mapping_stop_time element is an alias for stop_time used
  mapping_stop_time~mappngstoptm~exclusively by AMMOS-MGN ephemeris files.
  mapping_start_time~mappngstrttm~The mapping_start_time element is an alias for start_time
  mapping_start_time~mappngstrttm~used exclusively by AMMOS-MGN ephemeris files.
  map_projection_desc~mapprojd~The map_projection_desc element describes the
  map_projection_desc~mapprojd~map_projection_type unambiguously.  It shall contain the
  map_projection_desc~mapprojd~mathematical expressions (it may even contain the source
  map_projection_desc~mapprojd~code or pseudo code, with comments) and any assumptions
  map_projection_desc~mapprojd~(e.g. the  planet is assumed spherical).  Additionally it
  map_projection_desc~mapprojd~shall describe the  planet eccentricity, the treatment of
  map_projection_desc~mapprojd~the a_axis_radius, b_axis_radius,  and c_axis_radius when
  map_projection_desc~mapprojd~the projection was created, and where the  map_scale (or
  map_projection_desc~mapprojd~map_resolution) is defined.
  map_projection_rotation~mapprojrot~The map_projection_rotation element provides the clockwise
  map_projection_rotation~mapprojrot~rotation, in degrees, of the line and sample coordinates
  map_projection_rotation~mapprojrot~with respect to the map projection origin
  map_projection_rotation~mapprojrot~(line_projection_offset, line_projection_offset)  This
  map_projection_rotation~mapprojrot~parameter is used to indicate where 'up' is in the
  map_projection_rotation~mapprojrot~projection.  For example, in a polar stereographic
  map_projection_rotation~mapprojrot~projection does the zero meridian go center to bottom,
  map_projection_rotation~mapprojrot~center to top, center to left, or center to right?  The
  map_projection_rotation~mapprojrot~polar projection is defined such that the zero meridian
  map_projection_rotation~mapprojrot~goes center to bottom. However, by rotating the map
  map_projection_rotation~mapprojrot~projection, the zero meridian can go in any direction.
  map_projection_rotation~mapprojrot~Note that 180 degrees is at the top of the North Pole and 0
  map_projection_rotation~mapprojrot~degrees is at the top of the South Pole.  For example, if 0
  map_projection_rotation~mapprojrot~degrees is at the top of the North Pole than the
  map_projection_rotation~mapprojrot~map_projection_rotation would be 180 degrees.
  map_projection_type~mapprojtype~The map_projection_type element identifies the type of
  map_projection_type~mapprojtype~projection characteristic of a given map.
  map_projection_type~mapprojtype~Example value:  ORTHOGRAPHIC.
  map_resolution~mapres~The map_resolution element identifies the scale of a given
  map_resolution~mapres~map.  Please refer to the definition for map_scale for a
  map_resolution~mapres~more complete definition.  Note that map_resolution and
  map_resolution~mapres~map_scale both define the scale of a map except that they
  map_resolution~mapres~are expressed in different units:  map_resolution is in
  map_resolution~mapres~PIXEL/DEGREE and map_scale is in KM/PIXEL.
  map_scale~mapscale~The map_scale element identifies the scale of a given map.
  map_scale~mapscale~The scale is defined as the ratio of the actual distance
  map_scale~mapscale~between two points on the surface of the target body to the
  map_scale~mapscale~distance between the corresponding points on the map.
  map_scale~mapscale~The map_scale references the scale of a map at a certain
  map_scale~mapscale~reference point or line.  Certain map projections
  map_scale~mapscale~vary in scale throughout the map.  For example, in a
  map_scale~mapscale~Mercator projection, the map_scale refers to the scale of
  map_scale~mapscale~the map at the equator.  For Conic projections, the
  map_scale~mapscale~map_scale refers to the scale at the standard parallels.
  map_scale~mapscale~For an Orthographic point, the map_scale refers to the scale
  map_scale~mapscale~at the center latitude and longitude.  The relationship
  map_scale~mapscale~between map_scale and the map_resolution element is that
  map_scale~mapscale~they both define the scale of a given map, except they are
  map_scale~mapscale~expressed in different units:  map_scale is in KM/PIXEL
  map_scale~mapscale~and map_resolution is in PIXEL/DEGREE.  Also note that one
  map_scale~mapscale~is inversely proportional to the other and that kilometers and degrees
  map_scale~mapscale~can be related given the radius of the planet:  1 degree =
  map_scale~mapscale~(2 * RADIUS * PI) / 360 kilometers.
  map_sequence_number~mapseqnum~The map_sequence_number element identifies the sequence
  map_sequence_number~mapseqnum~number of a particular series of decommutation maps.
  map_series_id~mapserid~The map_series_id element identifies a map
  map_series_id~mapserid~series (as specified by the agency which issued the map).
  map_sheet_number~mapsheetnum~The map_sheet_number element provides the sequence number
  map_sheet_number~mapsheetnum~of a map which comprises multiple sheets.
  map_type~maptype~The map_type element identifies the general type of
  map_type~maptype~information depicted on a given map.
  map_type~maptype~Example values:  GEOLOGIC, TOPOGRAPHIC, SHADED_RELIEF.
  mass~mass~The mass element provides the estimated mass of a target
  mass~mass~body.
  mass_density~massdensity~The mass_density element provides the bulk density (mass
  mass_density~massdensity~per unit volume) of a target body.  Bulk density is defined
  mass_density~massdensity~as the ratio of total mass to total volume.
  maximum_b1950_ring_longitude~maxbringlong~ The maximum_B1950_ring_longitude element specifies the
  maximum_b1950_ring_longitude~maxbringlong~maximum inertial longitude within a ring area relative to
  maximum_b1950_ring_longitude~maxbringlong~the B1950 prime meridian, rather than to the J2000 prime
  maximum_b1950_ring_longitude~maxbringlong~meridian.  The prime meridian is the ascending node of the
  maximum_b1950_ring_longitude~maxbringlong~planet's invariable plane on the Earth's mean equator of
  maximum_b1950_ring_longitude~maxbringlong~B1950.  Longitudes are measured in the direction of orbital
  maximum_b1950_ring_longitude~maxbringlong~motion along the planet's invariable plane to the ring's
  maximum_b1950_ring_longitude~maxbringlong~ascending node, and thence along the ring plane.
  maximum_b1950_ring_longitude~maxbringlong~ 
  maximum_b1950_ring_longitude~maxbringlong~Note:  For areas that cross the prime meridian, the maximum
  maximum_b1950_ring_longitude~maxbringlong~ring longitude will have a value less than the minimum ring
  maximum_b1950_ring_longitude~maxbringlong~longitude.
  maximum_brightness_temperature~maxbritetemp~The maximum_brightness_temperature element provides the
  maximum_brightness_temperature~maxbritetemp~maximum brightness temperature value measured within a given
  maximum_brightness_temperature~maxbritetemp~ set of data or a given sequence.
  maximum_brightness_temperature~maxbritetemp~Brightness temperature is the temperature of aideal
  maximum_brightness_temperature~maxbritetemp~blackbody whose radiant energy in a particular wavelength
  maximum_brightness_temperature~maxbritetemp~range is the same as that of an observed object or feature.
  maximum_channel_id~maxchnlid~The maximum_channel_id element identifies the highest channel from which
  maximum_channel_id~maxchnlid~data were obtained.  For example, the Voyager PLS instrument reported
  maximum_channel_id~maxchnlid~measurements in a number of energy/charge channels.  But not all channel
  maximum_channel_id~maxchnlid~values were reported to Earth; the maximum_channel_id element indicated
  maximum_channel_id~maxchnlid~the highest energy reported in the telemetry stream.
  maximum_column_value~maxcolval~The maximum_column_value element provides the maximum real
  maximum_column_value~maxcolval~value currently allowed by the PDS catalog for a given table
  maximum_column_value~maxcolval~element.  This value is updated when new limits are
  maximum_column_value~maxcolval~discovered.  Note that these elements are unique to a table
  maximum_column_value~maxcolval~and may have different values depending on which table the
  maximum_column_value~maxcolval~element is associated with.
  maximum_emission_angle~maxemissang~The maximum_emission_angle element provides the maximum
  maximum_emission_angle~maxemissang~emission angle value.  See emission_angle.
  maximum_instrument_exposr_dur~maxexposdur~The maximum_instrument_exposure_duration element provides
  maximum_instrument_exposr_dur~maxexposdur~the maximum possible exposure time for the instrument mode
  maximum_instrument_exposr_dur~maxexposdur~identified by the instrument_mode_id element.
  maximum_instrument_exposr_dur~maxexposdur~See instrument_exposure_duration.
  maximum~maximum~The maximum element indicates the largest value occurring
  maximum~maximum~in a given instance of the data object.
  maximum~maximum~Note:  For PDS and Mars Observer applications -- because of
  maximum~maximum~the unconventional data type of this data element, the
  maximum~maximum~element should appear in labels only within an explicit
  maximum~maximum~object, i.e. anywhere between an 'OBJECT =' and an
  maximum~maximum~'END_OBJECT'.
  maximum_incidence_angle~maxincidang~The maximum_incidence_angle element provides the maximum
  maximum_incidence_angle~maxincidang~incidence angle value.  See incidence_angle.
  maximum_instrument_parameter~maxinstparm~The maximum_instrument_parameter element provides an
  maximum_instrument_parameter~maxinstparm~instrument's maximum usefully detectable signal level for
  maximum_instrument_parameter~maxinstparm~a given instrument parameter.  This value indicates the
  maximum_instrument_parameter~maxinstparm~physical value corresponding to the maximum output of an
  maximum_instrument_parameter~maxinstparm~instrument by the instrument_parameter_name element.
  maximum_latitude~maxlat~The maximum_latitude element specifies the northernmost
  maximum_latitude~maxlat~latitude of a spatial area, such as a map, mosaic, bin,
  maximum_latitude~maxlat~feature, or region.  See latitude.
  maximum_length~maxlength~The maximum_length element supplies the maximum number of
  maximum_length~maxlength~units associated with the representation of a data element.
  maximum_limb_angle~maxlimbang~The maximum_limb_angle element provides the maximum value
  maximum_limb_angle~maxlimbang~of the limb angle within a given set of data.  See
  maximum_limb_angle~maxlimbang~limb_angle.
  maximum_local_time~maxlocaltime~The maximum_local_time element provides the maximum
  maximum_local_time~maxlocaltime~local time of day on the target body, measured in hours
  maximum_local_time~maxlocaltime~from local midnight.
  maximum_longitude~maxlon~The maximum_longitude element specifies the westernmost
  maximum_longitude~maxlon~(left_most) longitude of a spatial area, such as a map,
  maximum_longitude~maxlon~mosaic, bin, feature, or region.  See longitude.
  maximum_longitude~maxlon~Note:  The maximum longitude data element is obsolete and should no
  maximum_longitude~maxlon~longer be used.  The assumed coordinate system was planetographic for
  maximum_longitude~maxlon~prograde rotators (PDS Cartographic Standards V3.0).  See coordinate_
  maximum_longitude~maxlon~system_type, easternmost_longitude and westernmost_longitude.
  maximum_parameter~maxparm~The maximum_parameter element specifies the maximum
  maximum_parameter~maxparm~allowable value for a parameter input to a given data
  maximum_parameter~maxparm~processing program.
  maximum_parameter~maxparm~The parameter constrained by this value is identified by
  maximum_parameter~maxparm~the parameter_name element.
  maximum_phase_angle~maxphsang~The maximum_phase_angle element provides the maximum phase
  maximum_phase_angle~maxphsang~angle value.  See phase_angle.
  maximum_radial_resolution~maxradres~ The maximum_radial_resolution element indicates the
  maximum_radial_resolution~maxradres~maximum (coarsest) radial distance over which changes in
  maximum_radial_resolution~maxradres~ring properties can be detected within a data product.
  maximum_radial_sampling_interv~maxradsamint~ The maximum_radial_sampling_interval element indicates the
  maximum_radial_sampling_interv~maxradsamint~maximum radial spacing between consecutive points in a ring
  maximum_radial_sampling_interv~maxradsamint~profile.  In practice, this may be somewhat smaller than
  maximum_radial_sampling_interv~maxradsamint~the maximum_radres element because the profile
  maximum_radial_sampling_interv~maxradsamint~may be over-sampled.
  maximum_ring_longitude~maxringlong~ The maximum_ring_longitude element specifies the maximum
  maximum_ring_longitude~maxringlong~inertial longitude of a ring area relative to the prime
  maximum_ring_longitude~maxringlong~meridian.  In planetary ring systems, the prime meridian is
  maximum_ring_longitude~maxringlong~the ascending node of the planet's invariable plane on the
  maximum_ring_longitude~maxringlong~Earth's mean equator of J2000.  Longitudes are measured in
  maximum_ring_longitude~maxringlong~the direction of orbital motion along the planet's
  maximum_ring_longitude~maxringlong~invariable plane to the ring's ascending node, and thence
  maximum_ring_longitude~maxringlong~along the ring plane.
  maximum_ring_longitude~maxringlong~ 
  maximum_ring_longitude~maxringlong~Note:  For areas that cross the prime meridian, the maximum ring longi-
  maximum_ring_longitude~maxringlong~tude will have a value less than the minimum ring longitude.
  maximum_ring_longitude~maxringlong~Note:  The invariable plane of a planet is equivalent to its equatorial
  maximum_ring_longitude~maxringlong~plane for every ringed planet except Neptune.
  maximum_ring_radius~maxringrad~ The maximum_ring_radius element indicates the maximum
  maximum_ring_radius~maxringrad~(outermost) radial location of an area within a planetary
  maximum_ring_radius~maxringrad~ring system.  Radii are measured from the center of the
  maximum_ring_radius~maxringrad~planet along the nominal ring plane.
  maximum_sampling_parameter~maxsampparm~The maximum_sampling_parameter element identifies the
  maximum_sampling_parameter~maxsampparm~maximum value at which a given data item was sampled.
  maximum_sampling_parameter~maxsampparm~For example, a spectrum that was measured in the 0.4 to 3.5
  maximum_sampling_parameter~maxsampparm~micrometer spectral region would have a
  maximum_sampling_parameter~maxsampparm~maximum_sampling_parameter value of 3.5.
  maximum_sampling_parameter~maxsampparm~The sampling parameter constrained by this value is
  maximum_sampling_parameter~maxsampparm~identified by the sampling_parameter_name element.  Note
  maximum_sampling_parameter~maxsampparm~that the unit of measure for the sampling parameter is
  maximum_sampling_parameter~maxsampparm~provided by the unit element.
  maximum_slant_distance~maxslantdist~The maximum_slant_distance element provides the maximum
  maximum_slant_distance~maxslantdist~slant distance value.  See slant_distance.
  maximum_solar_band_albedo~maxsolbndalb~The maximum_solar_band_albedo element provides the maximum
  maximum_solar_band_albedo~maxsolbndalb~solar band albedo value measured within a given set of data
  maximum_solar_band_albedo~maxsolbndalb~or a given sequence.
  maximum_spectral_contrast~maxspeccontr~The maximum_spectral_contrast element provides the maximum
  maximum_spectral_contrast~maxspeccontr~value of spectral contrast within a given set of data.  See
  maximum_spectral_contrast~maxspeccontr~spectral_contrast_range.
  maximum_surface_pressure~maxsurfpres~The maximum_surface_pressure element provides the maximum
  maximum_surface_pressure~maxsurfpres~surface pressure value for the atmosphere of a given body.
  maximum_surface_temperature~maxsurftemp~The maximum_surface_temperature element provides the maximum
  maximum_surface_temperature~maxsurftemp~equatorial surface temperature value for a given body during
  maximum_surface_temperature~maxsurftemp~its year.
  maximum_wavelength~maxwave~The maximum_wavelength element identifies the maximum wavelength at which
  maximum_wavelength~maxwave~an observation can be made or was made.  For instruments, this may depend
  maximum_wavelength~maxwave~on the instrument detector or filter characteristics.  For data products,
  maximum_wavelength~maxwave~this is the effective upper limit on the wavelength detected.
  mcp_gain_mode_id~mcpgainmdid~The MCP_gain_mode_id element identifies the MCP (Micro
  mcp_gain_mode_id~mcpgainmdid~Channel Plate) gain state of an instrument.
  mean~mean~The mean element provides the average of the DN values in
  mean~mean~the image array.
  mean_orbital_radius~meanorbradi~The mean_orbital_radius element provides the mean distance
  mean_orbital_radius~meanorbradi~between the center of a solar system object and the center
  mean_orbital_radius~meanorbradi~of its primary (e.g., the primary body for a planet is the
  mean_orbital_radius~meanorbradi~Sun, while the primary body for a satellite is the planet
  mean_orbital_radius~meanorbradi~about which it orbits).
  mean_orbital_radius~meanorbradi~As the radius of an elliptical orbit varies with time, the
  mean_orbital_radius~meanorbradi~notion of mean radius allows for general, time-independent
  mean_orbital_radius~meanorbradi~comparisons between the sizes of different bodies' orbits.
  mean_radiance~meanradiance~The mean_radiance is the mean of the radiance values in a radiometrically
  mean_radiance~meanradiance~corrected product.
  mean_radius~meanradius~The mean_radius element is measured or derived using a
  mean_radius~meanradius~variety of methods. It provides, approximately, an average
  mean_radius~meanradius~of the equatorial and polar radii of the best fit spheroid
  mean_radius~meanradius~(for planets) or ellipsoid (for satellites).
  mean_reflectance~meanreflctnc~The MEAN_REFLECTANCE element represents the mean
  mean_reflectance~meanreflctnc~reflectance of an imaged area of a target body in intensity
  mean_reflectance~meanreflctnc~over flux (I over F) units.  10,000 I over F units would be
  mean_reflectance~meanreflctnc~produced by normal incidence of sunlight on a Lambert disk
  mean_reflectance~meanreflctnc~at the target-body's distance from the sun
  mean_solar_day~meansolarday~The mean_solar_day element provides the average interval
  mean_solar_day~meansolarday~required for successive transits of the Sun.  This is
  mean_solar_day~meansolarday~computed as if planets and satellites move in circular
  mean_solar_day~meansolarday~orbits about their primaries with periods as specified by
  mean_solar_day~meansolarday~the revolution_period element, and as if planets and
  mean_solar_day~meansolarday~satellites have spin axes which are perpendicular to their
  mean_solar_day~meansolarday~orbit planes.
  mean_surface_pressure~meansurfpres~The mean_surface_pressure element provides the
  mean_surface_pressure~meansurfpres~mean equatorial atmospheric pressure value at the mean
  mean_surface_pressure~meansurfpres~equatorial surface of a body, averaged over the body's
  mean_surface_pressure~meansurfpres~year.
  mean_surface_temperature~meansurftemp~The mean_surface_temperature element provides the mean
  mean_surface_temperature~meansurftemp~equatorial surface temperature of a body, averaged over the
  mean_surface_temperature~meansurftemp~body's year.
  mean_truncated_bits~meantrncbits~The MEAN_TRUNCATED_BITS element provides the mean number of
  mean_truncated_bits~meantrncbits~truncated bits/pixel.
  mean_truncated_samples~meantrncsamp~The MEAN_TRUNCATED_SAMPLES element provides the mean number
  mean_truncated_samples~meantrncsamp~of truncated pixels/line.
  measurement_atmosphere_desc~measatmd~The measurement_atmosphere_desc element describes
  measurement_atmosphere_desc~measatmd~the atmospheric conditions through which data were taken.
  measured_quantity_name~measqtyname~The measured_quantity_name element indicates the physical
  measured_quantity_name~measqtyname~phenomenon measured by a declared unit of measure.
  measured_quantity_name~measqtyname~For example, the measured quantity name for the unit
  measured_quantity_name~measqtyname~AMPERE is ELECTRIC CURRENT.
  measured_quantity_name~measqtyname~NOTE:  A table of standard units, unit ids, and measured
  measured_quantity_name~measqtyname~quantities based on those published by the Systeme
  measured_quantity_name~measqtyname~Internationale appears in the 'Units of Measurement' section
  measured_quantity_name~measqtyname~of the PSDD.  (Please refer to the table of contents for its
  measured_quantity_name~measqtyname~location.)  The values in this table's 'Measured Quantity'
  measured_quantity_name~measqtyname~column constitute the standard values for the data element
  measured_quantity_name~measqtyname~measured_quantity_name.
  measurement_source_desc~meassourced~The measurement_source_desc element describes the
  measurement_source_desc~meassourced~source of light used in a laboratory-generated data set,
  measurement_source_desc~meassourced~or the radar transmitter in the case of radar astronomy
  measurement_source_desc~meassourced~experiments.
  measurement_standard_desc~measstdd~The measurement_standard_desc element identifies the
  measurement_standard_desc~measstdd~standard object on which observations are performed in
  measurement_standard_desc~measstdd~order to calibrate an instrument.
  measurement_wave_calbrt_desc~measwvcalibd~The measurement_wave_calbrt_desc element
  measurement_wave_calbrt_desc~measwvcalibd~identifies the technique and procedure used to calibrate
  measurement_wave_calbrt_desc~measwvcalibd~wavelength.
  medium_desc~mediumd~The medium_desc element provides the textual description for
  medium_desc~mediumd~ the medium used in the distribution of an ordered data set.
  medium_format~mediumformat~The medium_format element identifies the unformatted
  medium_format~mediumformat~recording capacity or recording density of a given medium.
  medium_type~mediumtype~The medium_type element identifies the physical storage
  medium_type~mediumtype~medium for a data volume.  Examples:  CD-ROM, CARTRIDGE
  medium_type~mediumtype~TAPE.
  meteorite_location_name~meteorlocnm~The meteorite_location_name provides the name of the region
  meteorite_location_name~meteorlocnm~or geographic feature where the meteorite was found.
  meteorite_name~meteorname~The meteorite_name element provides the name that is
  meteorite_name~meteorname~assigned to a meteorite.  It is often derived from the name
  meteorite_name~meteorname~of the place or geographic feature where the meteorite was
  meteorite_name~meteorname~found.
  meteorite_sub_type~meteorsubtyp~The meteorite_sub_type element defines a subcategory of a
  meteorite_sub_type~meteorsubtyp~meteorite_type (see definition for meteorite_type). For
  meteorite_sub_type~meteorsubtyp~example, octahedrites are a subtype of iron meteorites.
  meteorite_sub_type~meteorsubtyp~Octahedrites contain 4 sets of parallel plates that
  meteorite_sub_type~meteorsubtyp~intersect with each other in a complex manner.
  meteorite_type~meteortype~The meteorite_type element defines which class a meteorite
  meteorite_type~meteortype~belongs to based on the meteorite composition and physical
  meteorite_type~meteortype~characteristics.
  method_desc~methodd~The method_desc element describes the method used to perform
  method_desc~methodd~a particular observation.
  alt_along_track_footprint_size~mgn1~ The alt_along_track_footprint_size element provides the
  alt_along_track_footprint_size~mgn1~value of along-track dimension of the Venus surface area
  alt_along_track_footprint_size~mgn1~whose mean radius, RMS slope, and reflectivity are reported
  alt_along_track_footprint_size~mgn1~in this data record. The along track dimension is chosen to
  alt_along_track_footprint_size~mgn1~be the smallest multiple of the doppler resolution of the
  alt_along_track_footprint_size~mgn1~altimeter (at this point in the spacecraft orbit) that is
  alt_along_track_footprint_size~mgn1~greater than 8 km.
  alt_partials_group~mgn10~ The alt_partials_group of the alt_footprint_longitude,
  alt_partials_group~mgn10~alt_footprint_latitude, and the derived_planetary_radius
  alt_partials_group~mgn10~with respect to the alt_spacecraft_position_vector and
  alt_partials_group~mgn10~alt_spacecraft_velocity_vector elements provides the value
  alt_partials_group~mgn10~of the partial derivatives of the footprint coordinates
  alt_partials_group~mgn10~with respect to changes in the spacecraft position and
  alt_partials_group~mgn10~velocity.
  alt_skip_factor~mgn11~ The alt_skip_factor elements provide the values of the
  alt_skip_factor~mgn11~altimeter skip factor taken from the radar burst header.
  alt_skip_factor~mgn11~alt_skip_factor[0] pertains to the measurement of
  alt_skip_factor~mgn11~raw_rad_antenna_power and alt_skip_factor[1] to
  alt_skip_factor~mgn11~raw_rad_load_power.
  alt_spacecraft_position_vector~mgn12~ The alt_spacecraft_position_vector element provides the
  alt_spacecraft_position_vector~mgn12~value of the spacecraft position at
  alt_spacecraft_position_vector~mgn12~altimetry_footprint_tdb_time, relative to the Venus center
  alt_spacecraft_position_vector~mgn12~of mass, expressed in inertial coordinates in the J2000
  alt_spacecraft_position_vector~mgn12~coordinate system.
  alt_spacecraft_velocity_vector~mgn13~ The alt_spacecraft_velocity_vector element provides the
  alt_spacecraft_velocity_vector~mgn13~spacecraft velocity at altimetry_footprint_tdb_time,
  alt_spacecraft_velocity_vector~mgn13~relative to the Venus center of mass, expressed in inertial
  alt_spacecraft_velocity_vector~mgn13~coordinates in the J2000 coordinate system.
  altimetry_footprint_tdb_time~mgn14~ The altimetry_footprint_tdb_time element provides the
  altimetry_footprint_tdb_time~mgn14~value of the ephemeris time at which the spacecraft passed
  altimetry_footprint_tdb_time~mgn14~directly over the center of the footprint. As each
  altimetry_footprint_tdb_time~mgn14~footprint is composed of data collected from several
  altimetry_footprint_tdb_time~mgn14~altimeter bursts, this epoch doesn't necessarily coincide
  altimetry_footprint_tdb_time~mgn14~with a particular burst.
  assumed_warm_sky_temperature~mgn15~ The assumed_warm_sky_temperature element provides the
  assumed_warm_sky_temperature~mgn15~value of the temperature assumed for the dominant portion
  assumed_warm_sky_temperature~mgn15~of 'sky' reflected by the radiometer footprint, including
  assumed_warm_sky_temperature~mgn15~atmospheric absorption and emission.
  atmos_correction_to_distance~mgn16~ The atmos_correction_to_distance element provides the
  atmos_correction_to_distance~mgn16~value of the correction applied to derived_planetary_radius
  atmos_correction_to_distance~mgn16~to allow for the delay of signals passing through the
  atmos_correction_to_distance~mgn16~atmosphere, calculated by the MGMOUT phase of the altimetry
  atmos_correction_to_distance~mgn16~and radiometry data reduction program.
  average_asc_node_longitude~mgn17~ The average_asc_node_longitude element provides the value
  average_asc_node_longitude~mgn17~of the angle in the xy-plane of the J2000 coordinate system
  average_asc_node_longitude~mgn17~to the ascending node of the predicted orbit.
  average_orbit_peri_tdb_time~mgn18~ The average_orbit_peri_tdb_time element provides the value
  average_orbit_peri_tdb_time~mgn18~of the periapsis time of the predicted orbit. This orbit is
  average_orbit_peri_tdb_time~mgn18~based on the elements used to generate the uplink commands
  average_orbit_peri_tdb_time~mgn18~for the current mapping pass. It represents an average over
  average_orbit_peri_tdb_time~mgn18~the entire orbit, and is not the result of post-orbit
  average_orbit_peri_tdb_time~mgn18~navigation solutions. The elements should be used for
  average_orbit_peri_tdb_time~mgn18~comparison purposes only, since they may involve large
  average_orbit_peri_tdb_time~mgn18~errors.  The predicted orbit elements are copied from the
  average_orbit_peri_tdb_time~mgn18~orbit header file of the ALT-EDR tape, or, if unavailable,
  average_orbit_peri_tdb_time~mgn18~from the orbit header file of the C-BIDR.
  average_periapsis_argument~mgn19~ The average_periapsis_argument element provides the value
  average_periapsis_argument~mgn19~of the angle in the plane of the predicted orbit from the
  average_periapsis_argument~mgn19~ascending node in the xy-plane of the J2000 coordinate
  average_periapsis_argument~mgn19~system to the periapsis.
  alt_coarse_resolution~mgn2~ The alt_coarse_resolution element provides the value of
  alt_coarse_resolution~mgn2~the altimeter coarse time resolution factor taken from the
  alt_coarse_resolution~mgn2~radar burst header in which the raw_rad_antenna_power was
  alt_coarse_resolution~mgn2~reported.
  average_planetary_radius~mgn20~ The average_planetary_radius element provides the value of
  average_planetary_radius~mgn20~the planetary radius of the radiometer footprint, used to
  average_planetary_radius~mgn20~compute rad_footprint_longitude and rad_footprint_latitude,
  average_planetary_radius~mgn20~and also surface_temperature and atmospheric corrections to
  average_planetary_radius~mgn20~surface_emissivity.
  average_semimajor_axis~mgn21~ The average_semimajor_axis element provides the value of
  average_semimajor_axis~mgn21~the semi-major axis of the predicted orbit.
  best_non_range_sharp_model_tpt~mgn22~ The best_non_range_sharp_model_tpt provides the value of
  best_non_range_sharp_model_tpt~mgn22~the theoretical echo profile, at half-baud (0.21
  best_non_range_sharp_model_tpt~mgn22~microsecond) intervals, that best approximates the peak of
  best_non_range_sharp_model_tpt~mgn22~the non_range_sharp_echo_prof array. The optimal fit is
  best_non_range_sharp_model_tpt~mgn22~made by matching best_non_range_sharp_model_tpt[i] with
  best_non_range_sharp_model_tpt~mgn22~non_range_sharp_echo_prof[i+non_range_prof_corrs_index],
  best_non_range_sharp_model_tpt~mgn22~where i is a value from 0 to 49.
  best_range_sharp_model_tmplt~mgn23~ The best_range_sharp_model_tmplt element provides the
  best_range_sharp_model_tmplt~mgn23~value of the theoretical echo profile, at one-baud (0.21
  best_range_sharp_model_tmplt~mgn23~microsecond) intervals, that best approximates the peak of
  best_range_sharp_model_tmplt~mgn23~the range_sharp_echo_profile array.  The optimal fit is
  best_range_sharp_model_tmplt~mgn23~made by matching the best_range_sharp_model_tmplt[i]
  best_range_sharp_model_tmplt~mgn23~element with the
  best_range_sharp_model_tmplt~mgn23~range_sharp_echo_profile[i+range_sharp_prof_corrs_index]
  best_range_sharp_model_tmplt~mgn23~element, where i is a value from 0 to 49.
  derived_fresnel_reflect_corr~mgn24~ The derived_fresnel_reflect_corr element provides the
  derived_fresnel_reflect_corr~mgn24~value of the derived_fresnel_reflectivity correction factor
  derived_fresnel_reflect_corr~mgn24~for diffuse scattering which is a factor by which the
  derived_fresnel_reflect_corr~mgn24~derived_fresnel_reflectivity be multiplied by (but only if
  derived_fresnel_reflect_corr~mgn24~the derived_fresnel_reflectivity is set in alt_flag_group),
  derived_fresnel_reflect_corr~mgn24~to allow for the effect of small-scale surface roughness.
  derived_fresnel_reflectivity~mgn25~ The derived_fresnel_reflectivity element provides the
  derived_fresnel_reflectivity~mgn25~value of the bulk reflectivity of the surface material,
  derived_fresnel_reflectivity~mgn25~averaged over the radar footprint, obtained by fitting the
  derived_fresnel_reflectivity~mgn25~altimeter echo to a suite of theoretical templates derived
  derived_fresnel_reflectivity~mgn25~from the Hagfors scattering model, but ignoring the effect
  derived_fresnel_reflectivity~mgn25~of small-scale surface roughness.
  derived_planetary_radius~mgn26~ The derived_planetary_radius element provides the value of
  derived_planetary_radius~mgn26~the mean Venus radius for this radar footprint, obtained by
  derived_planetary_radius~mgn26~subtracting (uncorrected_range_to_nadir -
  derived_planetary_radius~mgn26~atmospheric_correct_to_range) from the length of the
  derived_planetary_radius~mgn26~alt_spacecraft_position_vector element.
  derived_planetary_thresh_radi~mgn27~ The derived_planetary_thresh_radi element provides the
  derived_planetary_thresh_radi~mgn27~value of the threshold Venus radius for this radar
  derived_planetary_thresh_radi~mgn27~footprint, obtained from the value of the
  derived_planetary_thresh_radi~mgn27~derived_thresh_detector_index element, after correcting for
  derived_planetary_thresh_radi~mgn27~atmospheric delay.
  derived_rms_surface_slope~mgn28~ The derived_rms_surface_slope element provides the value
  derived_rms_surface_slope~mgn28~of the root mean square meter-scale surface slope, averaged
  derived_rms_surface_slope~mgn28~over the radar footprint, obtained by fitting the altimeter
  derived_rms_surface_slope~mgn28~echo to a suite of theoretical templates derived from the
  derived_rms_surface_slope~mgn28~Hagfors scattering model.
  derived_thresh_detector_index~mgn29~ The derived_thresh_detector_index element provides the
  derived_thresh_detector_index~mgn29~value of the element in range_sharp_echo_profile that
  derived_thresh_detector_index~mgn29~satisfies the altimeter threshold detection algorithm,
  derived_thresh_detector_index~mgn29~representing the distance to the nearest object in this
  derived_thresh_detector_index~mgn29~radar footprint in units of 33.2 meters, modulus a 10.02
  derived_thresh_detector_index~mgn29~kilometer altimeter range ambiguity.
  alt_cross_track_footprint_size~mgn3~ The alt_cross_track_footprint_size element provides the
  alt_cross_track_footprint_size~mgn3~value of the cross-track footprint dimension determined
  alt_cross_track_footprint_size~mgn3~solely by the radar baud length and the spacecraft altitude
  alt_cross_track_footprint_size~mgn3~at this point in the orbit.
  ephemeris_latitude_correction~mgn30~ The ephemeris_latitude_correction (VBF85) element provides
  ephemeris_latitude_correction~mgn30~the value of the correction applied to the footprint
  ephemeris_latitude_correction~mgn30~latitude value by the post-fitting MGMORB phase of the
  ephemeris_latitude_correction~mgn30~altimetry and radiometry reduction program.
  ephemeris_longitude_correction~mgn31~ The ephemeris_longitude_correction (VBF85) element
  ephemeris_longitude_correction~mgn31~provides the value of the correction applied to the
  ephemeris_longitude_correction~mgn31~footprint longitude value by the post-fitting MGMORB phase
  ephemeris_longitude_correction~mgn31~of the altimetry and radiometry reduction program.
  ephemeris_radius_correction~mgn32~ The ephemeris_radius_correction element provides the value
  ephemeris_radius_correction~mgn32~of the correction applied to the length of the
  ephemeris_radius_correction~mgn32~alt_spacecraft_position_vector element by the post-fitting
  ephemeris_radius_correction~mgn32~MGMORB phase of the altimetry and radiometry reduction
  ephemeris_radius_correction~mgn32~program.
  first_alt_footprint_tdb_time~mgn33~ The first_alt_footprint_tdb_time element provides the
  first_alt_footprint_tdb_time~mgn33~value of the spacecraft ephemeris time that represents the
  first_alt_footprint_tdb_time~mgn33~first altimeter footprint of this orbit. It is equal to the
  first_alt_footprint_tdb_time~mgn33~altimetry_footprint_tdb_time   value in the first record of
  first_alt_footprint_tdb_time~mgn33~this orbit's altimetry data file.
  first_rad_footprint_tdb_time~mgn34~ The first_rad_footprint_tdb_time element provides the
  first_rad_footprint_tdb_time~mgn34~value of the spacecraft ephemeris time of the first
  first_rad_footprint_tdb_time~mgn34~radiometer measurement of this orbit. It is equal to the
  first_rad_footprint_tdb_time~mgn34~rad_spacecraft_epoch_tdb_time   value in the first record
  first_rad_footprint_tdb_time~mgn34~of this orbit's radiometry data file.
  footprint_number~mgn35~ The footprint_number element provides a signed integer
  footprint_number~mgn35~value. The altimetry and radiometry processing program
  footprint_number~mgn35~assigns footprint 0 to that observed at nadir at periapsis.
  footprint_number~mgn35~The remaining footprints are located along the spacecraft
  footprint_number~mgn35~nadir track, with a separation that depends on the doppler
  footprint_number~mgn35~resolution of the altimeter at the epoch at which that
  footprint_number~mgn35~footprint is observed. Pre-periapsis footprints will be
  footprint_number~mgn35~assigned negative numbers, post-periapsis footprints will
  footprint_number~mgn35~be assigned positive ones. A loss of several consecutive
  footprint_number~mgn35~burst records from the ALT-EDR will result in missing
  footprint_number~mgn35~footprint numbers.
  formal_correlations_group~mgn36~ The formal_correlations_group provides the formal
  formal_correlations_group~mgn36~correlations between the derived_planetary_radius and the
  formal_correlations_group~mgn36~derived_rms_surface_fresnel_reflect elements, and between
  formal_correlations_group~mgn36~the derived_fresnel_reflectivity and the
  formal_correlations_group~mgn36~derived_planetary_radius elements, respectively. As the
  formal_correlations_group~mgn36~profile fitting algorithm is non-linear, the correlations
  formal_correlations_group~mgn36~may not be symmetric.
  formal_errors_group~mgn37~ The formal_errors_group element provides the value of the
  formal_errors_group~mgn37~1-sigma statistical errors expected in the determination of
  formal_errors_group~mgn37~the derived_planetary_radius, the
  formal_errors_group~mgn37~derived_rms_surface_slope, and the
  formal_errors_group~mgn37~derived_fresnel_reflectivity elements, respectively.
  last_alt_footprint_tdb_time~mgn38~ The last_alt_footprint_tdb_time element provides the value
  last_alt_footprint_tdb_time~mgn38~of the spacecraft ephemeris time that represents the last
  last_alt_footprint_tdb_time~mgn38~altimeter footprint of this orbit. It is equal to the
  last_alt_footprint_tdb_time~mgn38~altimetry_footprint_tdb_time   value in the last record of
  last_alt_footprint_tdb_time~mgn38~this orbit's altimetry data file.
  last_rad_footprint_tdb_time~mgn39~ The last_rad_footprint_tdb_time element provides the value
  last_rad_footprint_tdb_time~mgn39~of the spacecraft ephemeris time of the last radiometer
  last_rad_footprint_tdb_time~mgn39~measurement of this orbit. It is equal to the
  last_rad_footprint_tdb_time~mgn39~rad_spacecraft_epoch_tdb_time value in the last record of
  last_rad_footprint_tdb_time~mgn39~this orbit's radiometry data file.
  alt_flag2_group~mgn4~ Additional flag fields (unused).
  mult_peak_fresnel_reflect_corr~mgn40~ The mult_peak_fresnel_reflect_corr element provides the
  mult_peak_fresnel_reflect_corr~mgn40~correction factor that has been applied to
  mult_peak_fresnel_reflect_corr~mgn40~derived_fresnel_reflectivity to allow for radar echoes
  mult_peak_fresnel_reflect_corr~mgn40~possessing more than an single peak.
  non_range_prof_corrs_index~mgn41~ The non_range_prof_corrs_index element provides the value
  non_range_prof_corrs_index~mgn41~of the index of the element in non_range_sharp_echo_prof
  non_range_prof_corrs_index~mgn41~that corresponds to the first element in
  non_range_prof_corrs_index~mgn41~best_non_range_sharp_model_tpt[0]. The indices start at
  non_range_prof_corrs_index~mgn41~zero.
  non_range_sharp_echo_prof~mgn42~ The non_range_sharp_echo_prof element provides the value
  non_range_sharp_echo_prof~mgn42~of the power vs. time echo profile, at half-baud (0.21
  non_range_sharp_echo_prof~mgn42~microsecond) intervals, assembled from up to 16 frequency
  non_range_sharp_echo_prof~mgn42~components, without shifting their time origins (see
  non_range_sharp_echo_prof~mgn42~range_sharp_echo_profile element). This profile yields the
  non_range_sharp_echo_prof~mgn42~best estimate of the time dispersion of the echo, and hence
  non_range_sharp_echo_prof~mgn42~the value of the derived_rms_surface_slope and
  non_range_sharp_echo_prof~mgn42~derived_fresnel_reflectivity element.
  non_range_sharp_fit~mgn43~ The non_range_sharp_fit element provides the value of the
  non_range_sharp_fit~mgn43~'goodness of fit' measuring the correlation between the
  non_range_sharp_fit~mgn43~observed profile non_range_sharp_echo_prof and the
  non_range_sharp_fit~mgn43~theoretical template best_non_range_sharp_model_tpt
  non_range_sharp_fit~mgn43~elements. Scaling_factors for the
  non_range_sharp_fit~mgn43~best_non_range_sharp_model_tpt and the
  non_range_sharp_fit~mgn43~non_range_sharp_echo_prof elements provide the value of the
  non_range_sharp_fit~mgn43~conversion factor that multiplies the integer array
  non_range_sharp_fit~mgn43~elements of the best_non_range_sharp_model_tpt and
  non_range_sharp_fit~mgn43~non_range_sharp_echo_prof elements to yield their physical
  non_range_sharp_fit~mgn43~values, expressed as equivalent radar cross-sections in
  non_range_sharp_fit~mgn43~units of km**2.
  non_range_sharp_looks~mgn44~ The non_range_sharp_looks element provides the value of
  non_range_sharp_looks~mgn44~the number of statistically independent measurements of
  non_range_sharp_looks~mgn44~echo profile that were summed to produce the value for the
  non_range_sharp_looks~mgn44~profile non_range_sharp_echo_prof element.
  planet_reading_system_temp~mgn45~ The planet_reading_system_temp element provides the value
  planet_reading_system_temp~mgn45~of the raw radiometer reading, when switched into the SAR
  planet_reading_system_temp~mgn45~antenna, converted to equivalent noise temperature.
  rad_along_track_footprint_size~mgn46~ The rad_along_track_footprint_size provides the value of
  rad_along_track_footprint_size~mgn46~the along track dimension of the intersection of the SAR
  rad_along_track_footprint_size~mgn46~antenna (3dB one-way attenuation) cone with a sphere of
  rad_along_track_footprint_size~mgn46~radius average_planetary_radius.
  rad_cross_track_footprint_size~mgn47~ The rad_cross_track_footprint_size element provides the
  rad_cross_track_footprint_size~mgn47~value of the cross track dimension of the intersection of
  rad_cross_track_footprint_size~mgn47~the SAR antenna (3dB one-way attenuation) cone with a
  rad_cross_track_footprint_size~mgn47~sphere of radius average_planetary_radius.
  rad_emissivity_partial~mgn48~ The rad_emissivity_partial element provides the value of
  rad_emissivity_partial~mgn48~the partial derivative of surface_emissivity with respect
  rad_emissivity_partial~mgn48~to average_planetary_radius.
  rad_flag2_group~mgn49~ Additional flag fields (unused).
  alt_flag_group~mgn5~ The ALT_FLAG_GROUP element identifies the following flag
  alt_flag_group~mgn5~fields.
  alt_flag_group~mgn5~AR_FIT=0x0001
  alt_flag_group~mgn5~Record contains footprint values that have been
  alt_flag_group~mgn5~fitted in the altimetry and radiometry
  alt_flag_group~mgn5~mgmtac processing phase.
  alt_flag_group~mgn5~AR_EPHC=0x0002
  alt_flag_group~mgn5~Geometry values have been corrected
  alt_flag_group~mgn5~for ephemeris errors in the mgmorb phase.
  alt_flag_group~mgn5~AR_RHOC=0x0004
  alt_flag_group~mgn5~Reflectivity values have been corrected from C-BIDR
  alt_flag_group~mgn5~backscatter values in the mgmgen phase.
  alt_flag_group~mgn5~AR_RS2=0x0008
  alt_flag_group~mgn5~Range-sharpened values have passed the 2nd-order
  alt_flag_group~mgn5~template fitting criteria in the mgmtac phase.
  alt_flag_group~mgn5~AR_NRS2=0x0010
  alt_flag_group~mgn5~Non-range-sharpened values have passed the 2nd-order
  alt_flag_group~mgn5~template fitting criteria in the mgmtac phase.
  alt_flag_group~mgn5~AR_BAD=0x0020
  alt_flag_group~mgn5~Ignore this record entirely.
  alt_flag_group~mgn5~AR_RBAD=0x0040
  alt_flag_group~mgn5~Ignore the range-sharpened profile
  alt_flag_group~mgn5~range_sharp_echo_profile[] and the associated
  alt_flag_group~mgn5~derived_planetary_radius value.
  alt_flag_group~mgn5~AR_CBAD=0x0080
  alt_flag_group~mgn5~Ignore the non_range_sharp_echo_prof[]
  alt_flag_group~mgn5~and the associated derived_rms_surface_slope and
  alt_flag_group~mgn5~derived_fresnel_reflectivity values.
  alt_flag_group~mgn5~AR_TMARK=0x0100
  alt_flag_group~mgn5~Temporary derived_planetary_radius
  alt_flag_group~mgn5~marker flag, used in the mgmdqe phase.
  alt_flag_group~mgn5~AR_CMARK=0x0200
  alt_flag_group~mgn5~Temporary derived_rms_surface_slope marker flag, used
  alt_flag_group~mgn5~in the mgmdqe phase.
  alt_flag_group~mgn5~AR_FMARK=0x0400
  alt_flag_group~mgn5~Temporary derived_fresnel_reflect marker flag, used in
  alt_flag_group~mgn5~the mgmdqe phase.
  alt_flag_group~mgn5~AR_HAGFORS=0x0800
  alt_flag_group~mgn5~ar_slope and its errors and correlations are expressed
  alt_flag_group~mgn5~as Hagfors' C parameter instead of degrees of RMS
  alt_flag_group~mgn5~slope. This flag will not be set in any standard
  alt_flag_group~mgn5~ARCDR products. It is solely used during some
  alt_flag_group~mgn5~phases of internal MIT processing.
  alt_flag_group~mgn5~AR_BADALTA=0x1000
  alt_flag_group~mgn5~The altimetry antenna was pointed more than 5 degrees
  alt_flag_group~mgn5~from its expected location as given by the nominal
  alt_flag_group~mgn5~look-angle profile.
  alt_flag_group~mgn5~AR_SLOPEBAD=0x2000
  alt_flag_group~mgn5~The ar_slope parameter value
  alt_flag_group~mgn5~is suspect, and ar_prof should also be disregarded.
  alt_flag_group~mgn5~AR_RHOBAD=0x4000
  alt_flag_group~mgn5~The ar_rho value is suspect.
  alt_flag_group~mgn5~AR_RAD2=0x8000
  alt_flag_group~mgn5~This record was created under software
  alt_flag_group~mgn5~version 2 or higher, in which the data fields ar_rhofact,
  alt_flag_group~mgn5~ar_radius2, ar_sqi, and ar_thresh are significant.
  rad_flag_group~mgn50~ The RAD_FLAG_GROUP element identifies the following flag
  rad_flag_group~mgn50~fields.
  rad_flag_group~mgn50~RR_GEOC=0x0001
  rad_flag_group~mgn50~Geometry values have been corrected
  rad_flag_group~mgn50~for ephemeris errors in the phase.
  rad_flag_group~mgn50~RR_RADC=0x0002
  rad_flag_group~mgn50~The average_planetary_radius value has been
  rad_flag_group~mgn50~corrected by altimeter radius values.
  rad_flag_group~mgn50~RR_NOS1=0x0004
  rad_flag_group~mgn50~sar_average_backscatter[0] value missing.
  rad_flag_group~mgn50~RR_NOS2=0x0008
  rad_flag_group~mgn50~sar_average_backscatter[1] value missing.
  rad_flag_group~mgn50~RR_BAD=0x0010
  rad_flag_group~mgn50~The elements brightness_temperature,
  rad_flag_group~mgn50~average_planetary_radius, planet_reading_system_temp,
  rad_flag_group~mgn50~assumed_warm_sky_temperature, rad_receiver_system_temp,
  rad_flag_group~mgn50~surface_emission_temperature, and surface_emissivity, and
  rad_flag_group~mgn50~surface_temperature should be ignored.
  rad_flag_group~mgn50~RR_CAL=0x0020
  rad_flag_group~mgn50~The spacecraft is operating in its 'radiometric
  rad_flag_group~mgn50~calibration' mode, in which the SAR boresight is pointed
  rad_flag_group~mgn50~away from the planet. The rad_footprint_latitude and
  rad_flag_group~mgn50~rad_footprint_longitude fields contain the boresight
  rad_flag_group~mgn50~latitude and longitude in the inertial (J2000) coordinate
  rad_flag_group~mgn50~system, not in VBF85.
  rad_flag_group~mgn50~RR_NRAD=0x0040
  rad_flag_group~mgn50~The average_planetary_radius value could not be estimated
  rad_flag_group~mgn50~from the topography model.
  rad_flag_group~mgn50~RR_RAD2=0x0080
  rad_flag_group~mgn50~This record was created under software version 2 or
  rad_flag_group~mgn50~higher, in which elements rad_emissivity_partial,
  rad_flag_group~mgn50~surface_temperature, raw_rad_antenna_power,
  rad_flag_group~mgn50~raw_rad_load_power, alt_skip_factor, alt_gain_factor,
  rad_flag_group~mgn50~and alt_coarse_resolution are significant.
  rad_footprint_latitude~mgn51~ The rad_footprint_latitude (VBF85) element provides the
  rad_footprint_latitude~mgn51~value of the crust-fixed latitude, at
  rad_footprint_latitude~mgn51~rad_spacecraft_epoch_tdb_time, of the intersection of the
  rad_footprint_latitude~mgn51~antenna boresight and the planetary surface (a sphere of
  rad_footprint_latitude~mgn51~radius average_planetary_radius element).
  rad_footprint_longitude~mgn52~ The rad_footprint_longitude (VBF85) element provides the
  rad_footprint_longitude~mgn52~crust-fixed longitude, at rad_spacecraft_epoch_tdb_time, of
  rad_footprint_longitude~mgn52~the intersection of the antenna boresight and the planetary
  rad_footprint_longitude~mgn52~surface (a sphere of radius average_planetary_radius).
  rad_footprints~mgn53~ The footprints element provides the value of the number of
  rad_footprints~mgn53~Standard Format Data Units  in a specific orbit's
  rad_footprints~mgn53~radiometry data file.
  rad_number~mgn54~ The rad_number element provides the value of the number
  rad_number~mgn54~assigned by the MSPF (Multimission SAR Processing Facility)
  rad_number~mgn54~SAR processor (from C-BIDR) to the burst header that
  rad_number~mgn54~contains the radiometer measurement referenced by this
  rad_number~mgn54~element. This is performed on every other burst, so
  rad_number~mgn54~rad_number will usually increase by 2 between records.
  rad_partials_group~mgn55~ The rad_partials_group element provides the value of the
  rad_partials_group~mgn55~partials of the rad_footprint_latitude, the
  rad_partials_group~mgn55~rad_footprint_longitude, and the average_planetary_radius
  rad_partials_group~mgn55~elements with respect to the rad_spacecraft_position_vector
  rad_partials_group~mgn55~and rad_spacecraft_velocity_vector elements.
  rad_receiver_system_temp~mgn56~ The rad_receiver_system_temp element provides the value of
  rad_receiver_system_temp~mgn56~the receiver input radiometer reading, converted to
  rad_receiver_system_temp~mgn56~equivalent noise temperature.  This is the difference
  rad_receiver_system_temp~mgn56~between raw_rad_antenna_power and raw_rad_load_power,
  rad_receiver_system_temp~mgn56~converted to equivalent noise temperature and compensated
  rad_receiver_system_temp~mgn56~for changes in receiver gain and temperature.
  rad_spacecraft_epoch_tdb_time~mgn57~ The rad_spacecraft_epoch_tdb_time element provides the
  rad_spacecraft_epoch_tdb_time~mgn57~value of the ephemeris time at which the radiometry
  rad_spacecraft_epoch_tdb_time~mgn57~measurement was made.
  rad_spacecraft_position_vector~mgn58~ The rad_spacecraft_position_vector element provides the
  rad_spacecraft_position_vector~mgn58~value of the spacecraft position at
  rad_spacecraft_position_vector~mgn58~rad_spacecraft_epoch_tdb_time, relative to the Venus center
  rad_spacecraft_position_vector~mgn58~of mass, expressed in inertial coordinates in the J2000
  rad_spacecraft_position_vector~mgn58~coordinate system.
  rad_spacecraft_velocity_vector~mgn59~ The rad_spacecraft_velocity_vector element provides the
  rad_spacecraft_velocity_vector~mgn59~value of the spacecraft velocity at
  rad_spacecraft_velocity_vector~mgn59~rad_spacecraft_epoch_tdb_time, relative to the Venus center
  rad_spacecraft_velocity_vector~mgn59~of mass, expressed in inertial coordinates in the J2000
  rad_spacecraft_velocity_vector~mgn59~coordinate system.
  alt_footprint_latitude~mgn6~ The alt_footprint_latitude (VBF85) element provides the
  alt_footprint_latitude~mgn6~value of the crust-fixed latitude of the center of the
  alt_footprint_latitude~mgn6~altimeter footprint, in the range of -90 (South Pole) to 90
  alt_footprint_latitude~mgn6~(North Pole).
  range_sharp_echo_profile~mgn60~ The range_sharp_echo_profile element provides the value of
  range_sharp_echo_profile~mgn60~the power vs. time echo profile, at half-baud (0.21
  range_sharp_echo_profile~mgn60~microsecond) intervals, assembled from up to 16 frequency
  range_sharp_echo_profile~mgn60~components, each shifted in time so as to align their
  range_sharp_echo_profile~mgn60~rising edges. This profile yields the best estimate of the
  range_sharp_echo_profile~mgn60~two-way echo time, and hence the value of the
  range_sharp_echo_profile~mgn60~derived_planetary_radius element.
  range_sharp_fit~mgn61~ The range_sharp_fit element provides the value of the
  range_sharp_fit~mgn61~parameter which measures the correlation between the
  range_sharp_fit~mgn61~observed range_sharp_echo_profile and the theoretical
  range_sharp_fit~mgn61~template best_range_sharp_model_tmplt elements.
  range_sharp_looks~mgn62~ The range_sharp_looks element provides the value of the
  range_sharp_looks~mgn62~number of equivalent looks of statistically independent
  range_sharp_looks~mgn62~measurements of echo profile that were summed to produce
  range_sharp_looks~mgn62~the values for the range_sharp_echo_profile element.
  range_sharp_prof_corrs_index~mgn63~ The range_sharp_prof_corrs_index element provides the
  range_sharp_prof_corrs_index~mgn63~value of the index of the element in
  range_sharp_prof_corrs_index~mgn63~range_sharp_echo_profile that corresponds to the first
  range_sharp_prof_corrs_index~mgn63~element in best_range_sharp_model_tmplt[0]. The indices
  range_sharp_prof_corrs_index~mgn63~start at zero.
  range_sharp_scaling_factor~mgn64~ The range_sharp_scaling_factor element provides the value
  range_sharp_scaling_factor~mgn64~of the conversion factor for the best_range_model_tmplt and
  range_sharp_scaling_factor~mgn64~the range_sharp_echo_profile element that multiplies the
  range_sharp_scaling_factor~mgn64~integer array of the best_range_model_tmplt and
  range_sharp_scaling_factor~mgn64~range_sharp_echo_profile elements to yield their physical
  range_sharp_scaling_factor~mgn64~values, expressed as specific radar cross-sections in units
  range_sharp_scaling_factor~mgn64~of km**2.
  raw_rad_antenna_power~mgn65~ The raw_rad_antenna_power element provides the value of
  raw_rad_antenna_power~mgn65~the radiometer noise power when the receiver is connected
  raw_rad_antenna_power~mgn65~to the SAR antenna. It is corrected for systematic errors
  raw_rad_antenna_power~mgn65~resulting from leakage of the altimeter signal.
  raw_rad_load_power~mgn66~ The raw_rad_load_power element provides the value of the
  raw_rad_load_power~mgn66~radiometer noise power when the receiver is connected to a
  raw_rad_load_power~mgn66~load at a known temperature. It is averaged over as many as
  raw_rad_load_power~mgn66~10 successive measurements and corrected for systematic
  raw_rad_load_power~mgn66~errors resulting from leakage of the altimeter signal.
  receiver_noise_calibration~mgn67~ The receiver_noise_calibration element provides the value
  receiver_noise_calibration~mgn67~of a measure of the altimeter noise background, obtained
  receiver_noise_calibration~mgn67~from the pulse- compressed altimeter signals by the mgmtac
  receiver_noise_calibration~mgn67~phase of the altimetry and radiometry data reduction
  receiver_noise_calibration~mgn67~program.
  sar_average_backscatter~mgn68~ The sar_average_backscatter element provides the values of
  sar_average_backscatter~mgn68~a pair of running averages of SAR image pixel values,
  sar_average_backscatter~mgn68~sar_average_backscatter[0] taken from pixels lying westward
  sar_average_backscatter~mgn68~of the antenna boresight, and sar_average_backscatter[1]
  sar_average_backscatter~mgn68~taken from pixels lying to the east of it.
  sar_footprint_size~mgn69~ The sar_footprint_size element provides the value of the
  sar_footprint_size~mgn69~approximate diameter of the surface footprint represented
  sar_footprint_size~mgn69~by the SAR backscatter values which are provided by the
  sar_footprint_size~mgn69~sar_average_backscatter element.
  alt_footprint_longitude~mgn7~ The alt_footprint_longitude (VBF85) element provides the
  alt_footprint_longitude~mgn7~value of the crust-fixed longitude of the center of the
  alt_footprint_longitude~mgn7~altimeter footprint, in the range of 0 - 360 easterly
  alt_footprint_longitude~mgn7~longitude. Periapsis nadir increases in longitude by about
  alt_footprint_longitude~mgn7~1.48 deg per day (about 0.2 deg per orbit).
  sfdu_label_and_length~mgn70~ The SFDU_label_and_length element identifies the label and
  sfdu_label_and_length~mgn70~length of the Standard Format Data Unit (SFDU).
  signal_quality_indicator~mgn71~ The signal_quality_indicator element provides a measure of
  signal_quality_indicator~mgn71~the signal-to- noise-ratio of the measurement of the
  signal_quality_indicator~mgn71~derived_thresh_detector_index value. It is the ratio
  signal_quality_indicator~mgn71~between the sum of the 10 successive values of
  signal_quality_indicator~mgn71~range_sharp_echo_profile, starting 10 values after the
  signal_quality_indicator~mgn71~element numbered by the derived_thresh_detector_index
  signal_quality_indicator~mgn71~element value, to the 10 successive values of
  signal_quality_indicator~mgn71~range_sharp_echo_profile, starting 20 values before the
  signal_quality_indicator~mgn71~element numbered by the derived_thresh_detector_index
  signal_quality_indicator~mgn71~element value. This ratio is expressed in decibels.
  surface_emission_temperature~mgn72~ The surface_emission_temperature element provides the
  surface_emission_temperature~mgn72~value of the temperature assumed for the planetary surface
  surface_emission_temperature~mgn72~covered by the radiometer footprint, derived by correcting
  surface_emission_temperature~mgn72~brightness_temperature for atmospheric emission and
  surface_emission_temperature~mgn72~absorption.
  time_range_number~mgn73~The time_range number is unique to AMMOS-MGN ephemeris files
  time_range_number~mgn73~and identifies groups of time ranges in the catalog object.
  uncorrected_distance_to_nadir~mgn74~ The uncorrected_distance_to_nadir element provides the
  uncorrected_distance_to_nadir~mgn74~`raw' measurement of range-to-surface, obtained from the
  uncorrected_distance_to_nadir~mgn74~pulse-compressed altimeter signals by the MGMTAC phase of
  uncorrected_distance_to_nadir~mgn74~the altimetry and radiometry data reduction program.
  alt_footprints~mgn8~ The footprints element provides the value of the number of
  alt_footprints~mgn8~Standard Format Data Units  in a specific orbit's altimetry
  alt_footprints~mgn8~data file.
  alt_gain_factor~mgn9~ The alt_gain_factor elements provide the values of the
  alt_gain_factor~mgn9~altimeter gain factor taken from the radar burst header.
  alt_gain_factor~mgn9~alt_gain_factor[0] pertains to the measurement of
  alt_gain_factor~mgn9~raw_rad_antenna_power and alt_gain_factor[1] to
  alt_gain_factor~mgn9~raw_rad_load_power.
  node_manager_pds_user_id~mgrpdsuserid~The node_manager_pds_user_id element provides the
  node_manager_pds_user_id~mgrpdsuserid~pds_user_id of the node manager.
  midnight_longitude~midnightlon~The midnight_longitude element identifies the longitude on
  midnight_longitude~midnightlon~the target body at which midnight was occurring at the time
  midnight_longitude~midnightlon~of the start of an observation sequence.
  midnight_longitude~midnightlon~Midnight_longitude is used to assist in geometry
  midnight_longitude~midnightlon~calculations.
  midnight_longitude~midnightlon~ 
  midnight_longitude~midnightlon~Note:  The coordinate_system_type data element should be used in con-
  midnight_longitude~midnightlon~junction with this data element.
  minimum_available_sampling_int~minavlsampiv~The minimum_available_sampling_interval element identifies
  minimum_available_sampling_int~minavlsampiv~the finest sampling at which a particular set of data is
  minimum_available_sampling_int~minavlsampiv~available.
  minimum_available_sampling_int~minavlsampiv~For example, magnetometer data are available in various
  minimum_available_sampling_int~minavlsampiv~sampling intervals ranging from 1.92 seconds to 96 seconds.
  minimum_available_sampling_int~minavlsampiv~ Thus, for magnetometer data the value of the
  minimum_available_sampling_int~minavlsampiv~minimum_available_sampling_interval would be 1.92.
  minimum_available_sampling_int~minavlsampiv~Note that the unit of measure for the sampling interval is
  minimum_available_sampling_int~minavlsampiv~provided by the unit element.
  minimum_b1950_ring_longitude~minbringlong~ The minimum_B1950_ring_longitude element specifies the
  minimum_b1950_ring_longitude~minbringlong~minimum inertial longitude within a ring area relative to
  minimum_b1950_ring_longitude~minbringlong~the B1950 prime meridian, rather than to the J2000 prime
  minimum_b1950_ring_longitude~minbringlong~meridian.  The prime meridian is the ascending node of the
  minimum_b1950_ring_longitude~minbringlong~planet's invariable plane on the Earth's mean equator of
  minimum_b1950_ring_longitude~minbringlong~B1950.  Longitudes are measured in the direction of orbital
  minimum_b1950_ring_longitude~minbringlong~motion along the planet's invariable plane to the ring's
  minimum_b1950_ring_longitude~minbringlong~ascending node, and thence along the ring plane.
  minimum_b1950_ring_longitude~minbringlong~ 
  minimum_b1950_ring_longitude~minbringlong~Note:  For areas that cross the prime meridian, the minimum
  minimum_b1950_ring_longitude~minbringlong~ring longitude will have a value greater than the maximum ring
  minimum_b1950_ring_longitude~minbringlong~longitude.
  minimum_brightness_temperature~minbritetemp~The minimum_brightness_temperature element provides the
  minimum_brightness_temperature~minbritetemp~minimum brightness temperature value measured within a
  minimum_brightness_temperature~minbritetemp~given set of data or a given sequence.
  minimum_brightness_temperature~minbritetemp~Brightness temperature is the temperature of an ideal
  minimum_brightness_temperature~minbritetemp~blackbody whose radiant energy in a particular wavelength
  minimum_brightness_temperature~minbritetemp~range is the same as that of an observed object or feature.
  minimum_channel_id~minchnlid~The minimum_channel_id element provides an identification of
  minimum_channel_id~minchnlid~the lowest energy channel from which PLS instrument data is
  minimum_channel_id~minchnlid~telemetered to Earth while the instrument is operating in a
  minimum_channel_id~minchnlid~particular mode in a given frame.  Each mode consists of a
  minimum_channel_id~minchnlid~specific number of energy/charge channels which sequentially
  minimum_channel_id~minchnlid~measure current, but information from all measured channels
  minimum_channel_id~minchnlid~may not be telemetered to Earth.
  minimum_column_value~mincolval~The minimum_column_value provides the minimum real value
  minimum_column_value~mincolval~currently allowed by the PDS catalog for a given table
  minimum_column_value~mincolval~element.  This value is updated when new limits are
  minimum_column_value~mincolval~discovered.  Note that these elements are unique to a table
  minimum_column_value~mincolval~and may have different values depending on which table the
  minimum_column_value~mincolval~ element is associated with.
  minimum_emission_angle~minemissang~The minimum_emission_angle element provides the minimum
  minimum_emission_angle~minemissang~emission angle value.  See emission_angle.
  mineral_name~mineralname~The mineral_name element provides the name assigned to a
  mineral_name~mineralname~mineral.  The name is usually chosen by the person who
  mineral_name~mineralname~first identified and described the mineral.
  minimum_instrument_exposr_dur~minexposdur~The minimum_instrument_exposure_duration element provides
  minimum_instrument_exposr_dur~minexposdur~the minimum possible exposure time for the instrument mode
  minimum_instrument_exposr_dur~minexposdur~identified by the instrument_mode_id element.
  minimum_instrument_exposr_dur~minexposdur~See instrument_exposure_duration.
  minimum~minimum~The minimum element indicates the smallest value occurring
  minimum~minimum~in a given instance of the data object.
  minimum~minimum~Note:  For PDS and Mars Observer applications -- because of
  minimum~minimum~the unconventional data type of this data element, the
  minimum~minimum~element should appear in labels only within an explicit
  minimum~minimum~object, i.e. anywhere between an 'OBJECT =' and an
  minimum~minimum~'END_OBJECT'.
  minimum_incidence_angle~minincidang~The minimum_incidence_angle element provides the minimum
  minimum_incidence_angle~minincidang~incidence angle value.  See incidence_angle.
  minimum_instrument_parameter~mininstparm~The minimum_instrument_parameter element provides an
  minimum_instrument_parameter~mininstparm~instrument's minimum usefully detectable signal level for a
  minimum_instrument_parameter~mininstparm~given instrument parameter.  This value indicates the
  minimum_instrument_parameter~mininstparm~physical value corresponding to the minimum output
  minimum_instrument_parameter~mininstparm~of an instrument.
  minimum_instrument_parameter~mininstparm~The instrument parameter to which this relates is identified
  minimum_instrument_parameter~mininstparm~by the instrument_parameter_name element.
  minimum_latitude~minlat~The minimum_latitude element specifies the southernmost
  minimum_latitude~minlat~latitude of a spatial area, such as a map, mosaic, bin,
  minimum_latitude~minlat~feature, or region.  See latitude.
  minimum_length~minlength~The minmum_length element supplies the minimum number of
  minimum_length~minlength~units that are required for the representation of a data
  minimum_length~minlength~element. This element is generally assigned a value of N/A
  minimum_length~minlength~except in the case where a minimum number of units are
  minimum_length~minlength~required for the value. For example a password may require
  minimum_length~minlength~a minimum number of characters to be valid.
  minimum_limb_angle~minlimbang~The minimum_limb_angle element provides the minimum value
  minimum_limb_angle~minlimbang~of the limb angle within a given set of data.  See
  minimum_limb_angle~minlimbang~limb_angle.
  minimum_local_time~minlocaltime~The minimum_local_time element provides the minimum
  minimum_local_time~minlocaltime~local time of day on the target body, measured in hours
  minimum_local_time~minlocaltime~from local midnight.
  minimum_longitude~minlon~The minimum_longitude element specifies the easternmost
  minimum_longitude~minlon~(right_most) longitude of a spatial area, such as a map,
  minimum_longitude~minlon~mosaic, bin, feature, or region.  See longitude.
  minimum_longitude~minlon~ 
  minimum_longitude~minlon~Note:  The minimum longitude data element is obsolete and should no
  minimum_longitude~minlon~longer be used.  The assumed coordinate system was planetographic for
  minimum_longitude~minlon~prograde rotators (PDS Cartographic Standards V3.0).  See coordinate_
  minimum_longitude~minlon~system_type, easternmost_longitude and westernmost_longitude.
  minimum_parameter~minparm~The minimum_parameter element specifies the minimum
  minimum_parameter~minparm~allowable value for a parameter input to a given data
  minimum_parameter~minparm~processing program.
  minimum_parameter~minparm~The parameter constrained by this value is identified by
  minimum_parameter~minparm~the parameter_name element.
  minimum_phase_angle~minphsang~The minimum_phase_angle element provides the minimum phase
  minimum_phase_angle~minphsang~angle value.  See phase_angle.
  minimum_radial_resolution~minradres~ The minimum_radial_resolution element indicates the
  minimum_radial_resolution~minradres~minimum (finest) radial distance over which changes in ring
  minimum_radial_resolution~minradres~properties can be detected within a data product.
  minimum_radial_sampling_interv~minradsamint~ The minimum_radial_sampling_interval element indicates the
  minimum_radial_sampling_interv~minradsamint~minimum radial spacing between consecutive points in a ring
  minimum_radial_sampling_interv~minradsamint~profile.  In practice, this may be somewhat smaller than
  minimum_radial_sampling_interv~minradsamint~the minimum_radres element because the profile
  minimum_radial_sampling_interv~minradsamint~may be over-sampled.
  minimum_ring_longitude~minringlong~ The minimum_ring_longitude element specifies the minimum
  minimum_ring_longitude~minringlong~inertial longitude of a ring area relative to the prime
  minimum_ring_longitude~minringlong~meridian.  In planetary ring systems, the prime meridian is
  minimum_ring_longitude~minringlong~the ascending node of the planet's invariable plane on the
  minimum_ring_longitude~minringlong~Earth's mean equator of J2000.  Longitudes are measured in
  minimum_ring_longitude~minringlong~the direction of orbital motion along the planet's
  minimum_ring_longitude~minringlong~invariable plane to the ring's ascending node, and thence
  minimum_ring_longitude~minringlong~along the ring plane.
  minimum_ring_longitude~minringlong~ 
  minimum_ring_longitude~minringlong~Note:  For areas that cross the prime meridian, the minimum ring longi-
  minimum_ring_longitude~minringlong~tude will have a value greater than the maximum ring longitude.
  minimum_ring_longitude~minringlong~Note:  The invariable plane of a planet is equivalent to its equatorial
  minimum_ring_longitude~minringlong~plane for every ringed planet except Neptune.
  minimum_ring_radius~minringrad~ The minimum_ring_radius element indicates the minimum
  minimum_ring_radius~minringrad~(innermost) radial location of an area within a planetary
  minimum_ring_radius~minringrad~ring system.  Radii are measured from the center of the
  minimum_ring_radius~minringrad~planet along the nominal ring plane.
  minimum_sampling_parameter~minsampparm~The minimum_sampling_parameter element identifies the
  minimum_sampling_parameter~minsampparm~minimum value at which a given data item was sampled.
  minimum_sampling_parameter~minsampparm~For example, a spectrum that was measured in the 0.4 to 3.5
  minimum_sampling_parameter~minsampparm~micrometer spectral region would have a
  minimum_sampling_parameter~minsampparm~minimum_sampling_parameter value of 0.4.
  minimum_sampling_parameter~minsampparm~The sampling parameter constrained by this value is
  minimum_sampling_parameter~minsampparm~identified by the sampling_parameter_name element.  Note
  minimum_sampling_parameter~minsampparm~that the unit of measure for the sampling parameter is
  minimum_sampling_parameter~minsampparm~provided by the unit element.
  minimum_slant_distance~minslantdist~The minimum_slant_distance element provides the minimum
  minimum_slant_distance~minslantdist~slant distance value.  See slant_distance.
  minimum_solar_band_albedo~minsolbndalb~The minimum_solar_band_albedo element provides the minimum
  minimum_solar_band_albedo~minsolbndalb~solar band albedo value measured within a given set of data
  minimum_solar_band_albedo~minsolbndalb~or a given sequence.
  minimum_spectral_contrast~minspeccontr~The minimum_spectral_contrast element provides the minimum
  minimum_spectral_contrast~minspeccontr~value of spectral contrast within a given set of data.  See
  minimum_spectral_contrast~minspeccontr~spectral_contrast_ range.
  minimum_surface_pressure~minsurfpres~The minimum_surface_pressure element provides the minimum
  minimum_surface_pressure~minsurfpres~surface pressure value for the atmosphere of a given body.
  minimum_surface_temperature~minsurftemp~The minimum_surface_temperature element provides the minimum
  minimum_surface_temperature~minsurftemp~equatorial surface temperature value for a given body during
  minimum_surface_temperature~minsurftemp~its year.
  minimum_wavelength~minwave~The minimum_wavelength element identifies the minimum wavelength at which
  minimum_wavelength~minwave~an observation can be made or was made.  For instruments, this may depend
  minimum_wavelength~minwave~on the instrument detector or filter characteristics.  For data products,
  minimum_wavelength~minwave~this is the effective lower limit on the wavelength detected.
  missing_scan_lines~misscanlines~The MISSING_SCAN_LINES element is the total number of scan lines
  missing_scan_lines~misscanlines~missing from an image or observation when it was received on Earth.
  missing_constant~missingconst~The missing_constant element supplies the value used when no science
  missing_constant~missingconst~data were available.
  missing_constant~missingconst~Note:  For PDS and Mars Observer applications -- because of
  missing_constant~missingconst~the unconventional data type of this data element, the
  missing_constant~missingconst~element should appear in labels only within an explicit
  missing_constant~missingconst~object, i.e. anywhere between an 'OBJECT =' and an
  missing_constant~missingconst~'END_OBJECT'.
  mission_id~missionid~The mission_id element provides a synonym or mnemonic for
  mission_id~missionid~the mission_name element.
  mission_id~missionid~Note:  Within AMMOS this may also be a numeric value which is
  mission_id~missionid~the DSN mission number.
  mode_continuation_flag~modecontflag~The mode_continuation_flag element is a yes-or-no flag which
  mode_continuation_flag~modecontflag~indicates if the first mode in a frame is a continuation of
  mode_continuation_flag~modecontflag~a measurement from the previous frame.  Some modes require
  mode_continuation_flag~modecontflag~longer than one frame to make a measurement, resulting in
  mode_continuation_flag~modecontflag~their continuation to a subsequent frame.  In that case, the
  mode_continuation_flag~modecontflag~mode_ continuation_flag element would have the value YES.
  mode_integration_duration~modeintgdur~The mode_integration_duration element provides the length of
  mode_integration_duration~modeintgdur~time required to measure all the channels which are sampled
  mode_integration_duration~modeintgdur~when the instrument is operating in a given mode.
  mosaic_desc~mosaicd~The mosaic_desc element provides a brief textual
  mosaic_desc~mosaicd~description of a mosaic.
  mosaic_images~mosaicimages~The mosaic_images element identifies the number of images
  mosaic_images~mosaicimages~which are contained in a given mosaic.
  mosaic_production_parameter~mosaicprdprm~The mosaic_production_parameter element identifies the
  mosaic_production_parameter~mosaicprdprm~method of production of a mosaic product (e.g., manual vs.
  mosaic_production_parameter~mosaicprdprm~digital).
  mosaic_sequence_number~mosaicseqnum~The mosaic_sequence_number element is a numeric identifier
  mosaic_sequence_number~mosaicseqnum~which defines a group of related images on a single mosaic.
  mosaic_sequence_number~mosaicseqnum~The mosaic_sequence_number is necessary when several groups
  mosaic_sequence_number~mosaicseqnum~of images covering different regions are printed on one
  mosaic_sequence_number~mosaicseqnum~photo_product.
  mosaic_series_id~mosaicserid~The mosaic_series_id element is an alphanumeric
  mosaic_series_id~mosaicserid~identifier for mosaics from a given mission.
  mosaic_sheet_number~mosaicshtnum~The mosaic_sheet_number element is a numeric identifier for
  mosaic_sheet_number~mosaicshtnum~a mosaic series or for a mosaic within a mosaic series.
  mission_alias_name~msnaliasname~The mission_alias_name element provides an official name of
  mission_alias_name~msnaliasname~a mission  used during the initial design, implementation,
  mission_alias_name~msnaliasname~or prelaunch phases. Example values: mission_name:MAGELLAN,
  mission_alias_name~msnaliasname~mission_alias_name:VENUS RADAR MAPPER.
  mission_desc~msnd~The mission_desc element summarizes major aspects of
  mission_desc~msnd~a planetary mission or project, including the number and
  mission_desc~msnd~type of spacecraft, the target body or bodies and major
  mission_desc~msnd~accomplishments.
  mission_name~msnname~The mission_name element identifies a major planetary
  mission_name~msnname~mission or project.
  mission_name~msnname~A given planetary mission may be associated with one or
  mission_name~msnname~more spacecraft.
  mission_name_or_alias~msnnamealias~The mission_name_or_alias element provides the capability to
  mission_name_or_alias~msnnamealias~enter either a mission name or a mission alias name in a
  mission_name_or_alias~msnnamealias~single input parameter field of a user view.
  mission_objectives_summary~msnobjsmy~The mission_objectives_summary element describes the major
  mission_objectives_summary~msnobjsmy~scientific objectives of a planetary mission or project.
  mission_phase_name~msnphasname~The mission_phase_name element provides the commonly-used
  mission_phase_name~msnphasname~identifier of a mission phase.
  mission_phase_desc~msnphsd~The mission_phase_desc element summarizes key
  mission_phase_desc~msnphsd~aspects of a mission phase.
  mission_phase_stop_time~msnphsstoptm~The mission_phase_stop_time element provides the date and
  mission_phase_stop_time~msnphsstoptm~time of the end of a mission phase in UTC system format.
  mission_phase_stop_time~msnphsstoptm~Formation rule: YYYY-MM-DDThh:mm:ss[.fff]
  mission_phase_start_time~msnphsstrttm~The mission_phase_start_time element provides the date and
  mission_phase_start_time~msnphsstrttm~time of the beginning of a mission phase in UTC system format.
  mission_phase_start_time~msnphsstrttm~Formation rule: YYYY-MM-DDThh:mm:ss[.fff]
  mission_phase_type~msnphstype~The mission_phase_type element identifies the type of a
  mission_phase_type~msnphstype~major segment or 'phase' of a spacecraft mission.  Example
  mission_phase_type~msnphstype~values: LAUNCH, CRUISE, ENCOUNTER.
  mission_stop_date~msnstopdate~The mission_stop_date element provides the date of the end
  mission_stop_date~msnstopdate~of a mission in UTC system format.
  mission_stop_date~msnstopdate~Formation rule:  YYYY-MM-DDThh:mm:ss[.fff]
  mission_start_date~msnstrtdate~The mission_start_date element provides the date of the
  mission_start_date~msnstrtdate~beginning of a mission in UTC system format.
  mission_start_date~msnstrtdate~Formation rule:  YYYY-MM-DDThh:mm:ss[.fff]
  naif_data_set_id~naifdsid~The naif_data_set_id element provides the data_set_id which
  naif_data_set_id~naifdsid~contains the position information for the instrument.
  naif_data_set_id~naifdsid~Note:  This data element is obsolete.  The product_id data element
  naif_data_set_id~naifdsid~should be used instead.
  name~name~The name data element indicates a literal value
  name~name~representing the common term used to identify an element or
  name~name~object.  See also: 'id'.
  name~name~Note:  In the PDS data dictionary, name is restricted to 30
  name~name~characters, and must conform to PDS nomenclature standards.
  native_stop_time~nativestoptm~The native_stop_time element provides a time value at the
  native_stop_time~nativestoptm~end of a time period of interest. Native time is 'native to'
  native_stop_time~nativestoptm~(that is, resident within) a given set of data, in those
  native_stop_time~nativestoptm~cases in which the native time field is in a format other
  native_stop_time~nativestoptm~than the standard UTC system format.  For example, the
  native_stop_time~nativestoptm~spacecraft clock count could be a native time value.
  native_start_time~nativestrttm~The native_start_time element provides a time value at the
  native_start_time~nativestrttm~beginning of a time period of interest. Native time is
  native_start_time~nativestrttm~'native to' (that is, resident within) a given set of data,
  native_start_time~nativestrttm~in those cases in which the native time field is in a format
  native_start_time~nativestrttm~other than the standard UTC system format.  For example, the
  native_start_time~nativestrttm~spacecraft clock count could be a native time value.
  nav_unique_id~navuniqueid~The nav_unique_id element is an AMMOS-MGN unique element used to express a
  nav_unique_id~navuniqueid~NAV-unique identifier for the file.
  nav_unique_id~navuniqueid~Note:  This data element is obsolete.  The source_product_id element
  nav_unique_id~navuniqueid~should be used instead.
  north_azimuth_clock_angle~nazclkang~The north_azimuth_clock_angle element specifies the direction of the
  north_azimuth_clock_angle~nazclkang~northward pointing azimuth on the surface of the target body as it
  north_azimuth_clock_angle~nazclkang~appears at the center of an image. It is measured from the 'upward'
  north_azimuth_clock_angle~nazclkang~direction, clockwise to the northward azimuth as projected into the
  north_azimuth_clock_angle~nazclkang~image plane, assuming the image is displayed as defined by the
  north_azimuth_clock_angle~nazclkang~SAMPLE_DISPLAY_DIRECTION and LINE_DISPLAY_DIRECTION elements. This
  north_azimuth_clock_angle~nazclkang~keyword is intended to be a replacement for the NORTH_AZIMUTH keyword
  north_azimuth_clock_angle~nazclkang~which has not been used in a consistent way in the past.
  north_azimuth_clock_angle~nazclkang~NULL
  north_azimuth_clock_angle~nazclkang~Note: In some cases, knowledge of the inertial orientation of the
  north_azimuth_clock_angle~nazclkang~ratational axis improves with time. This keyword necessarily reflects
  north_azimuth_clock_angle~nazclkang~the state of knowledge of the rotational axis at the time of preparing
  north_azimuth_clock_angle~nazclkang~the data product as given by the POLE_DECLINATION and POLE_RIGHT_ASCENSION
  north_azimuth_clock_angle~nazclkang~elements. Note also that this quantity can vary significantly within a
  north_azimuth_clock_angle~nazclkang~single image, particularly when a large fraction of the body is
  north_azimuth_clock_angle~nazclkang~included in the image, so it is sensitive to the accuracy of an image's
  north_azimuth_clock_angle~nazclkang~pointing information. This keyword is undefined if the central pixel of
  north_azimuth_clock_angle~nazclkang~an image does not intersect the target body.
  node_institution_name~ndinstnname~The node_institution_name element identifies a university,
  node_institution_name~ndinstnname~research center, NASA center or other institution associated
  node_institution_name~ndinstnname~with a PDS node.
  node_desc~noded~The node_desc element describes a PDS Node.
  node_id~nodeid~The node_id element provides the node id assigned to a
  node_id~nodeid~ science community node.
  node_name~nodename~The node_name element provides the officially recognized
  node_name~nodename~name of a PDS Node.
  noise_level~noiselevel~The noise_level element identifies the threshold at which
  noise_level~noiselevel~signal is separable from noise in a given data set or for
  noise_level~noiselevel~measurements performed by a particular instrument.
  noise_level~noiselevel~For instruments the noise level is a function primarily of
  noise_level~noiselevel~the instrument characteristics, while for data sets or data
  noise_level~noiselevel~products the noise level can also be a function of the data
  noise_level~noiselevel~processing history.
  noise_type~noisetype~ The noise_type element indicates the type of the noise
  noise_type~noisetype~statistics in a data product.
  nominal_energy_resolution~nomenergyres~The nominal_energy_resolution element provides an
  nominal_energy_resolution~nomenergyres~approximation of the energy resolution obtained during a
  nominal_energy_resolution~nomenergyres~particular instrument mode.  Energy resolution is defined as
  nominal_energy_resolution~nomenergyres~the width of an energy channel divided by the average energy
  nominal_energy_resolution~nomenergyres~of that channel.  A nominal value is given as this quantity
  nominal_energy_resolution~nomenergyres~varies between channels.
  nominal_operating_temperature~nomopertemp~The nominal_operating_temperature element identifies the
  nominal_operating_temperature~nomopertemp~operating temperature as given in the specifications for an
  nominal_operating_temperature~nomopertemp~instrument detector.
  non_clustered_key~nonclustkey~The non_clustered_key element indicates whether a column in
  non_clustered_key~nonclustkey~a table has a nonclustered index.  This index is not unique
  non_clustered_key~nonclustkey~does not determines the sorting order of the data, but is
  non_clustered_key~nonclustkey~intended purely for query performance optimization.
  north_azimuth~northaz~The north_azimuth element provides the value of the angle
  north_azimuth~northaz~between a line from the image center to the north pole and
  north_azimuth~northaz~a reference line in the image plane.  The reference line is
  north_azimuth~northaz~a horizontal line from the image center to the middle right
  north_azimuth~northaz~edge of the image.
  north_azimuth~northaz~This angle increases in a clockwise direction.
  not_applicable_constant~notapplconst~The not_applicable_constant element supplies the numeric
  not_applicable_constant~notapplconst~value used to represent the figurative constant 'N/A'.
  not_applicable_constant~notapplconst~'N/A' (Not Applicable) is defined as indicating when values
  not_applicable_constant~notapplconst~within the domain of a particular data element do not apply
  not_applicable_constant~notapplconst~in a specific instance.
  note~note~The note element is a text field which provides
  note~note~miscellaneous notes or comments (for example, concerning a
  note~note~given data set or a given data processing program).
  notebook_entry_time~noteentrytm~The notebook_entry_time element provides the date and time
  notebook_entry_time~noteentrytm~at which an experimenter made a particular entry in the
  notebook_entry_time~noteentrytm~experimenter notebook.
  notebook_entry_time~noteentrytm~Formation rule: YYYY-MM-DDThh:mm:ss[.fff]
  nssdc_data_set_id~nssdcdsid~The nssdc_data_set_id element is the identifier used by
  nssdc_data_set_id~nssdcdsid~the NSSDC for a data set or data product.  A PDS data set
  nssdc_data_set_id~nssdcdsid~or collection may have one or more associated NSSDC
  nssdc_data_set_id~nssdcdsid~data sets.
  ntv_sat_time_from_closest_aprh~ntvstmeclsap~ The ntv_sat_time_from_closest_aprh (native satellite time from closest
  ntv_sat_time_from_closest_aprh~ntvstmeclsap~approach) element provides the time from closest approach to the
  ntv_sat_time_from_closest_aprh~ntvstmeclsap~satellite. This should not be confused with
  ntv_sat_time_from_closest_aprh~ntvstmeclsap~NTV_TIME_FROM_CLOSEST_APPROACH which is the time from closest approach
  ntv_sat_time_from_closest_aprh~ntvstmeclsap~to the central body.  The format is +/- DDDHHMMSS, where negative
  ntv_sat_time_from_closest_aprh~ntvstmeclsap~refers to Days,Hours, Minutes, Seconds before the encounter.
  ntv_time_from_closest_approach~ntvtmeclsapr~ The ntv_time_from_closest_approach (native time from closest approach)
  ntv_time_from_closest_approach~ntvtmeclsapr~element  provides the time from closest approach to the central body.
  ntv_time_from_closest_approach~ntvtmeclsapr~The format is +/- DDDHHMMSS, where negative refers to Days, Hours,
  ntv_time_from_closest_approach~ntvtmeclsapr~Minutes, Seconds before the encounter.
  object_classification_type~objclasstype~The object_classification_type element identifies a defined
  object_classification_type~objclasstype~object with a classification specified by the defining data
  object_classification_type~objclasstype~system.
  object_type~objecttype~The object_type data element indicates a system-specific
  object_type~objecttype~categorization for a data object.  Example:  GENERIC,
  object_type~objecttype~SPECIFIC.  In the PDS, the difference between generic and
  object_type~objecttype~specific objects is illustrated in the PDS Data Preparation
  object_type~objecttype~Workbook.
  object_name~objname~The object_name element provides the template object name
  object_name~objname~assigned by the Central Node data administrator to a logical
  object_name~objname~template used in the PDS.
  obliquity~obliquity~The obliquity element provides the value of the angle
  obliquity~obliquity~between the plane of the equator and the orbital plane of a
  obliquity~obliquity~target body.
  observation_id~obsid~The observation_id element uniquely identifies a scientific observation
  observation_id~obsid~within a data set.
  observation_id~obsid~Note: For Galileo the observation_id is in
  observation_id~obsid~the form NNTIOOOOOOMM#SSSXXXX. Where NN is the orbit
  observation_id~obsid~number, T is the scan platform target body initial (if
  observation_id~obsid~applicable), I is the instrument, oooooo is the orbit
  observation_id~obsid~planning guide objective mnemonic, MM is the sequential
  observation_id~obsid~OAPEL number for each value of NNTIOOOOOO, # is the
  observation_id~obsid~multiple observation flag symbol (- or +), SSS is the PA
  observation_id~obsid~set number and XXXX is the MIPL processing code.
  observation_time~obstime~The observation_time element provides the date and time of
  observation_time~obstime~the midpoint between the start and end times (spacecraft,
  observation_time~obstime~ground-based, or system event) in UTC system format.
  obstruction_id~obstrctionid~The obstruction_id element identifies a boom or other obstruction block-
  obstruction_id~obstrctionid~ing the view of an instrument during an observation.  For example, the
  obstruction_id~obstrctionid~Galileo SSI is occasionally blocked by a boom.
  observation_type~obstype~The observation_type element identifies the general type of
  observation_type~obstype~an observation.
  offset~offset~The offset element indicates a shift or displacement of a
  offset~offset~data value.  See also: scaling_factor.
  offset~offset~Note:  Expressed as an equation:  true value = offset value
  offset~offset~+ (scaling factor x stored value).
  offset_mode_id~offsetmodeid~The offset_mode_id identifies the analog value that is
  offset_mode_id~offsetmodeid~subtracted from the video signal prior to the
  offset_mode_id~offsetmodeid~analog/digital converters.
  offset_number~offsetnum~The OFFSET_NUMBER indicates the offset value used in the analog to
  offset_number~offsetnum~digital conversion.  The OFFSET_NUMBER times a constant is the voltage
  offset_number~offsetnum~value added to the measured voltage signal before digitization.
  on_chip_mosaic_flag~onchpmosflg~ Galileo Solid State Imaging-specific. The on_chip_mosaic_flag element
  on_chip_mosaic_flag~onchpmosflg~indicates whether the image is part of a multiple exposure/single
  on_chip_mosaic_flag~onchpmosflg~read-out mode, or ON_CHIP_MOSAIC.  For example, four images of the
  on_chip_mosaic_flag~onchpmosflg~target-body are acquired by slewing the camera to image the target at
  on_chip_mosaic_flag~onchpmosflg~each of the four corners of the Charged Coupled Device (CCD) array. The
  on_chip_mosaic_flag~onchpmosflg~CCD read-out is suppressed until all four exposures are completed, thus
  on_chip_mosaic_flag~onchpmosflg~resulting in a 2X2 mosaic. An on chip mosaic is not limited to a 2x2
  on_chip_mosaic_flag~onchpmosflg~mosaic, it can be an nxm mosaic.
  on_line_identification~onlineid~ The on_line_identification element is a unique identifier
  on_line_identification~onlineid~for product resources which are on-line. It may be a URL to
  on_line_identification~onlineid~a home page, an e-mail address, an ftp site or a jukebox. An
  on_line_identification~onlineid~on_line_identification element may be associated with a
  on_line_identification~onlineid~data set, data set collection, mission, instrument, host,
  on_line_identification~onlineid~target or volume.
  on_line_name~onlinenm~ The on_line_name element is a unique name which corresponds to
  on_line_name~onlinenm~a given on_line_identification element.  It is used to create HTML
  on_line_name~onlinenm~links to appropriate home pages.
  operational_consid_desc~operconsidd~The operational_consid_desc element provides
  operational_consid_desc~operconsidd~a brief description of operational characteristics which
  operational_consid_desc~operconsidd~affect the measurements made by an instrument.
  operating_system_id~opersystemid~The operating_system_id element identifies the computer
  operating_system_id~opersystemid~operating system and version of the operating system on
  operating_system_id~opersystemid~which data were manipulated, (e.g., VMS 4.6,UNIX SYSTEM
  operating_system_id~opersystemid~5, DOS 4.0, MAC).
  operations_contact_pds_user_id~opspdsuserid~The operations_contact_pds_user_id element provides the
  operations_contact_pds_user_id~opspdsuserid~pds_user_id of the operations contact at a node.
  optional_element_set~optelemntset~The optional_element_set element identifies the data
  optional_element_set~optelemntset~elements that are optional members of a defined object.
  optional_element_set~optelemntset~Note:  In the PDS, the data elements listed in this set
  optional_element_set~optelemntset~must be approved for inclusion in the data dictionary.
  optics_desc~opticsd~The optics_desc element provides a textual
  optics_desc~opticsd~description of the physical and operational characteristics
  optics_desc~opticsd~of the optics of an instrument.
  optional_object_set~optobjectset~The optional_object_set element identifies the ODL objects
  optional_object_set~optobjectset~that are optional members of a defined object.
  orbit_direction~orbdir~The orbit_direction element provides the direction of
  orbit_direction~orbdir~movement along the orbit about the primary as seen from the
  orbit_direction~orbdir~north pole of the 'invariable plane of the solar system',
  orbit_direction~orbdir~which is the plane passing through the center of mass of the
  orbit_direction~orbdir~solar system and perpendicular to the angular momentum vect
  orbit_direction~orbdir~or of the solar system orbit motion.  PROGRADE for positive
  orbit_direction~orbdir~rotation according to the right-hand rule, RETROGRADE for ne
  orbit_direction~orbdir~gative rotation.  See also: orbital_inclination
  orbital_eccentricity~orbecc~The orbital_eccentricity provides a measure of the non-circularity of an
  orbital_eccentricity~orbecc~orbit.  Circular orbits have eccentricities of 0, elliptical orbits have
  orbital_eccentricity~orbecc~eccentricities between 0 and 1, parabolic trajectories have eccentrici-
  orbital_eccentricity~orbecc~ties of 1, and hyperbolic trajectories have eccentricities greater than
  orbital_eccentricity~orbecc~1.
  orbital_inclination~orbincln~The orbital_inclination element provides the value of the
  orbital_inclination~orbincln~angle between the orbital plane of a target body and the
  orbital_inclination~orbincln~ecliptic.  The body's orbit direction is prograde if 0 < i
  orbital_inclination~orbincln~ 90 degrees, where i is the value of orbital inclination.
  orbital_inclination~orbincln~The orbit direction is retrograde if 90 < i < 180 degrees.
  orbit_stop_number~orbitstopnum~The orbit_stop_number is an alias for stop_orbit_number used
  orbit_stop_number~orbitstopnum~exclusively by the AMMOS-MGN KEY_TIMES data file.
  orbit_stop_time~orbitstoptm~The orbit_stop_time element is an alias for stop_time used
  orbit_stop_time~orbitstoptm~exclusively by AMMOS-MGN ephemeris files.
  orbit_start_number~orbitstrtnum~The orbit_start_number is an alias for start_orbit_number
  orbit_start_number~orbitstrtnum~used exclusively by the AMMOS-MGN KEY_TIMES data file.
  orbit_start_time~orbitstrttm~The orbit_start_time element is an alias for start_time used
  orbit_start_time~orbitstrttm~exclusively by AMMOS-MGN ephemeris files.
  orbit_number~orbnum~The orbit_number element identifies the number of the
  orbit_number~orbnum~orbital revolution of the spacecraft around a target body.
  orbit_number~orbnum~Note:  In PDS Magellan altimetry and radiometry labels,
  orbit_number~orbnum~the orbit_number data element refers to the Magellan
  orbit_number~orbnum~orbit number corresponding to the following files:
  orbit_number~orbnum~ephemeris, altimetry, and radiometry.
  orbital_semimajor_axis~orbsemimajax~The orbital_semimajor_axis element provides the value of
  orbital_semimajor_axis~orbsemimajax~the semimajor axis of the orbit of a target body.  The
  orbital_semimajor_axis~orbsemimajax~semimajor axis is one_half of the maximum dimension of an
  orbital_semimajor_axis~orbsemimajax~orbit.
  order_date~orddate~The order_date element provides the date of when an order
  order_date~orddate~was placed for a data set.
  order_number~ordnum~The order_number element is a unique system_generated
  order_number~ordnum~number which is used to identify an order.
  order_status~ordstatus~The order_status element provides the status associated with
  order_status~ordstatus~ orders and order items accepted by the PDS order function.
  order_status_desc~ordstatusd~The order_status_desc element details the status of an
  order_status_desc~ordstatusd~order.
  order_status_id~ordstatusid~The order_status_id element identifies the status of an
  order_status_id~ordstatusid~order.
  order_status_time~ordstatustm~The order_status_time element gives the date (and time,
  order_status_time~ordstatustm~where applicable) as of which the status of an order was
  order_status_time~ordstatustm~changed.
  order_status_time~ordstatustm~Formation rule: YYYY-MM-DDThh:mm:ss[.fff]
  order_status_date~ordstsdate~The order_status_date element provides the effective date
  order_status_date~ordstsdate~of an order status change.
  order_type~ordtype~The order_type element identifies the type of order placed
  order_type~ordtype~by a user of the PDS.  Example values:  PR=product orders,
  order_type~ordtype~CD=CD-ROM fast track orders.
  original_product_id~origprodid~The original_product_id element provides the temporary
  original_product_id~origprodid~product identifier that was assigned to a product during
  original_product_id~origprodid~active flight operations which was eventually replaced by a
  original_product_id~origprodid~permanent id (see product_id).
  output_flag~outputflag~The output_flag element indicates whether standard values
  output_flag~outputflag~shall be output for hardcopy display.
  parent_template~parenttmplt~The parent_template element contains the name of the
  parent_template~parenttmplt~template which provides the loader software with a keyword
  parent_template~parenttmplt~value which occurred elsewhere in the same or a different
  parent_template~parenttmplt~template.  For example:  the value for the data_set_id
  parent_template~parenttmplt~keyword is required in several templates to map the
  parent_template~parenttmplt~template information to the proper dataset, yet to avoid
  parent_template~parenttmplt~redundant data supplier effort it appears only on the
  parent_template~parenttmplt~DATASET template.  For these templates, the parenttmplt
  parent_template~parenttmplt~provides the source of the data_set_id value, i.e. the
  parent_template~parenttmplt~DATASET template.
  parameter_desc~parmd~The parameter_desc element defines the input or output
  parameter_desc~parmd~parameter identified by the parameter_name element,
  parameter_desc~parmd~including units, derivation (where applicable), and
  parameter_desc~parmd~associated parameters.
  parameter_name~parmname~The parameter_name element identifies a parameter input to
  parameter_name~parmname~or output from a program or algorithm.
  parameter_sequence_number~parmseqnum~The parameter_sequence_number element provides an ordering
  parameter_sequence_number~parmseqnum~sequence number for parameters used in user views and
  parameter_sequence_number~parmseqnum~associated queries.
  parameter_type~parmtype~The parameter_type element provides the type of parameter
  parameter_type~parmtype~(input or output) used in user views and associated queries.
  particle_species_name~partspecsnm~The particle_species_name element provides the name of a
  particle_species_name~partspecsnm~particle detected by a given instrument.  Example values:
  particle_species_name~partspecsnm~ELECTRON, ION, PROTON, HYDROGEN, HELIUM, OXYGEN, etc.  For
  particle_species_name~partspecsnm~ions, the specific atomic number designation may be used
  particle_species_name~partspecsnm~(e.g., Z=1, Z=2, Z=8, etc.).
  pass_number~passnumber~The pass_number data element indicates the number of days
  pass_number~passnumber~since initial spacecraft signal acquisition.
  path_name~pathname~The path_name data element identifies the full directory
  path_name~pathname~path -- excluding the file name -- used to locate a file on
  path_name~pathname~a storage medium or online system.  To allow the indication
  path_name~pathname~of the full path and file name within a descriptive label,
  path_name~pathname~this data element is meant to be used in conjunction with
  path_name~pathname~the file_name data element.
  path_name~pathname~ 
  path_name~pathname~NOTE:  In the PDS, the path_name data element is expressed
  path_name~pathname~according to the UNIX convention, using forward slashes to
  path_name~pathname~delimit directories.  While the leading slash  denoting the
  path_name~pathname~root directory is omitted, the final slash is used.
  pds_affiliation~pdsaffil~ The pds_affiliation data element describes the type of
  pds_affiliation~pdsaffil~relationship an individual has with a PDS node. (e.g.,
  pds_affiliation~pdsaffil~staff, advisory group, etc..)
  pds_user_id~pdsuserid~The pds_user_id element provides a unique identifier for
  pds_user_id~pdsuserid~each individual who is allowed access to the PDS. The system
  pds_user_id~pdsuserid~manager at the Central Node assigns this identifier at the
  pds_user_id~pdsuserid~time of user registration.
  pds_version_id~pdsversionid~The PDS_version_id data element represents the version
  pds_version_id~pdsversionid~number of the PDS standards documents that is valid
  pds_version_id~pdsversionid~when a data product label is created.  Values for the
  pds_version_id~pdsversionid~PDS_version_id are formed by appending the integer for
  pds_version_id~pdsversionid~the latest version number to the letters 'PDS'.  Examples:
  pds_version_id~pdsversionid~PDS3, PDS4.
  peer_review_id~peerrevwid~The peer_review_id element provides a unique identifier
  peer_review_id~peerrevwid~assigned by the bulk loading software to each peer review
  peer_review_id~peerrevwid~information set saved in the PDS data base.
  peer_review_role~peerrevwrole~The peer_review_role element provides the role of a member
  peer_review_role~peerrevwrole~of a peer review committee.
  peer_review_data_set_status~peerrvwdssts~The peer_review_data_set_status element provides status for
  peer_review_data_set_status~peerrvwdssts~data sets which have been peer reviewed.
  peer_review_results_desc~peerrvwrslts~The peer_review_results element provides the textual
  peer_review_results_desc~peerrvwrslts~description of the results of a peer review.
  periapsis_argument_angle~periargang~The periapsis_argument_angle element provides the value of
  periapsis_argument_angle~periargang~the periapsis argument angle, which is defined as the angle
  periapsis_argument_angle~periargang~measured from the ascending node of the orbit of a target
  periapsis_argument_angle~periargang~body (relative to the reference plane) to the point in the
  periapsis_argument_angle~periargang~orbit at which the target body obtains its closest approach
  periapsis_argument_angle~periargang~to the primary body.
  periapsis_argument_angle~periargang~See also: ascending_node_longitude.
  permission_flag~permflag~The permission_flag element indicates whether or not a query
  permission_flag~permflag~is orderable.
  person_institution_name~persinstnnm~The person_institution_name element identifies a university,
  person_institution_name~persinstnnm~research center, NASA center or other institution associated
  person_institution_name~persinstnnm~with an individual involved with the PDS.
  programming_language_name~pgmlangname~The programming_language_name element identifies the major
  programming_language_name~pgmlangname~programming language in which a given data processing
  programming_language_name~pgmlangname~program or algorithm is written.
  phase_information_flag~phinfoflg~ The phase_information_flag element is a yes-or-no flag
  phase_information_flag~phinfoflg~that indicates whether a ring occultation data set includes
  phase_information_flag~phinfoflg~information about the phase shift of a signal as it passes
  phase_information_flag~phinfoflg~through the ring plane.  A value of 'Y' indicates that the
  phase_information_flag~phinfoflg~data is intrinsically complex.  In general, this element
  phase_information_flag~phinfoflg~equals 'Y' for radio occultation data and 'N' for stellar
  phase_information_flag~phinfoflg~occultation data.
  phase_angle~phsang~The phase_angle element provides a measure of the relationship between
  phase_angle~phsang~the instrument viewing position and incident illumination (such as solar
  phase_angle~phsang~light).  Phase_angle is measured at the target;  it is the angle between
  phase_angle~phsang~a vector to the illumination source and a vector to the instrument.  If
  phase_angle~phsang~not specfied, the target is assumed to be at the center of the instrument
  phase_angle~phsang~field of view.  If illumination is from behind the instrument, phase_
  phase_angle~phsang~angle will be small.
  pi_pds_user_id~pipdsuserid~The pi_pds_user_id element provides the pds_user_id of the
  pi_pds_user_id~pipdsuserid~principal investigator associated with an instrument.
  planet_day_number~planetdaynum~The planet_day_number element indicates the number of sidereal days
  planet_day_number~planetdaynum~(rotation of 360 degrees) elapsed since a reference day (e.g., the day
  planet_day_number~planetdaynum~on which a landing vehichle set down).  Days are measured in rotations
  planet_day_number~planetdaynum~of the planer in question from the reference day (which is day zero).
  platform~platform~The platform element describes the available platforms which the
  platform~platform~software supports.
  platform_or_mounting_desc~platmountd~The platform_or_mounting_desc element describes the
  platform_or_mounting_desc~platmountd~spacecraft platform or laboratory mounting frame on which
  platform_or_mounting_desc~platmountd~an instrument is mounted.
  platform_or_mounting_name~platmountnm~The platform_or_mounting_name element identifies the
  platform_or_mounting_name~platmountnm~spacecraft platform or the laboratory mounting frame on
  platform_or_mounting_name~platmountnm~which an instrument is mounted.
  platform_or_mounting_name~platmountnm~Example values:  SCAN_PLATFORM, PROBE, MAGNETOMETER_BOOM.
  planetary_occultation_flag~poflag~ The planetary_occultation_flag element is a yes-or-no flag
  planetary_occultation_flag~poflag~that indicates whether a ring occultation track also
  planetary_occultation_flag~poflag~intersects the planet.
  pole_declination~poledecl~The pole_declination element provides the value of the
  pole_declination~poledecl~declination of the polar axis of a target body.  See
  pole_declination~poledecl~declination.
  pole_right_ascension~polera~The pole_right_ascension element provides the value of the
  pole_right_ascension~polera~right_ascension of the polar axis of a target body.  See
  pole_right_ascension~polera~right_ascension.
  position_time~positiontime~The position_time element provides the time when the
  position_time~positiontime~location information of an event is derived, in the
  position_time~positiontime~UTC system format.
  position_time~positiontime~Formation rule: YYYY-MM-DDThh:mm:ss[.fff]
  positive_longitude_direction~postvlondir~The positive_longitude_direction element identifies the
  positive_longitude_direction~postvlondir~direction of longitude (e.g. EAST, WEST) for a planet.  The
  positive_longitude_direction~postvlondir~IAU definition for direction of positive longitude is
  positive_longitude_direction~postvlondir~adopted.  Typically, for planets with prograde rotations,
  positive_longitude_direction~postvlondir~positive longitude direction is to the WEST.  For planets
  positive_longitude_direction~postvlondir~with retrograde rotations, positive longitude direction is
  positive_longitude_direction~postvlondir~to the EAST.
  positive_longitude_direction~postvlondir~ 
  positive_longitude_direction~postvlondir~Note:  The positive_longitude_direction keyword should be used for
  positive_longitude_direction~postvlondir~planetographic systems.
  preference_id~preferenceid~The preference_id element indicates a user's
  preference_id~preferenceid~degree of preference for one of a set of alternatives (for
  preference_id~preferenceid~example, preference for a particular electronic mail system
  preference_id~preferenceid~such as Internet).
  preference_id~preferenceid~Values range from 1 to 4, with 1 indicating the highest
  preference_id~preferenceid~preference.
  primary_body_name~primbodyname~The primary_body_name element identifies the primary body
  primary_body_name~primbodyname~with which a given target body is associated as a secondary
  primary_body_name~primbodyname~body.
  processing_control_parm_name~procctlprmnm~The processing_control_parm_name element identifies a
  processing_control_parm_name~procctlprmnm~parameter which allows a user to tailor a program or an
  processing_control_parm_name~procctlprmnm~algorithm to specific needs, such as outputting planetary
  processing_control_parm_name~procctlprmnm~surface coordinates in planetocentric or planetographic
  processing_control_parm_name~procctlprmnm~coordinates, specifying the units of the parameters to be
  processing_control_parm_name~procctlprmnm~plotted or specifying the scale of a map to be output.
  process_time~processtime~Alias within AMMOS for product_creation_time.
  process_time~processtime~Note:  This element is retained for use by Magellan AMMOS data
  process_time~processtime~products only.  New products should use
  process_time~processtime~product_creation_time.
  processing_history_text~prochisttext~The processing_history_text element provides an entry for
  processing_history_text~prochisttext~each processing step and program used in generating a
  processing_history_text~prochisttext~particular data file.
  processing_level_desc~proclvld~The processing_level_desc element provides the
  processing_level_desc~proclvld~CODMAC standard definition corresponding to a particular
  processing_level_desc~proclvld~processing_level_id value.
  processing_level_desc~proclvld~Note:  For a fuller definition of CODMAC processing levels,
  processing_level_desc~proclvld~please refer to the PDS Standards Reference.
  processing_level_id~proclvlid~The processing_level_id element identifies the
  processing_level_id~proclvlid~processing level of a set of data according to the
  processing_level_id~proclvlid~eight_level CODMAC standard.
  processing_stop_time~procstoptime~The processing_stop_time element gives the ending date (and
  processing_stop_time~procstoptime~time, where appropriate) of processing for a particular set
  processing_stop_time~procstoptime~of data.
  processing_stop_time~procstoptime~Formation rule: YYYY-MM-DDThh:mm:ss[.fff]
  processing_start_time~procstrttime~The processing_start_time element gives the beginning date
  processing_start_time~procstrttime~(and time, where appropriate) of processing for a particular
  processing_start_time~procstrttime~set of data.
  processing_start_time~procstrttime~Formation rule: YYYY-MM-DDThh:mm:ss[.fff]
  process_version_id~procverid~The process_version_id element identifies the version (e.g.,
  process_version_id~procverid~the method of processing) of a mosaic.
  product_creation_time~prodcreatetm~The product_creation_time element defines the UTC system format
  product_creation_time~prodcreatetm~time when a product was created.
  product_creation_time~prodcreatetm~Formation rule: YYYY-MM-DDThh:mm:ss[.fff]
  product_data_set_id~proddsid~The product_data_set_id element provides the data_set_id  of
  product_data_set_id~proddsid~a cataloged data set that resulted from the
  product_data_set_id~proddsid~application of the processing software to the source data
  product_data_set_id~proddsid~sets. The data set name associated with the product data set
  product_data_set_id~proddsid~is provided by the data_set_name element.
  producer_full_name~prodfullname~The producer_full_name element provides the full_name of the
  producer_full_name~prodfullname~individual mainly responsible for the production of a data
  producer_full_name~prodfullname~set.  See also:  full_name.
  producer_full_name~prodfullname~Note:  This individual does not have to be registered with
  producer_full_name~prodfullname~the PDS.
  producer_institution_name~prodinstnnm~The producer_institution_name element identifies a
  producer_institution_name~prodinstnnm~university, research center, NASA center or other
  producer_institution_name~prodinstnnm~institution associated with the production of a data set.
  producer_institution_name~prodinstnnm~This would generally be an institution associated with the
  producer_institution_name~prodinstnnm~element producer_full_name.
  product_release_date~prodrlsedate~The product_release_date data element identifies the date
  product_release_date~prodrlsedate~on which a particular data product is released from one
  product_release_date~prodrlsedate~system or process to another, according to system- or
  product_release_date~prodrlsedate~application-specific criteria.
  product_release_date~prodrlsedate~Formation rule:  YYYY-MM-DD
  producer_id~producerid~The producer_id element provides a short name or acronym for
  producer_id~producerid~the producer or producing team/group of a dataset.
  product_id~productid~The product_id data element represents a permanent, unique
  product_id~productid~identifier assigned to a data product by its producer.
  product_id~productid~See also:  source_product_id.
  product_id~productid~Note:  In the PDS, the value assigned to product_id must
  product_id~productid~be unique within its data set.
  product_id~productid~Additional note: The product_id can describe the
  product_id~productid~lowest-level data object that has a PDS label.
  product_name~productname~The PRODUCT_NAME element provides the full name of a
  product_name~productname~product. It is related to product_id and provides a brief,
  product_name~productname~descriptive title for a particular data product (i.e., a
  product_name~productname~single file).
  product_type~producttype~The PRODUCT_TYPE data element identifies the type or
  product_type~producttype~category of a data product within a data set.  Examples:
  product_type~producttype~EDR, UDR.
  product_version_id~prodverid~The product_version_id element identifies the version
  product_version_id~prodverid~of an individual product within a data set.  Example:
  product_version_id~prodverid~1.0, 2A, 1.2.3C.
  product_version_id~prodverid~Note: This is not the same as the data set version that is
  product_version_id~prodverid~an element of the data_set_id value.  Product_version_id is
  product_version_id~prodverid~intended for use within AMMOS to identify separate iterations
  product_version_id~prodverid~of a given product, which will also have a unique file_name.
  product_version_type~prodvertype~The product_version_type element identifies the version of
  product_version_type~prodvertype~an individual data product.  It can be applied to any type
  product_version_type~prodvertype~of data that might appear in several incarnations, including
  product_version_type~prodvertype~ephemeris files, sequence files, or software.  Example
  product_version_type~prodvertype~values:  VERSION 1, PREDICT, ACTUAL, DRAFT, PRELIMINARY,
  product_version_type~prodvertype~FINAL, REVISION A.
  projected_star_diameter~projstardiam~ The projected_star_diameter element indicates the
  projected_star_diameter~projstardiam~projected linear diameter of a star at the distance of the
  projected_star_diameter~projstardiam~given planet, during a stellar occultation experiment.
  protocol_type~protocoltype~The protocol_type element identifies the protocol type for
  protocol_type~protocoltype~the on_line_identification element.  Example value: URL,
  protocol_type~protocoltype~FTP, E-MAIL.
  publication_date~publdate~The publication_date element provides the date when a
  publication_date~publdate~published item, such as a document or a compact disc, was
  publication_date~publdate~issued.
  publication_date~publdate~Formation rule:  YYYY-MM-DD
  right_ascension~ra~The right_ascension element provides the right ascension
  right_ascension~ra~value. Right_ascension is defined as the arc of the
  right_ascension~ra~celestial equator between the vernal equinox and the point
  right_ascension~ra~where the hour circle through the given body intersects the
  right_ascension~ra~Earth's mean equator (reckoned eastward).  See declination.
  radial_resolution~radres~ The radial_resolution element indicates the nominal radial
  radial_resolution~radres~distance over which changes in ring properties can be
  radial_resolution~radres~detected within a data product.  Note that this value may
  radial_resolution~radres~be larger than the radial_sampling_interval value, since
  radial_resolution~radres~many data products are over-sampled.
  radial_sampling_interval~radsamint~ The radial_sampling_interval element indicates the average
  radial_sampling_interval~radsamint~radial spacing between consecutive points in a ring
  radial_sampling_interval~radsamint~profile.  In practice, this may be somewhat smaller than
  radial_sampling_interval~radsamint~the radres element because the profile may be
  radial_sampling_interval~radsamint~over-sampled.
  radiance_scaling_factor~radscalfact~The radiance_scaling_factor element provides the constant value by which
  radiance_scaling_factor~radscalfact~a stored radiance is multiplied.
  radiance_scaling_factor~radscalfact~Note:  Expressed as an equation:    true_radiance_value =
  radiance_scaling_factor~radscalfact~    radiance_offset + radiance_scaling_factor * stored_radiance_value.
  radiance_scaling_factor~radscalfact~Use of this element is discouraged in favor of the more general scaling_
  radiance_scaling_factor~radscalfact~factor.
  rationale_desc~ratld~The rationale_desc element describes the rationale for
  rationale_desc~ratld~performing a particular observation.
  receiver_description~receiverdesc~ The receiver_description element describes a given
  receiver_description~receiverdesc~receiving instrument.
  receiver_id~receiverid~ The receiver_id element provides an abbreviated name or
  receiver_id~receiverid~acronym which identifies a receiving instrument.  It is
  receiver_id~receiverid~used for experiments that have both transmitting and
  receiver_id~receiverid~receiving instruments, in which case the instrument_id
  receiver_id~receiverid~element refers to the transmitter.
  receiver_name~receivername~ The receiver_name element provides the unique full name of
  receiver_name~receivername~a receiving instrument.  It is used for experiments that
  receiver_name~receivername~have both transmitting and receiving instruments, in which
  receiver_name~receivername~case the instrument_name element refers to the transmitter.
  record_bytes~recordbytes~The record_bytes element indicates the number of bytes in a
  record_bytes~recordbytes~physical file record, including record terminators and
  record_bytes~recordbytes~separators.
  record_bytes~recordbytes~Note:  In the PDS, the use of record_bytes, along
  record_bytes~recordbytes~with other file-related data elements is fully described in
  record_bytes~recordbytes~the Standards Reference.
  record_format~recordfmt~The RECORD_FORMAT element contains a FORTRAN-style format
  record_format~recordfmt~description for reading an entire row of an ASCII/EBCDIC
  record_format~recordfmt~table, or an entire occurrence of an ASCII/EBCDIC
  record_format~recordfmt~COLLECTION.  Example:  RECORD_FORMAT =
  record_format~recordfmt~'(F8.3,1X,I5,2X,A12)'  Note that this is an INPUT format
  record_format~recordfmt~only, and may not contain string constant expressions
  record_format~recordfmt~within the format.
  records~records~The records data element identifies the number of physical
  records~records~records in a file or other data object.
  record_type~recordtype~The record_type element indicates the record format of a
  record_type~recordtype~file.
  record_type~recordtype~Note:  In the PDS, when record_type is used in a
  record_type~recordtype~detached label file it always describes its corresponding
  record_type~recordtype~detached data file, not the label file itself.
  record_type~recordtype~The use of record_type along with other file-related data
  record_type~recordtype~elements is fully described in the Data Preparation
  record_type~recordtype~Workbook.
  reference_desc~refd~The reference_desc element provides a complete bibliographic citation
  reference_desc~refd~for a published work.  The format for such citations is that employed
  reference_desc~refd~by the Journal of Geophysical Research (JGR).  This format is described
  reference_desc~refd~in the JGR, Volume 98, No. A5, Pages 7849-7850, May 1, 1993 under
  reference_desc~refd~'References'.  Data suppliers may also refer to recent issues of the
  reference_desc~refd~Journal for examples of citations.  Elements of a complete bibliographic
  reference_desc~refd~citation must include, wherever applicable, author(s) or editor(s), title,
  reference_desc~refd~journal name, volume number, page range and publication date (for journal
  reference_desc~refd~article citations), or page range, publisher, place of publication, and
  reference_desc~refd~publication date (for book citations).
  reference_key_id~refkeyid~The reference_key_id element provides the catalog with
  reference_key_id~refkeyid~an identifier for a reference document.  Additionally, it
  reference_key_id~refkeyid~may be used in various catalog descriptions, for example
  reference_key_id~refkeyid~in data_set_desc, as a shorthand notation of a document
  reference_key_id~refkeyid~reference.
  reference_key_id~refkeyid~The reference_key_id element is composed according to the
  reference_key_id~refkeyid~following guidelines:
  reference_key_id~refkeyid~1.  if there is an author for the publication, the general
  reference_key_id~refkeyid~rule is:
  reference_key_id~refkeyid~  REFERENCE_KEY_ID = <author's last name><year><letter>,
  reference_key_id~refkeyid~     where
  reference_key_id~refkeyid~     <author's last name> is a maximum of 15 characters,
  reference_key_id~refkeyid~          and may need to be truncated.
  reference_key_id~refkeyid~     <year> is 4 characters for the year published.
  reference_key_id~refkeyid~     <letter> is optional and consist of one character
  reference_key_id~refkeyid~           used to distinguish multiple papers by the
  reference_key_id~refkeyid~           same author(s) in the same year.
  reference_key_id~refkeyid~   The following variations apply:
  reference_key_id~refkeyid~   a.  If there is one author:
  reference_key_id~refkeyid~    <author's last name><year>
  reference_key_id~refkeyid~    Example value:  SCARF1980
  reference_key_id~refkeyid~   b.  If there are two authors:
  reference_key_id~refkeyid~    <first author's last name>&<second author's last name>
  reference_key_id~refkeyid~    <year>
  reference_key_id~refkeyid~    Example value:  SCARF&GURNETT1977
  reference_key_id~refkeyid~  c . If there are three or more authors:
  reference_key_id~refkeyid~    <first author's last name>ETAL<year>
  reference_key_id~refkeyid~    Example value:  GURNETTETAL1979
  reference_key_id~refkeyid~   d.  If one author has the same last name as another:
  reference_key_id~refkeyid~    <author's last name>,<author's first initial>
  reference_key_id~refkeyid~    <year published>
  reference_key_id~refkeyid~    Example value:  FREUD,A1935
  reference_key_id~refkeyid~   e.  If the same author(s) published more than one paper
  reference_key_id~refkeyid~    in the same year:
  reference_key_id~refkeyid~      <author's last name><year><letter>
  reference_key_id~refkeyid~      or
  reference_key_id~refkeyid~      <first author's last name>&<second author's last name>
  reference_key_id~refkeyid~      <year><letter>
  reference_key_id~refkeyid~      or
  reference_key_id~refkeyid~      <first author's last name>ETAL<year><letter>
  reference_key_id~refkeyid~    Example values:  SCARF1980A
  reference_key_id~refkeyid~                     SCARF&GURNETT1977B
  reference_key_id~refkeyid~   f.  In cases where an initial reference has been
  reference_key_id~refkeyid~    catalogued and published on an Archive medium and
  reference_key_id~refkeyid~    subsequent references for the same author and same
  reference_key_id~refkeyid~    year are needed at a later date, the following rule
  reference_key_id~refkeyid~    applies:
  reference_key_id~refkeyid~    Leave the original reference as is, and add a letter
  reference_key_id~refkeyid~    to the subsequent references starting with the letter
  reference_key_id~refkeyid~    'B' since the original reference will now be assumed
  reference_key_id~refkeyid~    to have an implicit 'A'.  For example:  PFORD1991,
  reference_key_id~refkeyid~    PFORD1991B.
  reference_key_id~refkeyid~    Note that if the initial reference has only been
  reference_key_id~refkeyid~    catalogued and not yet published, then it can be
  reference_key_id~refkeyid~    modified such that the 'A' is explicit, i.e.
  reference_key_id~refkeyid~    PFORD1991A.
  reference_key_id~refkeyid~2.  If there is no author for the publication, the general
  reference_key_id~refkeyid~rule is:
  reference_key_id~refkeyid~ REFERENCE_KEY_ID = <journal name><document identification>
  reference_key_id~refkeyid~ where
  reference_key_id~refkeyid~ <journal name> is a maximum of 10 characters, and
  reference_key_id~refkeyid~      may need to be abbreviated
  reference_key_id~refkeyid~ <document identification> is a maximum of 10
  reference_key_id~refkeyid~      characters.  This id may consist of a volume number,
  reference_key_id~refkeyid~      and/or document or issue number, and/or year of
  reference_key_id~refkeyid~      publication.
  reference_key_id~refkeyid~     Example values:  SCIENCEV215N4532
  reference_key_id~refkeyid~                      JGRV88
  reference_key_id~refkeyid~                      JPLD-2468
  reference_latitude~reflat~The reference_latitude element provides the new zero
  reference_latitude~reflat~latitude in a rotated spherical coordinate system that was
  reference_latitude~reflat~used in a given map_projection_type.
  reference_longitude~reflon~The reference_longitude element defines the zero longitude
  reference_longitude~reflon~in a rotated spherical coordinate system that was used in a
  reference_longitude~reflon~given map_projection_type.
  reflectance_scaling_factor~reflscalfact~The reflectance_scaling_factor element identifies the
  reflectance_scaling_factor~reflscalfact~conversion factor from DN to reflectance.
  reference_object_name~refobjname~The reference_object_name element identifies the point,
  reference_object_name~refobjname~vector, or plane used as the origin from which an angle or
  reference_object_name~refobjname~a distance is measured.
  reference_object_name~refobjname~As an example, the reference object could be the center of
  reference_object_name~refobjname~a given planet (a point), the spacecraft z_axis (a vector)
  reference_object_name~refobjname~or the equatorial plane.
  reference_radial_resolution~refradres~ The reference_radial_resolution element specifies a
  reference_radial_resolution~refradres~reference radial resolution to which a ring occultation
  reference_radial_resolution~refradres~data set may be reprocessed. It is used to specify a
  reference_radial_resolution~refradres~standard radial resolution so that the noise properties of
  reference_radial_resolution~refradres~different data products may be more reliably compared.  The
  reference_radial_resolution~refradres~values of the parameters lowest_detectable_opacity,
  reference_radial_resolution~refradres~highest_detectable_opacity and scaled_noise_level depend on
  reference_radial_resolution~refradres~this value.
  reference_target_name~reftargname~The reference_target_name element provides the name of the
  reference_target_name~reftargname~target body being used as the reference to help define a
  reference_target_name~reftargname~particular vector_component_id.
  reference_target_name~reftargname~For example, the RJ\$ vector component is defined with the
  reference_target_name~reftargname~spacecraft as the reference target.
  registration_date~regdate~The registration_date element provides the date as of which
  registration_date~regdate~an individual is registered as an authorized user of the PDS
  registration_date~regdate~system.
  registration_date~regdate~Formation rule:  YYYY-MM-DD
  region_desc~regiond~The region_desc element describes a particular
  region_desc~regiond~region of a planetary surface, indicating its historical
  region_desc~regiond~significance, identifying major geological features and
  region_desc~regiond~providing other descriptive information.
  region_name~regionname~The region_name element identifies a region of a planetary
  region_name~regionname~surface.  In many cases, the name of a region derives from
  region_name~regionname~the major geologic features found within the region.
  remote_node_privileges_id~remnodeprvid~The remote_node_priviledges_id element identifies the
  remote_node_privileges_id~remnodeprvid~systems at a remote node (or nodes) which a user is
  remote_node_privileges_id~remnodeprvid~priviledged to access.
  repetitions~repetitions~The repetitions data element within a data object such as
  repetitions~repetitions~a container, indicates the number of times that data object
  repetitions~repetitions~recurs.  See also:  items.
  repetitions~repetitions~Note:  In the PDS, the data element ITEMS is used for
  repetitions~repetitions~multiple occruuences of a single object, such as a column.
  repetitions~repetitions~REPETITIONS is used for multiple occurrences of a repeating
  repetitions~repetitions~group of objects, such as a container.  For fuller
  repetitions~repetitions~explanation of the use of these data elements, please refer
  repetitions~repetitions~to the PDS Standards Reference.
  required_element_set~reqelemntset~The required_element_set element identifies the data
  required_element_set~reqelemntset~elements that are mandatory members of a defined object.
  required_element_set~reqelemntset~Note:  In the PDS, the data elements listed in this set
  required_element_set~reqelemntset~must be approved for inclusion in the data dictionary.
  required_memory_bytes~reqmembytes~The required_memory_bytes element indicates the amount of
  required_memory_bytes~reqmembytes~memory, in bytes, required to run the subject software.
  required_object_set~reqobjectset~The required_object_set element identifies the ODL objects
  required_object_set~reqobjectset~that are mandatory  members of a defined object.
  required_storage_bytes~reqstorbytes~The required_storage_bytes element provides the number of bytes
  required_storage_bytes~reqstorbytes~required to store an uncompressed file. This value may be an
  required_storage_bytes~reqstorbytes~approximation and is used to ensure enough disk space is available for
  required_storage_bytes~reqstorbytes~the resultant file.  Note:  For Zip file labels, this keyword provides
  required_storage_bytes~reqstorbytes~the total size of all the data files in the Zip file after being
  required_storage_bytes~reqstorbytes~uncompressed.  For the software inventory template, this is often the
  required_storage_bytes~reqstorbytes~size of the uncompressed distribution tar file.
  request_desc~requestd~The request_desc element describes a user's request for
  request_desc~requestd~support.
  request_time~requesttime~The request_time element provides the date (and time, where
  request_time~requesttime~appropriate) at which a user's request was received by the
  request_time~requesttime~Customer Support function.
  required_flag~requiredflag~The required_flag data element indicates whether a data
  required_flag~requiredflag~element or object is needed for inclusion in a system or
  required_flag~requiredflag~process.
  required_flag~requiredflag~Note:  In the PDS, required_flag is used in data dictionary
  required_flag~requiredflag~tables to indicate whether a data element or object is a
  required_flag~requiredflag~required or optional component of a data object.
  resolution_desc~resd~The resolution_desc element describes the resolution of and
  resolution_desc~resd~the approach used to resolve a user's request for support.
  ring_event_start_time~restart~ The ring_event_start_time element indicates the starting
  ring_event_start_time~restart~instant of a data product as measured at the ring plane.
  ring_event_start_time~restart~This element differs from the observation start time
  ring_event_start_time~restart~because it allows for light travel time.
  resolution_time~restime~The resolution_time element provides the date (and time,
  resolution_time~restime~where appropriate) as of which a user's request is resolved.
  ring_event_stop_time~restop~ The ring_event_stop_time element indicates the stopping
  ring_event_stop_time~restop~instant of a data product as measured at the ring plane.
  ring_event_stop_time~restop~This element differs from the observation stop time because
  ring_event_stop_time~restop~it allows for light travel time.
  reticle_point_declination~retpointdecl~The reticle_point_declination element refers to the declination of the
  reticle_point_declination~retpointdecl~principle points of the camera.
  reticle_point_declination~retpointdecl~ 
  reticle_point_declination~retpointdecl~Note:  For the Clementine cameras the principle points are defined as the
  reticle_point_declination~retpointdecl~upper left pixel of the camera (line 1,sample 1), the upper right pixel
  reticle_point_declination~retpointdecl~(line 1, last sample), lower left (last line, sample 1), and lower right
  reticle_point_declination~retpointdecl~(last line, last sample).
  reticle_point_latitude~retpointlat~The reticle_point_latitude element provides the latitude of the surface
  reticle_point_latitude~retpointlat~intercept points of the principle points of the camera.
  reticle_point_latitude~retpointlat~ 
  reticle_point_latitude~retpointlat~Note:  For the Clementine cameras the principle points are defined as the
  reticle_point_latitude~retpointlat~upper left pixel of the camera (line 1,sample 1), the upper right pixel
  reticle_point_latitude~retpointlat~(line 1, last sample), lower left (last line, sample 1), and lower right
  reticle_point_latitude~retpointlat~(last line, last sample).
  reticle_point_longitude~retpointlon~The reticle_point_longitude element provides the longitude of the surface
  reticle_point_longitude~retpointlon~intercept points of the principle points of the camera.
  reticle_point_longitude~retpointlon~ 
  reticle_point_longitude~retpointlon~Note:  For the Clementine cameras the principle points are defined as the
  reticle_point_longitude~retpointlon~upper left pixel of the camera (line 1,sample 1), the upper right pixel
  reticle_point_longitude~retpointlon~(line 1, last sample), lower left (last line, sample 1), and lower right
  reticle_point_longitude~retpointlon~(last line, last sample).
  reticle_point_number~retpointnum~The reticle_point_number element provides the number of an
  reticle_point_number~retpointnum~image reticle point, as follows:  1  upper left, 3 - upper
  reticle_point_number~retpointnum~right, 5 - middle, 7 - lower left, 9 - lower right.
  reticle_point_ra~retpointra~The reticle_point_ra element refers to the right ascension of the
  reticle_point_ra~retpointra~principle points of the camera.
  reticle_point_ra~retpointra~ 
  reticle_point_ra~retpointra~Note:  For the Clementine cameras the principle points are defined as the
  reticle_point_ra~retpointra~upper left pixel of the camera (line 1,sample 1), the upper right pixel
  reticle_point_ra~retpointra~(line 1, last sample), lower left (last line, sample 1), and lower right
  reticle_point_ra~retpointra~(last line, last sample).
  revolution_number~revnum~The revolution_number element identifies the number of the
  revolution_number~revnum~observational pass of a spacecraft around a target body.
  revolution_number~revnum~Note:  The Clementine Mission used this element in place of
  revolution_number~revnum~orbit_number because orbit number changes half way through
  revolution_number~revnum~the observational pass over the Moon and would not be an
  revolution_number~revnum~ideal parameter when interrogating the data set.  The
  revolution_number~revnum~revolution number equals orbit number at the start of the
  revolution_number~revnum~observational pass.
  revolution_period~revper~The revolution_period element provides the time period of
  revolution_period~revper~revolution of a solar system object about its spin axis.
  peer_review_stop_date~revwstopdate~The peer_review_stop_date element provides the final date
  peer_review_stop_date~revwstopdate~for a peer review in YYYYMMDD format.
  peer_review_start_date~revwstrtdate~The peer_review_start_date element provides the beginning
  peer_review_start_date~revwstrtdate~date for a peer review in YYYYMMDD format.
  ring_event_time~ringeventt~ The ring_event_time element indicates the instant at which
  ring_event_time~ringeventt~a data product has been acquired as measured at the ring
  ring_event_time~ringeventt~plane.  This element differs from the observation instant
  ring_event_time~ringeventt~because it allows for light travel time.
  ring_longitude~ringlong~ The ring_longitude element specifies the inertial
  ring_longitude~ringlong~longitude of a ring feature relative to the prime meridian.
  ring_longitude~ringlong~ In planetary ring systems, the prime meridian is the
  ring_longitude~ringlong~ascending node of the planet's invariable plane on the
  ring_longitude~ringlong~Earth's mean equator of J2000.  Longitudes are measured in
  ring_longitude~ringlong~the direction of orbital motion along the planet's
  ring_longitude~ringlong~invariable plane to the ring's ascending node, and thence
  ring_longitude~ringlong~along the ring plane.\n
  ring_longitude~ringlong~Note: The invariable plane of a
  ring_longitude~ringlong~planet is equivalent to its equatorial plane for every
  ring_longitude~ringlong~ringed planet except Neptune.
  ring_occultation_direction~ringoccdir~ The ring_occultation_direction element indicates the
  ring_occultation_direction~ringoccdir~radial direction of a ring occultation track.
  ring_radius~ringrad~ The ring_radius element indicates a radial location within
  ring_radius~ringrad~a planetary ring system.  Radii are measured from the
  ring_radius~ringrad~center of the planet along the nominal ring plane.
  ring_system_summary~ringsyssmy~The ring_system_summary element provides a brief and
  ring_system_summary~ringsyssmy~general description of the rings or ring_like features
  ring_system_summary~ringsyssmy~associated with a particular solar system body.
  role_desc~roled~The role_desc element describes the role of an individual
  role_desc~roled~during his or her association with a particular institution.
  role_desc~roled~Note that the term 'role' is a more specific
  role_desc~roled~characterization of the individual's activities than is
  role_desc~roled~'specialty' (see the specialty_name element).
  rotation_direction~rotdir~The rotation_direction element provides the direction
  rotation_direction~rotdir~of rotation as viewed from the north pole of the 'invariable
  rotation_direction~rotdir~plane of the solar system', which is the plane passing
  rotation_direction~rotdir~through the center of mass of the solar system and
  rotation_direction~rotdir~perpendicular to the angular momentum vector of the solar
  rotation_direction~rotdir~system.  The value for this element is PROGRADE for counter
  rotation_direction~rotdir~-clockwise rotation, RETROGRADE for clockwise rotation and
  rotation_direction~rotdir~SYNCHRONOUS for satellites which are tidally locked with
  rotation_direction~rotdir~the primary.  Sidereal_rotation_period and rotation_directio
  rotation_direction~rotdir~n_type are unknown for a number of satellites, and are not
  rotation_direction~rotdir~applicable (N/A) for satellites which are tumbling.
  rotational_element_desc~rotelementd~The rotational_element_desc element describes the
  rotational_element_desc~rotelementd~standard used for the definition of a planet's pole
  rotational_element_desc~rotelementd~orientation and prime meridian.  The description defines
  rotational_element_desc~rotelementd~the right ascension and the declination values used to
  rotational_element_desc~rotelementd~define the planet pole, and the spin angle value of the
  rotational_element_desc~rotelementd~planet referenced to a standard time (typically EME1950 or
  rotational_element_desc~rotelementd~J2000 time is used).  Periodically, the right ascension,
  rotational_element_desc~rotelementd~declination, and spin values of the planets are updated by
  rotational_element_desc~rotelementd~the IAU/IAG/COOSPAR Working Group On Cartographic
  rotational_element_desc~rotelementd~Coordinates and Rotational Elements because an unambiguous
  rotational_element_desc~rotelementd~definition of a planet's coordinate system requires these
  rotational_element_desc~rotelementd~values.
  row_bytes~rowbytes~The row_bytes element represents the number of bytes in
  row_bytes~rowbytes~each data object row.
  row_bytes~rowbytes~Note:  In the PDS, in labels for tables, the value of
  row_bytes~rowbytes~row_bytes includes terminators, separators, and delimiters unless
  row_bytes~rowbytes~spares are used.  For spares at the beginning of a row, the
  row_bytes~rowbytes~keyword row_prefix_bytes may be used.  For spares at the end
  row_bytes~rowbytes~of a row, row_suffix_bytes may be used.  See the Standards
  row_bytes~rowbytes~Reference, TABLE object for more information.
  row_prefix_bytes~rowpfxbytes~The row_prefix_bytes element indicates the number of bytes
  row_prefix_bytes~rowpfxbytes~prior to the start of the data content of each row of a
  row_prefix_bytes~rowpfxbytes~table. The value must represent an integral number of
  row_prefix_bytes~rowpfxbytes~bytes.
  row_prefix_structure~rowpfxstruc~The row_prefix_structure element indicates a pointer to a
  row_prefix_structure~rowpfxstruc~file that defines the structure of the row prefix bytes.
  row_prefix_structure~rowpfxstruc~See also:  file_name
  row_prefix_structure~rowpfxstruc~Note:  In the PDS this data element is obsolete.  It is
  row_prefix_structure~rowpfxstruc~kept in the data dictionary for historical purposes to allow
  row_prefix_structure~rowpfxstruc~data validation tools to function.  According to current
  row_prefix_structure~rowpfxstruc~standards, the structures of prefix and suffix data are
  row_prefix_structure~rowpfxstruc~illustrated through the use of the table object.
  rows~rows~The rows element represents the number of rows in a data
  rows~rows~object.
  rows~rows~Note:  In PDS, the term 'rows' is synonymous with
  rows~rows~'records'.  In PDS attached labels, the number of rows is
  rows~rows~equivalent to the number of file_records minus the number
  rows~rows~of label_records, as indicated in the file_object
  rows~rows~definition.
  row_suffix_bytes~rowsfxbytes~The row_suffix_bytes element indicates the number of bytes
  row_suffix_bytes~rowsfxbytes~following the data at the end of each row. The value must
  row_suffix_bytes~rowsfxbytes~be an integral number of bytes.
  row_suffix_structure~rowsfxstruc~The row_suffix_structure element indicates a pointer to a
  row_suffix_structure~rowsfxstruc~file that defines the structure of the ROW_SUFFIX_BYTES.
  row_suffix_structure~rowsfxstruc~See also: file_name
  row_suffix_structure~rowsfxstruc~Note:  In the PDS this data element is obsolete.  It is kept
  row_suffix_structure~rowsfxstruc~in the data dictionary for historical purposes to allow
  row_suffix_structure~rowsfxstruc~data validation tools to function.  According to current
  row_suffix_structure~rowsfxstruc~standards, the structures of prefix and suffix data are
  row_suffix_structure~rowsfxstruc~illustrated through the use of the table object.
  research_topic_desc~rschtopicd~The research_topic_desc element describes the topic of
  research_topic_desc~rschtopicd~scientific research identified by the research_topic_name
  research_topic_desc~rschtopicd~element.
  research_topic_name~rschtopicnm~The research_topic_name element provides the name of a topic
  research_topic_name~rschtopicnm~of scientific research.
  sample_bit_mask~sampbitmask~The sample_bit_mask element identifies the active bits in a
  sample_bit_mask~sampbitmask~sample.
  sample_bit_mask~sampbitmask~Note:  In the PDS, the domain of sample_bit_mask is
  sample_bit_mask~sampbitmask~dependent upon the currently-described value in the
  sample_bit_mask~sampbitmask~sample_bits element and only applies to integer values.
  sample_bit_mask~sampbitmask~For an 8-bit sample where all bits are active the
  sample_bit_mask~sampbitmask~sample_bit_mask would be 2#11111111#.
  sample_bits~sampbits~The sample_bits element indicates the stored number of
  sample_bits~sampbits~bits, or units of binary information, contained in a
  sample_bits~sampbits~line_sample value.
  sampling_desc~sampd~The sampling_desc element describes how instrument
  sampling_desc~sampd~parameters are sampled within an instrument or a section of
  sampling_desc~sampd~an instrument.  Generally, this includes information on the
  sampling_desc~sampd~timing of samples and how they are taken as a function of
  sampling_desc~sampd~energy, frequency, wavelength, position, etc.
  sample_display_direction~sampdspdir~The SAMPLE_DISPLAY_DIRECTION element is the preferred
  sample_display_direction~sampdspdir~orientation of samples within a line for viewing on a display
  sample_display_direction~sampdspdir~device. The default is right, meaning samples are viewed from
  sample_display_direction~sampdspdir~left to right on the display. See also LINE_DISPLAY_DIRECTION.
  sample_display_direction~sampdspdir~NULL
  sample_display_direction~sampdspdir~Note:  The image rotation elements such as TWIST_ANGLE,
  sample_display_direction~sampdspdir~CELESTIAL_NORTH_CLOCK_ANGLE, and BODY_POLE_CLOCK_ANGLE are all defined
  sample_display_direction~sampdspdir~under the assumption that the image is displayed in its preferred
  sample_display_direction~sampdspdir~orientation.
  sampling_factor~sampfact~The sampling_factor element provides the value N, where
  sampling_factor~sampfact~every Nth data point was kept from the original data set by
  sampling_factor~sampfact~selection, averaging, or taking the median.
  sampling_factor~sampfact~Note:  When applied to an image object, the single value
  sampling_factor~sampfact~represented in sampling_factor applies to both the lines
  sampling_factor~sampfact~and the samples.  When applied to a table object, the value
  sampling_factor~sampfact~applies only to the rows.
  sample_first_pixel~sampfirstpix~The sample_first_pixel element provides the sample index
  sample_first_pixel~sampfirstpix~for the first pixel that was physically recorded at the
  sample_first_pixel~sampfirstpix~beginning of the image array.
  sample_first_pixel~sampfirstpix~Note:  In the PDS, for a fuller explanation on
  sample_first_pixel~sampfirstpix~the use of this data element in the Image Map Projection
  sample_first_pixel~sampfirstpix~Object, please refer to the PDS Standards Reference.
  sample_last_pixel~samplastpix~The sample_last_pixel element provides the sample index for
  sample_last_pixel~samplastpix~the last pixel that was physically recorded at the end of
  sample_last_pixel~samplastpix~the image array.
  sample_last_pixel~samplastpix~Note:  In the PDS, for a fuller explanation on the
  sample_last_pixel~samplastpix~use of this data element in the Image Map Projection
  sample_last_pixel~samplastpix~Object, please refer to the PDS Standards Reference.
  sample_type~sampletype~The sample_type element indicates the data storage
  sample_type~sampletype~representation of sample value.
  sampling_parameter_interval~sampparmiv~The sampling_parameter_interval element identifies the
  sampling_parameter_interval~sampparmiv~spacing of points at which data are sampled and at which a
  sampling_parameter_interval~sampparmiv~value for an instrument or dataset parameter is available.
  sampling_parameter_interval~sampparmiv~This sampling interval can be either the original (raw)
  sampling_parameter_interval~sampparmiv~sampling or the result of some resampling process.
  sampling_parameter_interval~sampparmiv~For example, in 48-second magnetometer data the sampling
  sampling_parameter_interval~sampparmiv~interval is 48.
  sampling_parameter_interval~sampparmiv~The sampling parameter (time, in the example) is identified
  sampling_parameter_interval~sampparmiv~by the sampling_parameter_name element.
  sampling_parameter_name~sampparmname~The sampling_parameter_name element provides the name of
  sampling_parameter_name~sampparmname~the parameter which determines the sampling interval of a
  sampling_parameter_name~sampparmname~particular instrument or dataset parameter.
  sampling_parameter_name~sampparmname~For example, magnetic field intensity is sampled in time
  sampling_parameter_name~sampparmname~increments, and a spectrum is sampled in wavelength or
  sampling_parameter_name~sampparmname~frequency.
  sampling_parameter_resolution~sampparmres~The sampling_parameter_resolution element identifies the
  sampling_parameter_resolution~sampparmres~resolution along the sampling parameter axis.
  sampling_parameter_resolution~sampparmres~For example, spectral data may be sampled every 0.0005 cm
  sampling_parameter_resolution~sampparmres~in wavelength, but the smallest resolvable width of a
  sampling_parameter_resolution~sampparmres~feature could be 0.001 cm.  In this example, the sampling
  sampling_parameter_resolution~sampparmres~parameter resolution would be 0.001.
  sampling_parameter_resolution~sampparmres~Note that the unit element identifies the unit of measure
  sampling_parameter_resolution~sampparmres~of the sampling parameter resolution.
  sampling_parameter_unit~sampparmunit~The sampling_parameter_unit element specifies the unit of
  sampling_parameter_unit~sampparmunit~measure of associated data sampling parameters.
  sample_projection_offset~sampprojoff~The sample_projection_offset element provides the sample
  sample_projection_offset~sampprojoff~offset value of the map projection origin position from
  sample_projection_offset~sampprojoff~line and sample 1,1 (line and sample 1,1 is considered the
  sample_projection_offset~sampprojoff~upper left corner of the digital array).  Note that the
  sample_projection_offset~sampprojoff~positive direction is to the right and down.
  scaled_image_height~scaleimageht~The scaled_image_height element provides the height on the
  scaled_image_height~scaleimageht~target surface of the projection of an image onto the
  scaled_image_height~scaleimageht~surface.
  scaled_image_height~scaleimageht~This is the distance on the surface between intercept
  scaled_image_height~scaleimageht~points 2 (upper middle) and 8 (lower middle).
  scaled_image_width~scaleimagewd~The scaled_image_width element provides the width on the
  scaled_image_width~scaleimagewd~target surface of the projection of an image onto the
  scaled_image_width~scaleimagewd~surface.
  scaled_image_width~scaleimagewd~This is the distance on the surface between intercept
  scaled_image_width~scaleimagewd~points 4 (middle left) and 6 (middle right).
  scaled_pixel_height~scalepixht~The scaled_pixel_height element provides the scaled height
  scaled_pixel_height~scalepixht~of a pixel at a given reticle point within an image.
  scaled_pixel_height~scalepixht~Scaled pixel height is defined as the height on the surface
  scaled_pixel_height~scalepixht~of the target of the projection of a pixel onto the surface.
  scaled_pixel_width~scalepixwd~The scaled_pixel_width element provides the scaled width
  scaled_pixel_width~scalepixwd~of a pixel at a given reticle point within an image.
  scaled_pixel_width~scalepixwd~Scaled pixel width is defined as the width on the surface
  scaled_pixel_width~scalepixwd~of the target of the projection of a pixel onto the surface.
  scaling_factor~scalingfact~The scaling factor element provides the constant value by
  scaling_factor~scalingfact~which the stored value is multiplied. See also: offset.
  scaling_factor~scalingfact~Note:  Expressed as an equation: true value = offset value
  scaling_factor~scalingfact~+ (scaling factor x stored value).
  scaling_factor~scalingfact~In PDS Magellan altimetry and radiometry labels, the
  scaling_factor~scalingfact~scaling_factor data element is defined as the value of
  scaling_factor~scalingfact~the conversion factor for the best_non_range_sharp_model_tpt
  scaling_factor~scalingfact~and the non_range_sharp_echo_prof element that multiplies
  scaling_factor~scalingfact~the integer array elements of the
  scaling_factor~scalingfact~best_non_range_sharp_model_tpt and the
  scaling_factor~scalingfact~non_range_sharp_echo_prof to yield their physical values,
  scaling_factor~scalingfact~expressed as equivalent radar cross-sections in units of
  scaling_factor~scalingfact~km**2.
  spacecraft_altitude~scalt~The spacecraft_altitude element provides the distance from the space-
  spacecraft_altitude~scalt~craft to a reference surface of the target body measured normal to that
  spacecraft_altitude~scalt~surface.
  scan_mode_id~scanmodeid~The scan_mode_id element identifies one of several internal rates for
  scan_mode_id~scanmodeid~data acquisition by an instrument.
  scan_rate~scanrate~SCAN_RATE is the measured data rate at which an instrument scanned an
  scan_rate~scanrate~object while acquiring a data frame.
  spacecraft_clock_cnt_partition~scclockpart~The spacecraft_clock_cnt_partition element indicates the clock
  spacecraft_clock_cnt_partition~scclockpart~partition active for the SPACECRAFT_CLOCK_START_COUNT and
  spacecraft_clock_cnt_partition~scclockpart~SPACECRAFT_CLOCK_STOP_COUNT elements.
  spacecraft_desc~scd~The spacecraft_desc element describes the
  spacecraft_desc~scd~characteristics of a particular spacecraft.  This
  spacecraft_desc~scd~description addresses the complement of instruments
  spacecraft_desc~scd~carried, the onboard communications and data processing
  spacecraft_desc~scd~equipment, the method of stabilization, the source of power
  spacecraft_desc~scd~and the capabilities or limitations of the spacecraft
  spacecraft_desc~scd~design which are related to data-taking activities.  The
  spacecraft_desc~scd~description may be a synopsis of available mission
  spacecraft_desc~scd~documentation.
  scet_stop_time~scetstoptime~The scet_stop_time element is defined as an alias for
  scet_stop_time~scetstoptime~stop_time for Magellan mission operations files only.
  scet_start_time~scetstrttime~The scet_start_time element is defined as an alias for
  scet_start_time~scetstrttime~start_time for Magellan mission operations files in AMMOS.
  spacecraft_id~scid~The spacecraft_id element provides a synonym or
  spacecraft_id~scid~mnemonic for the name of a spacecraft which is uniquely
  spacecraft_id~scid~associable with the spacecraft name.
  spacecraft_id~scid~Note:  Within AMMOS only, this element is also an alias for
  spacecraft_id~scid~dsn_spacecraft_num.  This interpretation is not portable to
  spacecraft_id~scid~the PDS.
  scientist_funding_id~scifundid~The scientist_funding_id is the NASA code which supplies
  scientist_funding_id~scifundid~funding to the scientist.
  scientific_objectives_summary~sciobjsmy~The scientific_objectives_summary element explains the
  scientific_objectives_summary~sciobjsmy~science data_gathering purposes for a particular type of
  scientific_objectives_summary~sciobjsmy~observation, for a particular observation sequence or for
  scientific_objectives_summary~sciobjsmy~which an instrument was designed.
  spacecraft_clock_stop_count~sclkstopcnt~The spacecraft_clock_stop_count element provides the value
  spacecraft_clock_stop_count~sclkstopcnt~of the spacecraft clock  at the end of a time period of
  spacecraft_clock_stop_count~sclkstopcnt~interest.
  sclk_stop_value~sclkstopval~The sclk_stop_value element is an alias for spacecraft_
  sclk_stop_value~sclkstopval~clock_stop_count which is used only in AMMOS-Magellan
  sclk_stop_value~sclkstopval~mission operations files.
  spacecraft_clock_start_count~sclkstrtcnt~The spacecraft_clock_start_count element provides the value of the
  spacecraft_clock_start_count~sclkstrtcnt~spacecraft clock at the beginning of a time period of interest.
  spacecraft_clock_start_count~sclkstrtcnt~Note:  In the PDS, sclk_start_counts have been represented
  spacecraft_clock_start_count~sclkstrtcnt~in the following ways:
  spacecraft_clock_start_count~sclkstrtcnt~Voyager - Flight Data Subsystem (FDS) clock count
  spacecraft_clock_start_count~sclkstrtcnt~          (floating point 7.2)
  spacecraft_clock_start_count~sclkstrtcnt~Mariner 9 - Data Automation Subsystem,
  spacecraft_clock_start_count~sclkstrtcnt~Mariner 10 - FDS - spacecraft_clock
  sclk_start_value~sclkstrtval~The sclk_start_value element is an alias for spacecraft_
  sclk_start_value~sclkstrtval~clock_start_count which is used only by AMMOS-Magellan
  sclk_start_value~sclkstrtval~mission operations data files.
  spacecraft_name~scname~The spacecraft_name element provides the full, unabbreviated
  spacecraft_name~scname~name of a spacecraft.  See also: spacecraft_id,
  spacecraft_name~scname~instrument_host_id.
  spacecraft_operating_mode_id~scopermodeid~The spacecraft_operating_mode_id element identifies a
  spacecraft_operating_mode_id~scopermodeid~particular configuration in which the spacecraft takes and
  spacecraft_operating_mode_id~scopermodeid~returns data.
  spacecraft_operations_type~scopertype~The spacecraft_operation_type element
  spacecraft_operations_type~scopertype~provides the type of mode of operation of a spacecraft.
  spacecraft_operations_type~scopertype~Example values:  SUN-SYNCHRONOUS, GEOSTATIONARY, LANDER,
  spacecraft_operations_type~scopertype~ROVER, FLYBY.
  spacecraft_solar_distance~scsolardist~The spacecraft_solar_distance element provides the distance
  spacecraft_solar_distance~scsolardist~from the spacecraft to the center of the sun.  See also:
  spacecraft_solar_distance~scsolardist~solar_distance.
  sc_sun_position_vector~scsunposvect~The sc_sun_position_vector element indicates the x-, y-,
  sc_sun_position_vector~scsunposvect~and z- components of the position vector from observer to
  sc_sun_position_vector~scsunposvect~sun, center expressed in J2000 coordinates, and corrected
  sc_sun_position_vector~scsunposvect~for light time and stellar aberration, evaluated at epoch
  sc_sun_position_vector~scsunposvect~at which image was taken.
  sc_sun_velocity_vector~scsunvelvect~The sc_sun_velocity_vector element indicates the x-, y-,
  sc_sun_velocity_vector~scsunvelvect~and z- components of the velocity vector of sun relative to
  sc_sun_velocity_vector~scsunvelvect~observer, expressed in J2000 coordinates, and corrected for
  sc_sun_velocity_vector~scsunvelvect~light time, evaluated at epoch at which image was taken.
  sc_target_position_vector~sctgposvect~The sc_target_position_vector element indicates the x-, y-,
  sc_target_position_vector~sctgposvect~z- components of the position vector from observer to
  sc_target_position_vector~sctgposvect~target center expressed in J2000 coordinates, and
  sc_target_position_vector~sctgposvect~corrected for light time and stellar aberration, evaluated
  sc_target_position_vector~sctgposvect~at epoch at which image was taken.
  sc_target_velocity_vector~sctgvelvect~The sc_target_velocity_vector element indicates the x-, y-,
  sc_target_velocity_vector~sctgvelvect~z- components of the velocity vector of target relative to
  sc_target_velocity_vector~sctgvelvect~observer, expressed in J2000 coordinates, and corrected for
  sc_target_velocity_vector~sctgvelvect~light time, evaluated at epoch at which image was taken.
  second_standard_parallel~secstdparll~Please refer to the definition for first_standard_parallel
  second_standard_parallel~secstdparll~element to see how second_standard_parallel is defined.
  section_id~sectid~The section_id element provides a unique identifier for a
  section_id~sectid~section of an instrument.  An instrument section is a
  section_id~sectid~logical view of an instrument's operating functions, and is
  section_id~sectid~distinct from the instrument's physical composition.
  section_id~sectid~Essentially, instrument sections are a device to describe
  section_id~sectid~the instrument's functioning in terms of a set of 'black
  section_id~sectid~boxes', which are themselves described parametrically by the
  section_id~sectid~data which are produced.  Various operational parts of the
  section_id~sectid~instrument, such as detectors, filters, and electronics, are
  section_id~sectid~considered to participate by providing data from a section,
  section_id~sectid~but have no direct physical relationship with the section,
  section_id~sectid~since the section is not a physical object.  Instrument
  section_id~sectid~modes consist of sets of sections, and the physical
  section_id~sectid~implementation of a mode is the union of those physical
  section_id~sectid~units which are processing data for each section
  section_id~sectid~participating in the mode.
  sef_creation_time~sefcreatntm~This element is unique to the AMMOS-MGN KEY_TIMES data file.
  sef_creation_time~sefcreatntm~It defines the time of creation of the source sequence file.
  selection_query_desc~selcqueryd~The selection_query_desc element provides a query
  selection_query_desc~selcqueryd~statement, in Standard Query Language (SQL) or another
  selection_query_desc~selcqueryd~query language, which constrains the set of items
  selection_query_desc~selcqueryd~requested in an order.
  solar_elongation_sigma~selongsigma~ The standard deviation of the solar elongation determined
  solar_elongation_sigma~selongsigma~from variations in values from the spacecraft sun-sensor.
  sensitivity_desc~sensd~The sensitivity_desc element provides a textual
  sensitivity_desc~sensd~description of the minimum response threshold of a
  sensitivity_desc~sensd~detector.
  seq_id~seqid~The seq_id element provides an identification of the
  seq_id~seqid~spacecraft sequence associated with the given product.
  sequence_number~seqnum~The sequence_number element indicates a number designating
  sequence_number~seqnum~the place occupied by an item in an ordered sequence.
  sequence_samples~seqsamps~The sequence_samples element specifies the number of
  sequence_samples~seqsamps~samples in a given observation sequence.
  sequence_table_id~seqtableid~The sequence_table_id element provides an unique identifier
  sequence_table_id~seqtableid~for the sequence table that was used for a set of
  sequence_table_id~seqtableid~observations.  The sequence table provides the image
  sequence_table_id~seqtableid~acquistion sequences that specify the camera and filter
  sequence_table_id~seqtableid~image sequencing.  It indicates the order in which cameras
  sequence_table_id~seqtableid~are shuttered and the order for which filters are used.
  sequence_title~seqtitle~The sequence_title element provides the title assigned to a
  sequence_title~seqtitle~particular observation sequence during planning or data
  sequence_title~seqtitle~processing.
  sfdu_format_id~sfdufmtid~The sfdu_format_id element provides the 12-character
  sfdu_format_id~sfdufmtid~Standard Format Data Unit (SFDU) identification for a
  sfdu_format_id~sfdufmtid~particular set of data.
  shutter_offset_file_name~shtrofstflnm~The shutter_offset_file_name element identifies the file
  shutter_offset_file_name~shtrofstflnm~that contains the corrections for discrepancies between
  shutter_offset_file_name~shtrofstflnm~commanded and actual shutter times.  Because the shutter
  shutter_offset_file_name~shtrofstflnm~blades travel in a vertical direction, offsets in actual
  shutter_offset_file_name~shtrofstflnm~exposure are a function of image line number.
  shutter_mode_id~shutmodeid~The shutter_mode_id element identifies the state of an
  shutter_mode_id~shutmodeid~imaging instrument's shutter during image acquisition. Note:
  shutter_mode_id~shutmodeid~the instrument shutter mode affects the radiometric
  shutter_mode_id~shutmodeid~properties of the camera. Example values: (VOYAGER) NAONLY -
  shutter_mode_id~shutmodeid~narrow angle camera shuttered only, WAONLY - wide angle
  shutter_mode_id~shutmodeid~camera shuttered only, BOTSIM - both cameras shuttered
  shutter_mode_id~shutmodeid~simultaneously, BSIMAN - BOTSIM mode followed by NAONLY,
  shutter_mode_id~shutmodeid~BODARK - shutter remained closed for narrow and wide angle
  shutter_mode_id~shutmodeid~camera, NADARK - narrow angle read out without shuttering,
  shutter_mode_id~shutmodeid~WADARK - wide angle read out without shuttering.
  sidereal_rotation_period~sidrotper~The sidereal_rotation_period element indicates the time required for an
  sidereal_rotation_period~sidrotper~object to complete one full rotation about its primary axis with respect
  sidereal_rotation_period~sidrotper~to the stars.  See rotation_direction.
  site_id~siteid~Short identifier for each CMD site.  See CMD Subsystem doc.
  site_name~sitename~The site_name element is used to describe the spacecraft
  site_name~sitename~commanding site for AMMOS CMD subsystem.  Values include
  site_name~sitename~MASTER, MCCC, SEQTRAN, GSOC.
  slant_distance~slantdist~The slant_distance element provides a measure of the distance from an
  slant_distance~slantdist~observing position (e.g., a spacecraft) to a point on a target body.
  slant_distance~slantdist~If not specified otherwise, the target point is assumed to be at the
  slant_distance~slantdist~center of the instrument field of view.
  slope_file_name~slopfilename~The SLOPE_FILE_NAME element provides the file containing
  slope_file_name~slopfilename~corrections for variances in responsivity (shading) across
  slope_file_name~slopfilename~the field-of-view of an imaging sensor.
  smear_azimuth~smearaz~The smear_azimuth element indicates the direction in which
  smear_azimuth~smearaz~an image was smeared.  The values of this angle increment in
  smear_azimuth~smearaz~a clockwise direction from a horizontal reference line.
  smear_magnitude~smearmag~The smear_magnitude element indicates how far an image was
  smear_magnitude~smearmag~smeared during an exposure.
  scaled_noise_level~snoiselevel~ The scaled_noise_level element provides an indicator of
  scaled_noise_level~snoiselevel~the dynamic range within a ring occultation data set.  It
  scaled_noise_level~snoiselevel~specifies the ratio of the RMS noise level in the data to
  scaled_noise_level~snoiselevel~the amplitude difference between an unobstructed signal
  scaled_noise_level~snoiselevel~(corresponding to opacity = 0) and a completely obstructed
  scaled_noise_level~snoiselevel~signal (corresponding to infinite opacity):\n  (RMS noise)
  scaled_noise_level~snoiselevel~/ (unobstructed signal - fully obstructed signal).\n  The
  scaled_noise_level~snoiselevel~value is computed assuming the data has been re-processed
  scaled_noise_level~snoiselevel~to the radial resolution specified by the
  scaled_noise_level~snoiselevel~reference_radial_resolution element.
  solar_elongation~solarelong~ The angle between the line of sight of observation and the
  solar_elongation~solarelong~direction of the Sun.\n
  solar_elongation~solarelong~Note:  For IRAS:  The line of
  solar_elongation~solarelong~sight of observation is the boresight of the telescope as
  solar_elongation~solarelong~measured by the satellite sun sensor.
  solar_distance~soldist~The solar_distance element provides the distance from the
  solar_distance~soldist~center of the sun to the center of a target body.
  solar_latitude~sollat~The solar_latitude element provides the subsolar latitude
  solar_latitude~sollat~value.
  solar_latitude~sollat~Subsolar latitude is defined as the latitude of the point
  solar_latitude~sollat~on the target body surface that would be intersected by a
  solar_latitude~sollat~straight line from the center of the sun to the center of
  solar_latitude~sollat~the target body.
  solar_longitude~sollon~The solar_longitude element provides the value of the angle
  solar_longitude~sollon~between the body_Sun line at the time of interest and the
  solar_longitude~sollon~body_Sun line at the vernal equinox.
  solar_longitude~sollon~This provides a measure of season on a target body, with
  solar_longitude~sollon~values of 0 to 90 degrees representing northern spring, 90
  solar_longitude~sollon~to 180 degrees representing northern summer, 180 to 270
  solar_longitude~sollon~degrees representing northern autumn and 270 to 360 degrees
  solar_longitude~sollon~representing northern winter.
  solar_longitude~sollon~For IRAS:  the geocentric ecliptic longitude (B1950)
  solar_longitude~sollon~of the Sun at the start of a scan.
  source_data_set_id~sourcedsid~The source_data_set_id element identifies a set
  source_data_set_id~sourcedsid~of data which was used to produce the subject data set,
  source_data_set_id~sourcedsid~data product or SPICE kernel.
  source_lines~sourcelines~The source_lines element indicates the total number of
  source_lines~sourcelines~lines in the image from which a rectangular sub-image has
  source_lines~sourcelines~been derived.
  source_lines~sourcelines~Note:  If source_lines appears in the image
  source_lines~sourcelines~object, it should be greater than the value of lines, to
  source_lines~sourcelines~indicate that the image described by lines and line_samples
  source_lines~sourcelines~is a sub-image of the original (source) image.
  source_name~sourcename~The source_name element supplies the name of the proponent
  source_name~sourcename~of the data element or object. (For example, PDS
  source_name~sourcename~CN/J.S.Hughes)
  source_product_id~sourceprodid~The source_product_id data element identifies a product used
  source_product_id~sourceprodid~as input to create a new product.  The source_product_id may
  source_product_id~sourceprodid~be based on a file name.  See also: product_id.
  specialty_desc~spcld~The specialty_desc element describes an individual's area
  specialty_desc~spcld~of specialization during his or her association with a
  specialty_desc~spcld~particular institution.
  specialty_desc~spcld~Note that `specialty' is a more general characterization
  specialty_desc~spcld~of the individual's activities than is `role.'  See
  specialty_desc~spcld~role_desc.
  special_instruction_id_number~specidnum~The special_instruction_id_number element is a unique key
  special_instruction_id_number~specidnum~that is used to identify a particular set of special
  special_instruction_id_number~specidnum~instructions in a user's order.
  spectrum_integrated_radiance~specintgrdnc~The spectrum_integrated_radiance element provides the
  spectrum_integrated_radiance~specintgrdnc~radiance value derived from integration across an entire
  spectrum_integrated_radiance~specintgrdnc~spectrum.
  spectrum_number~specnum~The spectrum_number element provides the number which
  spectrum_number~specnum~identifies a particular spectrum.
  spectrum_samples~specsamps~The spectrum_samples element provides the number of samples
  spectrum_samples~specsamps~which form a given spectrum.
  spice_file_name~spicefilenm~The spice_file_name element provides the names of the SPICE files used
  spice_file_name~spicefilenm~in processing the data. For Galileo, the SPICE files are used to
  spice_file_name~spicefilenm~determine navigation and lighting information.
  sql_format~sqlfmt~The sql_format element supplies the SQL data type used when
  sql_format~sqlfmt~the data element is declared as a column in a table in a
  sql_format~sqlfmt~relational data base management system.
  source_file_name~srcfilename~The source_file_name element provides the name of a specific
  source_file_name~srcfilename~file that resides within the same data directory and
  source_file_name~srcfilename~contributes data to a given product.  See also:
  source_file_name~srcfilename~source_product_id.
  source_line_samples~srclinesamps~The source_line_samples element indicates the total number
  source_line_samples~srclinesamps~of samples in the image from which a rectangular sub-image
  source_line_samples~srclinesamps~has been derived.
  source_line_samples~srclinesamps~Note:  In the PDS, if source_line_samples appears in
  source_line_samples~srclinesamps~the image object, it should be greater than the value of
  source_line_samples~srclinesamps~line_samples, to indicate that the image described by lines
  source_line_samples~srclinesamps~and line_samples is a sub-image of the original (source)
  source_line_samples~srclinesamps~image.
  source_sample_bits~srcsampbits~The source_sample_bits element indicates the number of
  source_sample_bits~srcsampbits~bits, or units of binary information, that make up a sample
  source_sample_bits~srcsampbits~value in the source file used to produce a sub-image.
  surface_emissivity~srfemissivty~ The surface_emissivity element provides the value of
  surface_emissivity~srfemissivty~surface microwave emissivity, calculated by dividing
  surface_emissivity~srfemissivty~(surface_emission_temperature -
  surface_emissivity~srfemissivty~assumed_warm_sky_temperature) by
  surface_emissivity~srfemissivty~(physical_surface_temperature -
  surface_emissivity~srfemissivty~assumed_warm_sky_temperature).
  star_description~stardesc~ The star_description element describes the properties of a
  star_description~stardesc~particular star. Information provided may include, for
  star_description~stardesc~example, the star's type, V and K magnitudes, catalog
  star_description~stardesc~references, alternative names, etc.
  star_diameter~stardiameter~ The star_diameter element indicates the angular diameter
  star_diameter~stardiameter~of a star.
  star_name~starname~ The star_name element provides the identifying name of
  star_name~starname~star, including the catalog name if necessary.  Examples
  star_name~starname~include 'sigma Sgr' and 'SAO 123456' (for star number
  star_name~starname~123456 in the Smithsonian Astrophysical Observatory
  star_name~starname~catalog).
  start_azimuth~startaz~The START_AZIMUTH is the angular distance from a fixed reference
  start_azimuth~startaz~position at which an image or observation starts.  Azimuth is measured
  start_azimuth~startaz~in a spherical coordinate system, in a plane normal to the principal
  start_azimuth~startaz~axis.  Azimuth values increase according to the right hand rule
  start_azimuth~startaz~relative to the positive direction of the principal axis of the
  start_azimuth~startaz~spherical coordinate system.
  start_bit~startbit~The start_bit element identifies the location of the first
  start_bit~startbit~bit of a bit field data object such as a BIT_COLUMN or BIT_
  start_bit~startbit~ELEMENT.  Bits are numbered from left to right, counting fro
  start_bit~startbit~1.  The start_bit value assumes that any necessary byte
  start_bit~startbit~re-ordering has already been performed.
  start_byte~startbyte~The start_byte element in a data object identifies the
  start_byte~startbyte~location of the first byte of the object, counting from 1.
  start_byte~startbyte~For nested objects, the start_byte value is relative to the
  start_byte~startbyte~start of the enclosing object.
  start_orbit_number~startorbnum~The start_orbit_number data element provides the the lowest
  start_orbit_number~startorbnum~revolution orbit number that contributed data to a given
  start_orbit_number~startorbnum~data product.
  star_window~starwindow~ The star_window element provides the location and size of up to 5 star
  star_window~starwindow~areas (number of image areas defined by STAR_WINDOW_COUNT) in an edited
  star_window~starwindow~Optical Navigation (OPNAV) image. The location and size of each image
  star_window~starwindow~area is defined by four numbers: starting line, starting sample, number
  star_window~starwindow~of lines, number of samples (the origin of the image coordinate system
  star_window~starwindow~is at line, sample=1,1 for the upper-left corner with samples
  star_window~starwindow~increasing to the right and lines increasing down). This element is
  star_window~starwindow~Galileo Solid State Imaging- specific.
  star_window_count~starwindwcnt~ Galileo Solid State Imaging-specific. The star_window_count element
  star_window_count~starwindwcnt~indicates the number of star areas, defined in the STAR WINDOW keyword,
  star_window_count~starwindwcnt~in an edited Optical Navigation (OPNAV) image.
  status_note~statusnote~The status_note element supplies a log of modifications
  status_note~statusnote~made to an element or object definition. The required entry
  status_note~statusnote~includes <Version_Id / Date / Author / Desc>. Example
  status_note~statusnote~format: \t 1.0  1990-03-28  DET  New Data_Element
  status_note~statusnote~Definition
  status_note~statusnote~The description can continue for several lines.
  status_type~statustype~The status_type element indicates one of a fixed number of
  status_type~statustype~statuses that can describe a particular data element or
  status_type~statustype~object.  Examples:  PENDING, APPROVED.
  standard_deviation~stddeviation~The standard_deviation element provides the standard
  standard_deviation~stddeviation~deviation of the DN values in the image array.
  standard_value_name~stdvalname~The standard_value_name element provides a value for a
  standard_value_name~stdvalname~particular data element.
  standard_value_set~stdvalset~The standard_value_set element supplies the list of
  standard_value_set~stdvalset~standard values that may be assigned to a data element. The
  standard_value_set~stdvalset~standard_value_set may be explicitly specified via this
  standard_value_set~stdvalset~data element or may be implicitly derived from
  standard_value_set~stdvalset~GENERAL_DATA_TYPE, VALID_MINIMUM and VALID_MAXIMUM data
  standard_value_set~stdvalset~elements.
  standard_value_set_desc~stdvalsetd~The standard_value_set_desc element is used to supply
  standard_value_set_desc~stdvalsetd~information about or descriptions of individual members of
  standard_value_set_desc~stdvalsetd~the standard value set.
  standard_value_type~stdvaltype~The standard_value_type element indicates the type of
  standard_value_type~stdvaltype~standard value which exists for a PDS data element.  Example
  standard_value_type~stdvaltype~values: static - values for the data element exist in a
  standard_value_type~stdvaltype~defined and fixed set of standard values, dynamic -
  standard_value_type~stdvaltype~values for the data element must either exist in a set of
  standard_value_type~stdvaltype~defined standard values or be approved by peer review for
  standard_value_type~stdvaltype~inclusion to the set of standard values, suggest -
  standard_value_type~stdvaltype~values for the data element must exist in a set of defined
  standard_value_type~stdvaltype~standard values or may be added to the set of standard
  standard_value_type~stdvaltype~values with no requirement for peer review, range -
  standard_value_type~stdvaltype~values for the data element must fall within a default range
  standard_value_type~stdvaltype~specified with the minimum  and maximum elements,
  standard_value_type~stdvaltype~formation - values for the data element must conform to a
  standard_value_type~stdvaltype~formation rule.
  stop_azimuth~stopaz~The STOP_AZIMUTH is the angular distance from a fixed reference
  stop_azimuth~stopaz~position at which an image or observation stops.  Azimuth is measured
  stop_azimuth~stopaz~in a spherical coordinate system, in a plane normal to the principal
  stop_azimuth~stopaz~axis.  Azimuth values increase according to the right hand rule
  stop_azimuth~stopaz~relative to the positive direction of the principal axis of the
  stop_azimuth~stopaz~spherical coordinate system.
  stop_delimiting_parameter~stopdelimprm~The stop_delimiting_parameter element provides the ending
  stop_delimiting_parameter~stopdelimprm~parameter value which, together with the
  stop_delimiting_parameter~stopdelimprm~start_delimiting_parameter value, delimits a subset of
  stop_delimiting_parameter~stopdelimprm~data.
  stop_orbit_number~stoporbnum~The stop_orbit_number data element provides the the highest
  stop_orbit_number~stoporbnum~revolution orbit number that contributed data to a given
  stop_orbit_number~stoporbnum~data product.
  stop_sample_number~stopsampnum~The stop_sample_number element identifies the highest of
  stop_sample_number~stopsampnum~the sample numbers which define the orbit sequence portion
  stop_sample_number~stopsampnum~located within a given bin.
  stop_sequence_number~stopseqnum~The stop_sequence_number element provides the number of the
  stop_sequence_number~stopseqnum~last sequence in a revolution.  See sequence_number.
  stop_time~stoptime~The stop_time element provides the date and time of the end
  stop_time~stoptime~of an observation or event (whether it be a spacecraft,
  stop_time~stoptime~ground-based, or system event) in UTC system format.
  stop_time~stoptime~Formation rule: YYYY-MM-DDThh:mm:ss[.fff]
  stop_time_from_closest_aprch~stoptmclsapr~The stop_time_from_closest_approach element provides the
  stop_time_from_closest_aprch~stoptmclsapr~time from spacecraft periapsis at the end of a sequence.
  stop_time_from_closest_aprch~stoptmclsapr~See time_from_closest_approach.
  storage_level_id~storlvlid~The storage_level_id element identifies a particular storage
  storage_level_id~storlvlid~level.
  storage_level_id~storlvlid~For example, if the complete pathname for a stored data file
  storage_level_id~storlvlid~is 'JPLPDS::DISK$USER1:[JJEANS.UNIVERSE]DESCRPTR.LIS' then
  storage_level_id~storlvlid~the storage_level_id element value will be one
  storage_level_id~storlvlid~of the following:  JPLPDS, DISK$USER1, JJEANS, UNIVERSE,
  storage_level_id~storlvlid~DESCRPTR.LIS.
  storage_level_number~storlvlnum~The storage_level_number element describes the position of a
  storage_level_number~storlvlnum~given storage level within the overall storage hierarchy of
  storage_level_number~storlvlnum~an entire data set, data product, or SPICE kernel.
  storage_level_number~storlvlnum~As many storage levels are documented as are necessary to
  storage_level_number~storlvlnum~identify the data.  Level 0 indicates the highest storage
  storage_level_number~storlvlnum~level, which successively higher level numbers indicate
  storage_level_number~storlvlnum~successively lower levels in the storage hierarchy.
  storage_level_type~storlvltype~The storage_level_type element identifies the type of
  storage_level_type~storlvltype~storage structure to which a given storage_level_number
  storage_level_type~storlvltype~refers.
  storage_level_type~storlvltype~Example values: DATABASE, PHOTOGRAPHIC FRAME NUMBER, TAPE
  storage_level_type~storlvltype~REEL NUMBER, VAX COMPUTER, VAX DIRECTORY, VAX FILE, VAX
  storage_level_type~storlvltype~SUBDIRECTORY.
  stretched_flag~stretchedflg~The stretched_flag element indicates whether a data object
  stretched_flag~stretchedflg~has been stretched using the minimum_stretch and
  stretched_flag~stretchedflg~maximum_stretch parameters.  A value of TRUE means that it
  stretched_flag~stretchedflg~has been stretched and a value of FALSE means it has not
  stretched_flag~stretchedflg~been stretched.
  stretch_maximum~stretchmax~The stretch_maximum element provides the sample value in a
  stretch_maximum~stretchmax~data object which should normally be mapped to the highest
  stretch_maximum~stretchmax~display value available on an output device for optimum
  stretch_maximum~stretchmax~viewing.  Sample values between stretch_minimum and
  stretch_maximum~stretchmax~stretch_maximum values are linearly interpolated over the
  stretch_maximum~stretchmax~dynamic range of the display device. If it is necessary to
  stretch_maximum~stretchmax~map the sample value to a value other than the highest
  stretch_maximum~stretchmax~display value (normally 255), the stretch_minimum is
  stretch_maximum~stretchmax~expressed as a sequence of values, where the first value
  stretch_maximum~stretchmax~represents the sample value in the data object and the
  stretch_maximum~stretchmax~second value represents the target output value to the
  stretch_maximum~stretchmax~display device.  For example:
  stretch_maximum~stretchmax~stretch_maximum = 120
  stretch_maximum~stretchmax~indicates that sample values greater than 120 should be
  stretch_maximum~stretchmax~mapped to 255 on the output device.
  stretch_maximum~stretchmax~stretch_minimum = (120,230)
  stretch_maximum~stretchmax~indicates that sample values greater than 120
  stretch_maximum~stretchmax~should be mapped to 230 on the output device.
  stretch_maximum~stretchmax~The STRETCHED_FLAG keyword indicates whether the stretch has
  stretch_maximum~stretchmax~already been applied to the data (stretched_flag = true) or
  stretch_maximum~stretchmax~whether it needs to be applied (stretched_flag = false).
  stretch_minimum~stretchmin~The stretch_minimum element provides the sample value in a
  stretch_minimum~stretchmin~data object which should normally be mapped to the highest
  stretch_minimum~stretchmin~display value available on an output device for optimum
  stretch_minimum~stretchmin~viewing.  Sample values between stretch_minimum and
  stretch_minimum~stretchmin~stretch_maximum values are linearly interpolated over the
  stretch_minimum~stretchmin~dynamic range of the display device. If it is necessary to
  stretch_minimum~stretchmin~map the sample value to a value other than the highest
  stretch_minimum~stretchmin~display value (normally 255), the stretch_minimum is
  stretch_minimum~stretchmin~expressed as a sequence of values, where the first value
  stretch_minimum~stretchmin~represents the sample value in the data object and the
  stretch_minimum~stretchmin~second value represents the target output value to the
  stretch_minimum~stretchmin~display device.  For example:
  stretch_minimum~stretchmin~stretch_maximum = 120
  stretch_minimum~stretchmin~indicates that sample values greater than 120 should be
  stretch_minimum~stretchmin~mapped to 255 on the output device.
  stretch_minimum~stretchmin~stretch_minimum = (120,230)
  stretch_minimum~stretchmin~indicates that sample values greater than 120
  stretch_minimum~stretchmin~should be mapped to 230 on the output device.
  stretch_minimum~stretchmin~The STRETCHED_FLAG keyword indicates whether the stretch has
  stretch_minimum~stretchmin~already been applied to the data (stretched_flag = true) or
  stretch_minimum~stretchmin~whether it needs to be applied (stretched_flag = false).
  start_delimiting_parameter~strtdelimprm~The start_delimiting_parameter element provides the
  start_delimiting_parameter~strtdelimprm~beginning parameter value which, together with the
  start_delimiting_parameter~strtdelimprm~stop_delimiting_parameter value, delimits a subset of data.
  start_julian_date~strtjuldate~The start_julian_date element provides the Julian date of
  start_julian_date~strtjuldate~the start of a time period of interest.  Julian date is
  start_julian_date~strtjuldate~defined as an integer count of days elapsed since noon,
  start_julian_date~strtjuldate~January 1, 4713 B.C.  Thus, the Julian date of noon January 1,
  start_julian_date~strtjuldate~1960 (A.D.) is 2436935.
  start_time_from_closest_aprch~strtmclsapr~The start_time_from_closest_approach element provides the
  start_time_from_closest_aprch~strtmclsapr~time from spacecraft periapsis at the beginning of a
  start_time_from_closest_aprch~strtmclsapr~sequence.  See time_from_closest_approach.
  start_page_number~strtpagenum~The start_page_number element identifies the beginning page
  start_page_number~strtpagenum~number of a reference document which appears (as an
  start_page_number~strtpagenum~article, for example) in a journal, report or other
  start_page_number~strtpagenum~published work.
  start_rescan_number~strtrscannum~The START_RESCAN_NUMBER is the scan line number at which the rescan
  start_rescan_number~strtrscannum~mode begins.  The rescan mode consists of scanning either vertically or
  start_rescan_number~strtrscannum~horizontally repeatedly at the same azimuth.
  start_sample_number~strtsampnum~The start_sample_number element identifies the lowest of
  start_sample_number~strtsampnum~the sample numbers which define the orbit sequence portion
  start_sample_number~strtsampnum~located within a given bin.
  start_sequence_number~strtseqnum~The start_sequence_number element provides the number of
  start_sequence_number~strtseqnum~the first sequence in a revolution.  See sequence_number.
  start_time~strttime~The start_time element provides the date and time of
  start_time~strttime~the beginning of an event or observation (whether it
  start_time~strttime~be a spacecraft, ground-based, or system event) in
  start_time~strttime~UTC system format.
  start_time~strttime~Formation rule: YYYY-MM-DDThh:mm:ss[.fff]
  start_time_base~strttimebase~The start_time_base element provides the elapsed time from
  start_time_base~strttimebase~the beginning of each frame to the beginning of a particular
  start_time_base~strttimebase~mode.
  satellite_time_from_clst_apr~sttmclstapr~The SATELLITE_TIME_FROM_CLST_APR element provides the time
  satellite_time_from_clst_apr~sttmclstapr~from closest approach to the nearest satellite.  This
  satellite_time_from_clst_apr~sttmclstapr~element can be represented with a negative value, (e.g.
  satellite_time_from_clst_apr~sttmclstapr~before the satellite encounter).  This element should not
  satellite_time_from_clst_apr~sttmclstapr~be confused with TIME_FROM_CLOSEST_APPROACH which is the
  satellite_time_from_clst_apr~sttmclstapr~from closest approach to the central body.
  sub_light_source_azimuth~sublitsrcaz~The sub_light_source_azimuth element provides the value of
  sub_light_source_azimuth~sublitsrcaz~the angle between the line from the center of an image to
  sub_light_source_azimuth~sublitsrcaz~the sub-light-source point and a horizontal reference line
  sub_light_source_azimuth~sublitsrcaz~(in the image plane) extending from the image center to the
  sub_light_source_azimuth~sublitsrcaz~middle right edge of the image.
  sub_light_source_latitude~sublitsrclat~The sub_light_source_latitude element provides the latitude
  sub_light_source_latitude~sublitsrclat~of the sub-light-source point.  The sub-light-source point
  sub_light_source_latitude~sublitsrclat~is the point on a body that lies under the light source.
  sub_light_source_longitude~sublitsrclon~The sub_light_source_longitude element provides the
  sub_light_source_longitude~sublitsrclon~longitude of the sub-light-source point.  The
  sub_light_source_longitude~sublitsrclon~sub-light-source point is the point on a body that lies
  sub_light_source_longitude~sublitsrclon~under the light source.
  sub_object_name~subobjname~The sub_object_name element provides the template object
  sub_object_name~subobjname~name for a child object name subordinate to a parent object
  sub_object_name~subobjname~name.  This object name is used by the catalog bulk loading
  sub_object_name~subobjname~software to establish a hierarchy between template objects.
  sub_object_name~subobjname~For full definitions of the terms object and sub-object,
  sub_object_name~subobjname~please refer to PDS standards documentation.
  sub_spacecraft_azimuth~subscaz~The sub_spacecraft_azimuth element provides the value of
  sub_spacecraft_azimuth~subscaz~the angle between the line from the center of an image to
  sub_spacecraft_azimuth~subscaz~the subspacecraft point and a horizontal reference line (in
  sub_spacecraft_azimuth~subscaz~the image plane) extending from the image center to the
  sub_spacecraft_azimuth~subscaz~middle right edge of the image.
  sub_spacecraft_azimuth~subscaz~The values of this angle increase in a clockwise direction.
  sub_spacecraft_latitude~subsclat~The sub_spacecraft_latitude element provides the latitude of
  sub_spacecraft_latitude~subsclat~the subspacecraft point.  The subspacecraft point is that
  sub_spacecraft_latitude~subsclat~point on a body which lies directly beneath the spacecraft.
  sub_spacecraft_line~subscline~The sub_spacecraft_line element is the image line containing the sub-
  sub_spacecraft_line~subscline~spacecraft point.  The subspacecraft point is that point on a body's
  sub_spacecraft_line~subscline~reference surface where a line from the spacecraft center to the body
  sub_spacecraft_line~subscline~center intersects the surface.
  sub_spacecraft_line_sample~subsclinesmp~The sub_spacecraft_line_sample element is the image sample coordinate
  sub_spacecraft_line_sample~subsclinesmp~containing the supspacecraft point.  The subspacecraft point is that
  sub_spacecraft_line_sample~subsclinesmp~point on a body's reference surface where a line from the spacecraft
  sub_spacecraft_line_sample~subsclinesmp~center to the body center intersects the surface.
  sub_spacecraft_longitude~subsclon~The sub_spacecraft_longitude element provides the longitude
  sub_spacecraft_longitude~subsclon~of the subspacecraft point.  The subspacecraft point is that
  sub_spacecraft_longitude~subsclon~point on a body's reference surface where a line from the spacecraft
  sub_spacecraft_longitude~subsclon~center to the body center intersects the surface.
  sub_spacecraft_longitude~subsclon~ 
  sub_spacecraft_longitude~subsclon~Note:  The coordinate_system_type data element should be used in con-
  sub_spacecraft_longitude~subsclon~junction with this data element
  sub_solar_azimuth~subsolaz~The sub_solar_azimuth element provides the value of the
  sub_solar_azimuth~subsolaz~angle between the line from the center of an image to the
  sub_solar_azimuth~subsolaz~subsolar point and a horizontal reference line (in the
  sub_solar_azimuth~subsolaz~image plane) extending from the image center to the middle
  sub_solar_azimuth~subsolaz~right edge of the image.
  sub_solar_azimuth~subsolaz~The values of this angle increase in a clockwise direction.
  sub_solar_latitude~subsollat~The sub_solar_latitude element provides the latitude of the subsolar
  sub_solar_latitude~subsollat~point.  The subsolar point is that point on a body's reference surface
  sub_solar_latitude~subsollat~where a line from the body center to the sun center intersects that
  sub_solar_latitude~subsollat~surface.
  sub_solar_longitude~subsollon~The sub_solar_longitude element provides the longitude of the subsolar
  sub_solar_longitude~subsollon~point.  The subsolar point is that point on a body's reference surface
  sub_solar_longitude~subsollon~where a line from the body center to the sun center intersects that
  sub_solar_longitude~subsollon~surface.
  sub_solar_longitude~subsollon~ 
  sub_solar_longitude~subsollon~Note:  The coordinate_system_type data element should be used in con-
  sub_solar_longitude~subsollon~junction with this data element
  suffix_high_instr_sat~suffhinstsat~The xxx_suffix_high_instr_sat element of a 1-3 dimensional
  suffix_high_instr_sat~suffhinstsat~qube object (where xxx is an axis name of the qube)
  suffix_high_instr_sat~suffhinstsat~provides the sequence of high instrument saturation values
  suffix_high_instr_sat~suffhinstsat~of the suffix items along the xxx axis.  The length of the
  suffix_high_instr_sat~suffhinstsat~sequence is specified by the axes element, and its order
  suffix_high_instr_sat~suffhinstsat~must correspond to the order of names in the
  suffix_high_instr_sat~suffhinstsat~xxx_suffix_names element.  In a Standard ISIS Qube, the
  suffix_high_instr_sat~suffhinstsat~axis names are restricted to SAMPLE, LINE and BAND.  For
  suffix_high_instr_sat~suffhinstsat~the BAND axis, for example, the element will be named
  suffix_high_instr_sat~suffhinstsat~BAND_SUFFIX_HIGH_INSTR_SAT.
  suffix_high_instr_sat~suffhinstsat~Each high instrument saturation value identifies the special
  suffix_high_instr_sat~suffhinstsat~value whose presence indicates the measuring instrument was
  suffix_high_instr_sat~suffhinstsat~saturated at the high end.  This value must be algebraically
  suffix_high_instr_sat~suffhinstsat~less than the value of the xxx_suffix_valid_minimum element.
  suffix_high_instr_sat~suffhinstsat~For Standard ISIS Qubes, a value been chosen by ISIS
  suffix_high_instr_sat~suffhinstsat~convention.  The general data type of the value is
  suffix_high_instr_sat~suffhinstsat~determined by the corresponding xxx_suffix_item_type
  suffix_high_instr_sat~suffhinstsat~element. If the latter is integer or unsigned integer, the
  suffix_high_instr_sat~suffhinstsat~general data type is integer.  If core_item_type is real,
  suffix_high_instr_sat~suffhinstsat~the value will be hardware- specific (or rather
  suffix_high_instr_sat~suffhinstsat~floating-point-representation-specific) so that it may be
  suffix_high_instr_sat~suffhinstsat~specified exactly near the bottom of the allowable range of
  suffix_high_instr_sat~suffhinstsat~values. A non-decimal (hexadecimal) general data type is
  suffix_high_instr_sat~suffhinstsat~used for this purpose; e.g. 16#FFFCFFFF# for a VAX.
  suffix_item_type~suffitemtype~The xxx_suffix_item_type element of a 1-3 dimensional qube
  suffix_item_type~suffitemtype~object (where xxx is an axis_name of the qube) provides the
  suffix_item_type~suffitemtype~sequence of data types of the suffix items along the xxx
  suffix_item_type~suffitemtype~axis. The length of the sequence is specified by the axes
  suffix_item_type~suffitemtype~element, and its order must correspond to the order of
  suffix_item_type~suffitemtype~names in the xxx_suffix_names element. In a Standard ISIS
  suffix_item_type~suffitemtype~Qube, the axis names are restricted to SAMPLE, LINE and
  suffix_item_type~suffitemtype~BAND.  For the BAND axis, for example, the element will be
  suffix_item_type~suffitemtype~named BAND_SUFFIX_ITEM_TYPE.
  suffix_item_bytes~suffitmbytes~The xxx_suffix_item_bytes element of a 1-3 dimensional qube
  suffix_item_bytes~suffitmbytes~object (where xxx is an axis_name of the qube) provides the
  suffix_item_bytes~suffitmbytes~sequence of sizes (in bytes) of the suffix items along the
  suffix_item_bytes~suffitmbytes~xxx axis. Though all items occupy the number of bytes
  suffix_item_bytes~suffitmbytes~specified by the suffix_bytes element, an item may be
  suffix_item_bytes~suffitmbytes~defined to be less than 4 bytes in length.  The length of
  suffix_item_bytes~suffitmbytes~the sequence is specified by the axes element, and its
  suffix_item_bytes~suffitmbytes~order must correspond to the order of names in the
  suffix_item_bytes~suffitmbytes~xxx_suffix_names element.  In a Standard ISIS Qube, the
  suffix_item_bytes~suffitmbytes~axis names are restricted to SAMPLE, LINE and BAND. For the
  suffix_item_bytes~suffitmbytes~BAND axis, for example, the element will be named
  suffix_item_bytes~suffitmbytes~BAND_SUFFIX_ITEM_BYTES.
  suffix_base~suffixbase~The xxx_suffix_base element of a 1-3 dimensional qube
  suffix_base~suffixbase~object (where xxx is an axis_name of the qube) provides the
  suffix_base~suffixbase~sequence of base values of the suffix items along the xxx
  suffix_base~suffixbase~axis. The length of the sequence is specified by the axes
  suffix_base~suffixbase~element, and its order must correspond to the order of
  suffix_base~suffixbase~names in the xxx_suffix_names element.  In a Standard ISIS
  suffix_base~suffixbase~Qube, the axis names are restricted to SAMPLE, LINE and
  suffix_base~suffixbase~BAND. For the BAND axis, for example, the element will be
  suffix_base~suffixbase~named BAND_SUFFIX_BASE.  Each base value, together with the
  suffix_base~suffixbase~corresponding multiplier, describes the scaling performed
  suffix_base~suffixbase~on a 'true' data value to compute the value stored in the
  suffix_base~suffixbase~suffix location.  It also defines the method for recovering
  suffix_base~suffixbase~the 'true' value:
  suffix_base~suffixbase~'true' value =  base + multiplier * stored value
  suffix_base~suffixbase~In ISIS practice, the value of the base is
  suffix_base~suffixbase~0.0 for real items, since scaling is not usually necessary
  suffix_base~suffixbase~for floating point data.
  suffix_base~suffixbase~NOTE: Base and multiplier correspond directly to the
  suffix_base~suffixbase~data elements OFFSET and SCALING_FACTOR.
  suffix_bytes~suffixbytes~The suffix_bytes element identifies the allocation in bytes
  suffix_bytes~suffixbytes~of each suffix data value.  It is the unit of the
  suffix_bytes~suffixbytes~dimensions specified by the suffix_items element.  In the
  suffix_bytes~suffixbytes~current build of ISIS, suffix_bytes must always be 4.  This
  suffix_bytes~suffixbytes~means that all suffix items (unlike core items) occupy 4
  suffix_bytes~suffixbytes~bytes, even though in some cases the defined suffix data
  suffix_bytes~suffixbytes~value may be less than 4 bytes in length.
  suffix_items~suffixitems~The suffix_items element provides the sequence of
  suffix_items~suffixitems~dimensions of the suffix areas of a qube data object.  The
  suffix_items~suffixitems~suffix size of the most frequently varying axis is given
  suffix_items~suffixitems~first.  The length of the sequence is specified by the axes
  suffix_items~suffixitems~element, and its order must correspond to the order of
  suffix_items~suffixitems~dimensions in the core_items element, and the order of
  suffix_items~suffixitems~names in the axis_name element.  Each suffix dimension is
  suffix_items~suffixitems~measured in units of the suffix_bytes element.  In a
  suffix_items~suffixitems~Standard ISIS Qube, suffix items along the SAMPLE, LINE and
  suffix_items~suffixitems~BAND axes correspond to 'sideplanes', bottomplanes' and
  suffix_items~suffixitems~'backplanes', respectively, of the core of the qube.
  suffix_multiplier~suffixmult~The xxx_suffix_multiplier element of a 1-3 dimensional qube
  suffix_multiplier~suffixmult~object (where xxx is an axis_name of the qube) provides the
  suffix_multiplier~suffixmult~sequence of multipliers of the suffix items along the xxx
  suffix_multiplier~suffixmult~axis. The length of the sequence is specified by the axes
  suffix_multiplier~suffixmult~element, and its order must correspond to the order of
  suffix_multiplier~suffixmult~names in the xxx_suffix_names element. In a Standard ISIS
  suffix_multiplier~suffixmult~Qube, the axis names are restricted to SAMPLE, LINE and
  suffix_multiplier~suffixmult~BAND.  For the BAND axis, for example, the element will be
  suffix_multiplier~suffixmult~named BAND_SUFFIX_MULTIPLIER.  Each multiplier, together
  suffix_multiplier~suffixmult~with the corresponding base value, describes the scaling
  suffix_multiplier~suffixmult~performed on a 'true' data value to compute the value
  suffix_multiplier~suffixmult~stored in the suffix location.  It also defines the method
  suffix_multiplier~suffixmult~for recovering the 'true' value:
  suffix_multiplier~suffixmult~'true'_value =  base + multiplier * stored_value
  suffix_multiplier~suffixmult~ In ISIS practice, the value of
  suffix_multiplier~suffixmult~the multiplier is 1.0 for real items, since scaling is not
  suffix_multiplier~suffixmult~usually necessary for floating point data.
  suffix_name~suffixname~The xxx_suffix_name element of a 1-3 dimensional qube
  suffix_name~suffixname~object (where xxx is an axis_name of the qube) provides the
  suffix_name~suffixname~sequence of names of the suffix items along the xxx axis.
  suffix_name~suffixname~The length of the sequence is specified by the axes
  suffix_name~suffixname~element, and its order must correspond to the order of
  suffix_name~suffixname~dimensions in the core_items and suffix_items elements.  In
  suffix_name~suffixname~a Standard ISIS Qube, the axis names are restricted to
  suffix_name~suffixname~SAMPLE, LINE and BAND.  For the BAND axis, for example, the
  suffix_name~suffixname~element will be named BAND_SUFFIX_NAME.  Band suffix planes
  suffix_name~suffixname~(backplanes) are commonly used to store geometry and other
  suffix_name~suffixname~information corresponding at each pixel to the pixels of
  suffix_name~suffixname~the core planes, such as latitude and longitude.
  suffix_null~suffixnull~The xxx_suffix_null element of a 1-3 dimensional qube
  suffix_null~suffixnull~object (where xxx is an axis name of the qube) provides the
  suffix_null~suffixnull~sequence of null values of the suffix items along the xxx
  suffix_null~suffixnull~axis. The length of the sequence is specified by the axes
  suffix_null~suffixnull~element, and its order must correspond to the order of
  suffix_null~suffixnull~names in the xxx_suffix_names element.  In a Standard ISIS
  suffix_null~suffixnull~Qube, the axis names are restricted to SAMPLE, LINE and
  suffix_null~suffixnull~BAND. For the BAND axis, for example, the element will be
  suffix_null~suffixnull~named BAND_SUFFIX_NULL.
  suffix_null~suffixnull~Each null value identifies the special value whose presence
  suffix_null~suffixnull~ indicates missing data.  This value must be algebraically
  suffix_null~suffixnull~less than the value of the xxx_suffix_valid_minimum
  suffix_null~suffixnull~element.  For Standard ISIS Qubes, the null value is chosen
  suffix_null~suffixnull~to be the algebraically smallest value allowed by
  suffix_null~suffixnull~the xxx_suffix_item_type and xxx_suffix_item_bytes
  suffix_null~suffixnull~elements.  The general data type of the null value is
  suffix_null~suffixnull~determined by the corresponding xxx_suffix_item_type
  suffix_null~suffixnull~element.  If the latter is integer or unsigned integer,
  suffix_null~suffixnull~the general data type is integer.  If core_item_type
  suffix_null~suffixnull~is real, the value will be hardware-specific
  suffix_null~suffixnull~(or rather floating-point-representation-specific)
  suffix_null~suffixnull~so that it may be specified exactly at the bottom of the
  suffix_null~suffixnull~allowable range of values. A non-decimal (hexadecimal)
  suffix_null~suffixnull~general data type is used for this purpose; e.g.
  suffix_null~suffixnull~16#FFFFFFFF# for a VAX.  NOTE: The SUFFIX_NULL element
  suffix_null~suffixnull~corresponds directly to the PDS standard data element
  suffix_null~suffixnull~MISSING.
  suffix_unit~suffixunit~The xxx_suffix_unit element of a 1-3 dimensional qube
  suffix_unit~suffixunit~object (where xxx is an axis_name of the qube) provides the
  suffix_unit~suffixunit~sequence of scientific units of the suffix items along the
  suffix_unit~suffixunit~xxx axis. The length of the sequence is specified by the
  suffix_unit~suffixunit~axes element, and its order must correspond to the order of
  suffix_unit~suffixunit~names in the xxx_suffix_names element.  In a Standard ISIS
  suffix_unit~suffixunit~Qube, the axis names are restricted to SAMPLE, LINE and
  suffix_unit~suffixunit~BAND. For the BAND axis, for example, the element will be
  suffix_unit~suffixunit~named BAND_SUFFIX_UNIT.
  suffix_low_instr_sat~sufflinstsat~The xxx_suffix_low_instr_sat element of a 1-3 dimensional
  suffix_low_instr_sat~sufflinstsat~qube object (where xxx is an axis_name of the qube)
  suffix_low_instr_sat~sufflinstsat~provides the sequence of low instrument saturation values
  suffix_low_instr_sat~sufflinstsat~of the suffix items along the xxx axis.  The length of the
  suffix_low_instr_sat~sufflinstsat~sequence is specified by the axes element, and its order
  suffix_low_instr_sat~sufflinstsat~must correspond to the order of names in the
  suffix_low_instr_sat~sufflinstsat~xxx_suffix_names element.  In a Standard ISIS Qube, the
  suffix_low_instr_sat~sufflinstsat~axis names are restricted to SAMPLE, LINE and BAND.  For
  suffix_low_instr_sat~sufflinstsat~the BAND axis, for example, the element will be named
  suffix_low_instr_sat~sufflinstsat~BAND_SUFFIX_LOW_INSTR_SAT.
  suffix_low_instr_sat~sufflinstsat~Each low instrument saturation value identifies the special
  suffix_low_instr_sat~sufflinstsat~value whose presence indicates the measuring instrument
  suffix_low_instr_sat~sufflinstsat~was saturated at the low end.  This value must be
  suffix_low_instr_sat~sufflinstsat~algebraically less than the value of the
  suffix_low_instr_sat~sufflinstsat~xxx_suffix_valid_minimum element.  For Standard ISIS Qubes,
  suffix_low_instr_sat~sufflinstsat~a value been chosen by ISIS convention.  The general data
  suffix_low_instr_sat~sufflinstsat~type of the value is determined by the corresponding
  suffix_low_instr_sat~sufflinstsat~xxx_suffix_item_type element. If the latter is integer or
  suffix_low_instr_sat~sufflinstsat~unsigned integer, the general data type is integer.  If
  suffix_low_instr_sat~sufflinstsat~core_item_type is real, the value will be hardware-
  suffix_low_instr_sat~sufflinstsat~specific (or rather floating-point-representation-specific)
  suffix_low_instr_sat~sufflinstsat~so that it may be specified exactly near the bottom of the
  suffix_low_instr_sat~sufflinstsat~allowable range of values. A non-decimal (hexadecimal)
  suffix_low_instr_sat~sufflinstsat~general data type is used for this purpose; e.g.
  suffix_low_instr_sat~sufflinstsat~16#FFFDFFFF# for a VAX.
  suffix_low_repr_sat~sufflreprsat~The xxx_suffix_low_repr_sat element of a 1-3 dimensional
  suffix_low_repr_sat~sufflreprsat~qube object (where xxx is an axis_name of the qube)
  suffix_low_repr_sat~sufflreprsat~provides the sequence of low representation saturation
  suffix_low_repr_sat~sufflreprsat~values of the suffix items along the xxx axis.  The length
  suffix_low_repr_sat~sufflreprsat~of the sequence is specified by the axes element, and its
  suffix_low_repr_sat~sufflreprsat~order must correspond to the order of names in the
  suffix_low_repr_sat~sufflreprsat~xxx_suffix_names element.  In a Standard ISIS Qube, the
  suffix_low_repr_sat~sufflreprsat~axis names are restricted to SAMPLE, LINE and BAND.  For
  suffix_low_repr_sat~sufflreprsat~the BAND axis, for example, the element will be named
  suffix_low_repr_sat~sufflreprsat~BAND_SUFFIX_LOW_REPR_SAT.
  suffix_low_repr_sat~sufflreprsat~Each low representation saturation value identifies the
  suffix_low_repr_sat~sufflreprsat~special value whose presence indicates the true value cannot
  suffix_low_repr_sat~sufflreprsat~ be represented in the chosen data type and length
  suffix_low_repr_sat~sufflreprsat~-- in this case being below the allowable range --
  suffix_low_repr_sat~sufflreprsat~which may happen during conversion from another data type.
  suffix_low_repr_sat~sufflreprsat~This value must be algebraically less than the value of
  suffix_low_repr_sat~sufflreprsat~the xxx_suffix_valid_minimum element.
  suffix_low_repr_sat~sufflreprsat~For Standard ISIS Qubes, a value has been chosen
  suffix_low_repr_sat~sufflreprsat~by ISIS convention.  The general data type of the value is
  suffix_low_repr_sat~sufflreprsat~determined by the corresponding xxx_suffix_item_type
  suffix_low_repr_sat~sufflreprsat~element. If the latter is integer or unsigned integer, the
  suffix_low_repr_sat~sufflreprsat~general data type is integer.  If the corresponding
  suffix_low_repr_sat~sufflreprsat~xx_suffix_item_type is real, the value will be
  suffix_low_repr_sat~sufflreprsat~hardware-specific (or rather floating-point-representation-
  suffix_low_repr_sat~sufflreprsat~specific) so that it may be specified exactly near the
  suffix_low_repr_sat~sufflreprsat~bottom of the allowable range of values.  A non-decimal
  suffix_low_repr_sat~sufflreprsat~(hexadecimal) general data type is used for this purpose;
  suffix_low_repr_sat~sufflreprsat~e.g. 16#FFFEFFFF# for a VAX.
  suffix_valid_minimum~suffvalidmin~The xxx_suffix_valid_minimum element of a 1-3 dimensional
  suffix_valid_minimum~suffvalidmin~qube object (where xxx is an axis_name of the qube)
  suffix_valid_minimum~suffvalidmin~provides the sequence of valid minima of the suffix items
  suffix_valid_minimum~suffvalidmin~along the xxx axis. The length of the sequence is specified
  suffix_valid_minimum~suffvalidmin~by the axes element, and its order must correspond to the
  suffix_valid_minimum~suffvalidmin~order of names in the xxx_suffix_names element.  In a
  suffix_valid_minimum~suffvalidmin~Standard ISIS Qube, the axis names are restricted to
  suffix_valid_minimum~suffvalidmin~SAMPLE, LINE and BAND. For the BAND axis, for example, the
  suffix_valid_minimum~suffvalidmin~element will be named BAND_SUFFIX_VALID_MINIMUM.
  suffix_valid_minimum~suffvalidmin~Suffix item values algebraically less than the corresponding
  suffix_valid_minimum~suffvalidmin~valid minimum are reserved for special values indicating
  suffix_valid_minimum~suffvalidmin~missing data or various types of invalid data.  The general
  suffix_valid_minimum~suffvalidmin~data type of this element is determined by the
  suffix_valid_minimum~suffvalidmin~xxx_suffix_item_type element.  If the latter is integer or
  suffix_valid_minimum~suffvalidmin~unsigned integer, the general data type is integer.  If
  suffix_valid_minimum~suffvalidmin~xxx_suffix_item_type is real, the general data type is
  suffix_valid_minimum~suffvalidmin~non-decimal (hexadecimal, e.g. 16#FFEFFFFF#) so that a
  suffix_valid_minimum~suffvalidmin~hardward-specific special value may be specified exactly.
  suffix_high_repr_sat~sufhreprsat~The xxx_suffix_high_repr_sat element of a 1-3 dimensional
  suffix_high_repr_sat~sufhreprsat~qube object (where xxx is an axis name of the qube)
  suffix_high_repr_sat~sufhreprsat~provides the sequence of high representation saturation
  suffix_high_repr_sat~sufhreprsat~values of the suffix items along the xxx axis.  The length
  suffix_high_repr_sat~sufhreprsat~of the sequence is specified by the axes element, and its
  suffix_high_repr_sat~sufhreprsat~order must correspond to the order of names in the
  suffix_high_repr_sat~sufhreprsat~xxx_suffix_names element.  In a Standard ISIS Qube, the
  suffix_high_repr_sat~sufhreprsat~axis names are restricted to SAMPLE, LINE and BAND.  For
  suffix_high_repr_sat~sufhreprsat~the BAND axis, for example, the element will be named
  suffix_high_repr_sat~sufhreprsat~BAND_SUFFIX_HIGH_REPR_SAT.
  suffix_high_repr_sat~sufhreprsat~Each high representation saturation value identifies
  suffix_high_repr_sat~sufhreprsat~the special value whose presence indicates the true
  suffix_high_repr_sat~sufhreprsat~value cannot be represented in the chosen data type and
  suffix_high_repr_sat~sufhreprsat~length -- in this case being above the allowable range --
  suffix_high_repr_sat~sufhreprsat~which may happen during conversion from another data type.
  suffix_high_repr_sat~sufhreprsat~This value must be algebraically less than the value of
  suffix_high_repr_sat~sufhreprsat~the xxx_suffix_valid_minimum element.  For Standard ISIS
  suffix_high_repr_sat~sufhreprsat~Qubes, a value has been chosen by ISIS convention.
  suffix_high_repr_sat~sufhreprsat~The general data type of the value is determined by the
  suffix_high_repr_sat~sufhreprsat~corresponding xxx_suffix_item_type element.  If the latter
  suffix_high_repr_sat~sufhreprsat~is integer or unsigned integer, the general data type is
  suffix_high_repr_sat~sufhreprsat~integer.  If the corresponding xxx_suffix_item_type is
  suffix_high_repr_sat~sufhreprsat~real, the value will be hardware-specific
  suffix_high_repr_sat~sufhreprsat~(or rather floating-point-representation-specific)
  suffix_high_repr_sat~sufhreprsat~so that it may be specified exactly near the
  suffix_high_repr_sat~sufhreprsat~bottom of the allowable range of values.  A non-decimal
  suffix_high_repr_sat~sufhreprsat~(hexadecimal) general data type is used for this purpose;
  suffix_high_repr_sat~sufhreprsat~e.g. 16#FFFBFFFF# for a VAX.
  support_request_desc~supreqd~The support_request_desc element provides a textual
  support_request_desc~supreqd~description of an official PDS support request as recorded
  support_request_desc~supreqd~by the PDS operator after talking with a PDS user about a
  support_request_desc~supreqd~problem with the PDS.
  support_request_date~supreqdate~The support_request_date element provides the date that a
  support_request_date~supreqdate~support request was taken by the PDS operator.
  support_request_no~suprequestnu~The support_request_number provides a computer assigned
  support_request_no~suprequestnu~unique number given to each support request recorded by the
  support_request_no~suprequestnu~Central Node PDS operator.
  support_resolution~supres~The support_resolution element provides the textual
  support_resolution~supres~description of the resolution to a problem recorded by the
  support_resolution~supres~PDS operator.
  support_resolution_date~supresdate~The support_resolution_date element provides the date that
  support_resolution_date~supresdate~a support request was resolved by the PDS.
  support_staff_full_name~supstaffname~The support_staff_name element provides the full name of the
  support_staff_full_name~supstaffname~PDS person entering the support request information into
  support_staff_full_name~supstaffname~the PDS.  See also:  full_name.
  surface_temperature~surfacetemp~ The surface_temperature element provides the value of the
  surface_temperature~surfacetemp~physical surface temperature of the radiometer footprint,
  surface_temperature~surfacetemp~calculated from average_planetary_radius and the
  surface_temperature~surfacetemp~project-adopted atmospheric model.
  surface_clarity_percentage~surfclarpct~The surface_clarity_percentage element provides an estimate
  surface_clarity_percentage~surfclarpct~of the fraction of an image or observation of a surface
  surface_clarity_percentage~surfclarpct~which is unobscured (as by clouds).
  surface_clarity_percentage~surfclarpct~Surface_clarity_percentage is defined as the ratio of the
  surface_clarity_percentage~surfclarpct~unobscured area to the total observed area.
  surface_gravity~surfgrav~The surface_gravity element provides the average
  surface_gravity~surfgrav~gravitational acceleration at the surface of a target body.
  surface_gravity~surfgrav~Surface_gravity is computed from the mass and mean radius
  surface_gravity~surfgrav~of the target body.
  software_accessibility_desc~swaccessd~The software_access_desc element provides a description of
  software_accessibility_desc~swaccessd~the software's accessibility related to the software_type element.
  software_desc~swd~The software_desc element describes the functions performed
  software_desc~swd~by the data processing software.  If the subject software is
  software_desc~swd~a program library, this element may provide a list of the
  software_desc~swd~contents of the library.
  software_flag~swflag~The software_flag element is a yes-or-no flag which
  software_flag~swflag~indicates whether documented software exists which can be
  software_flag~swflag~used to process a data set.
  software_id~swid~The software_id element is a short-hand notation for the software name,
  software_id~swid~typically sixteen characters in length or less (e.g., tbtool,lablib3).
  software_license_type~swlicensetyp~The software_license_type element indicates the licensing category
  software_license_type~swlicensetyp~under which this software falls.
  software_name~swname~The software_name element identifies data processing
  software_name~swname~software such as a program or a program library.
  software_purpose~swpurpose~The software_purpose element describes the intended use of the
  software_purpose~swpurpose~software.
  software_release_date~swreleasedt~The software_release_date element provides the date as of
  software_release_date~swreleasedt~which a program was released for use.
  software_release_date~swreleasedt~Formation rule:  YYYY-MM-DD
  software_type~swtype~The software_type element associates a PDS software type
  software_type~swtype~with the processing software.
  software_version_id~swverid~The software_version_id element indicates the version
  software_version_id~swverid~(development level) of a program or a program library.
  synodic_rotation_period~synrotper~The synodic_rotation_period element provides the time
  synodic_rotation_period~synrotper~period required for a solar system object to complete one
  synodic_rotation_period~synrotper~full rotation about its primary, returning to the same
  synodic_rotation_period~synrotper~position in space relative to its primary.
  system_bulletin_desc~sysbulletd~The system_bulletin_desc element is the text of a PDS
  system_bulletin_desc~sysbulletd~system bulletin.
  system_bulletin_date~sysbulletdt~The system_bulletin_date element is the date and time
  system_bulletin_date~sysbulletdt~when the PDS operator logged a PDS system bulletin.
  system_bulletin_id~sysbulletid~The system_bulletin_id element is a unique integer that
  system_bulletin_id~sysbulletid~identifies a PDS system bulletin.
  system_bulletin_type~sysbullettyp~The system_bulletin_type element is a keyword that
  system_bulletin_type~sysbullettyp~describes the type of bulletin displayed.
  system_classification_id~sysclassid~The system_classification_id data element identifies a
  system_classification_id~sysclassid~data element or object according to the data system that
  system_classification_id~sysclassid~uses it.  In this document, system_classification_id is an
  system_classification_id~sysclassid~indexing mechanism for data element names, to allow them to
  system_classification_id~sysclassid~be identified as either system-specific, or recommended for
  system_classification_id~sysclassid~common use.  See also:  general_classification_type.
  system_event_date~sysevtdate~The system_event_date element provides the beginning date
  system_event_date~sysevtdate~of a PDS scheduled event.
  system_event_user_note~sysevtusernt~The system_event_user_note element provides information
  system_event_user_note~sysevtusernt~about a system event.
  system_event_user_note~sysevtusernt~Example value:  THE SYSTEM WILL BE DOWN FOR PREVENTATIVE
  system_event_user_note~sysevtusernt~MAINTENANCE FROM NOON UNTIL MIDNIGHT.
  system_expertise_level~sysexprtlvl~The system_expertise_level element identifies an
  system_expertise_level~sysexprtlvl~individual's level of expertise in the use of the PDS
  system_expertise_level~sysexprtlvl~capabilities.
  target_center_distance~targctrdist~The target_center_distance element provides the distance
  target_center_distance~targctrdist~between an instrument and the center of mass of the named target.
  target_desc~targetd~The target_desc element describes the
  target_desc~targetd~characteristics of a particular target.
  target_name~targname~The  target_name element identifies a target.  The target
  target_name~targname~may be a planet, satellite,ring,region, feature,
  target_name~targname~asteroid or comet. See target_type.
  target_parameter_name~targparmname~The target_parameter_name element provides the name of
  target_parameter_name~targparmname~a dynamic or physical parameter associated with a given
  target_parameter_name~targparmname~target.  This element may take as values only those
  target_parameter_name~targparmname~names that are proper element names for the various
  target_parameter_name~targparmname~dynamic and physical parameters cataloged as part of
  target_parameter_name~targparmname~target information.  Example values:  BOND_ALBEDO,
  target_parameter_name~targparmname~MEAN_SURFACE_TEMPERATURE, OBLIQUITY,
  target_parameter_name~targparmname~ORBITAL_INCLINATION.
  target_parameter_uncertainty~targparmunct~The target_parameter_uncertainty element provides the
  target_parameter_uncertainty~targparmunct~numeric value of the uncertainty associated with the value
  target_parameter_uncertainty~targparmunct~given for a particular target parameter, whose name is
  target_parameter_uncertainty~targparmunct~provided in the associated target_parameter_name element.
  target_parameter_uncertainty~targparmunct~The uncertainty is expressed in the same units as the value
  target_parameter_uncertainty~targparmunct~of the parameter itself, and gives some measure of the
  target_parameter_uncertainty~targparmunct~provider's estimate of the reliability of a particular value
  target_parameter_uncertainty~targparmunct~stored in the catalog. See also target_parameter_value.
  target_parameter_value~targparmval~The target_parameter_value element provides the numeric
  target_parameter_value~targparmval~value associated with a particular target parameter, whose
  target_parameter_value~targparmval~name is provided in the associated target_parameter_name
  target_parameter_value~targparmval~element.  Each value provided is associated with a
  target_parameter_value~targparmval~particular source, which is completely referenced in the
  target_parameter_value~targparmval~associated data_source_desc. See also
  target_parameter_value~targparmval~target_parameter_uncertainty, target_parameter_epoch.
  target_parameter_epoch~targprmepoch~The target_parameter_epoch element provides the reference
  target_parameter_epoch~targprmepoch~epoch for the value associated with a particular target
  target_parameter_epoch~targprmepoch~parameter, whose name is provided in the
  target_parameter_epoch~targprmepoch~target_parameter_name element. The reference epoch is the
  target_parameter_epoch~targprmepoch~date and time associated with measurement of a quantity
  target_parameter_epoch~targprmepoch~which may vary with time.  For example, the value provided
  target_parameter_epoch~targprmepoch~for the obliquity of a planet will be given for a
  target_parameter_epoch~targprmepoch~measurement taken at a specified time.  That time will be
  target_parameter_epoch~targprmepoch~referenced in the target_parameter_epoch element.  See also
  target_parameter_epoch~targprmepoch~target_parameter_value.
  target_type~targtype~The target_type element identifies the type of a named
  target_type~targtype~target.
  target_type~targtype~Example values:  PLANET, SATELLITE, RING, REGION, FEATURE,
  target_type~targtype~ASTEROID, COMET.
  task_name~taskname~The task_name element identifies the task with which an
  task_name~taskname~individual is or was affiliated during his or her
  task_name~taskname~association with a particular institution.
  task_name~taskname~Note that `task' affiliations are distinct from
  task_name~taskname~`mission' affiliations.
  table_bl_name~tblblname~The table_bl_name element represents the data base tersename
  table_bl_name~tblblname~used by the loader software to map a template value to a
  table_bl_name~tblblname~column in a table.  There exists a unique mapping for each
  table_bl_name~tblblname~template keyword=value occurrence
  table_bl_name~tblblname~identifies the data base column.  The formulation of the
  table_bl_name~tblblname~tblblname is governed by rules and abbreviations as defined
  table_bl_name~tblblname~in the PDS Data Administration Plan document.
  table_desc~tbld~The table_desc element provides the ascii text description
  table_desc~tbld~for a table in the PDS data base.
  table_name~tblname~The table_name element provides a unique name for a table
  table_name~tblname~in the PDS data base.  All tables in the data base will have
  table_name~tblname~a name and a description.
  table_storage_type~tblstortype~The table_storage_type element indicates the order of
  table_storage_type~tblstortype~storage for entries in a table.  For enhanced portability
  table_storage_type~tblstortype~and ease of display, the default and recommended storage
  table_storage_type~tblstortype~type for tables is row major.
  table_type~tbltype~The table_type element denotes whether the table contains
  table_type~tbltype~High Level Catalog data, Detailed Level Catalog Data
  table_type~tbltype~(Image), Detailed Level Catalog (Fields and Particles) data,
  table_type~tbltype~ or system data.  Examples:  H, F, I, or S
  technical_support_type~techsupport~The technical_support_type element indicates the type of support
  technical_support_type~techsupport~provided for a piece of software. SOURCE_NAME          		= "PDS CN/S.
  technical_support_type~techsupport~Hughes
  telephone_number~telephonenum~The telephone_number element provides the area code,
  telephone_number~telephonenum~telephone number and extension (if any) of an individual or
  telephone_number~telephonenum~node.  See also:  fts_number.
  telescope_site_radius~telsiterad~ The telescope_site_radius element indicates the radial
  telescope_site_radius~telsiterad~distance of a telescope site from the Earth's center.
  temperature_translation_desc~temptransd~The temperature_translation_desc element provides
  temperature_translation_desc~temptransd~the conversion necessary to translate an instrument's
  temperature_translation_desc~temptransd~transmitted temperature reading to a value which is
  temperature_translation_desc~temptransd~relative to a standard temperature scale.
  terse_name~tersename~The terse_name element supplies a twelve-character unique
  terse_name~tersename~identifier for a data element and is an alternative to the
  terse_name~tersename~thirty-character data element name.  In the PDS, the terse
  terse_name~tersename~name is an abbreviation of the data element name, according
  terse_name~tersename~to the abbreviations documented in the Planetary Science
  terse_name~tersename~Data Dictionary.
  threshold_cost~thrshldcost~The threshold_cost element provides the maximum cost which
  threshold_cost~thrshldcost~is compared to the order item's calculated cost.  When the
  threshold_cost~thrshldcost~threshold cost is exceeded, the order item is not accepted
  threshold_cost~thrshldcost~by the PDS order function.
  time_from_closest_approach~timeclsapr~The time_from_closest_approach element provides the time with respect
  time_from_closest_approach~timeclsapr~to periapsis or closest approach.
  telescope_latitude~tlat~The telescope_latitude element indicates the planetographic
  telescope_latitude~tlat~latitude of a telescope site on the Earth's surface.
  telescope_longitude~tlong~ The telescope_longitude element indicates the longitude of
  telescope_longitude~tlong~a telescope site on the Earth's surface.  East longitudes
  telescope_longitude~tlong~are positive and west longitudes are negative.
  telescope_diameter~tlscpdiam~The telescope_diameter element provides the diameter of the
  telescope_diameter~tlscpdiam~primary mirror of a telescope.
  telescope_f_number~tlscpfnum~The telescope_f_number element provides the value of the
  telescope_f_number~tlscpfnum~ratio of the focal length to the aperture of a telescope.
  telescope_focal_length~tlscpfoclen~The telescope_focal_length element provides the total
  telescope_focal_length~tlscpfoclen~optical path distance from the first element of the optics
  telescope_focal_length~tlscpfoclen~to the focal point of a telescope.
  telescope_id~tlscpid~The telescope_id element uniquely identifies a particular
  telescope_id~tlscpid~telescope.
  telescope_resolution~tlscpres~The telescope_resolution element provides the achievable
  telescope_resolution~tlscpres~angular resolution of a telescope.
  telescope_serial_number~tlscpserlnum~The telescope_serial_number element provides the serial
  telescope_serial_number~tlscpserlnum~number of a telescope.
  telescope_t_number~tlscptnum~The telescope_t_number element provides the effective
  telescope_t_number~tlscptnum~f_number of a telescope.
  telescope_t_number~tlscptnum~Note that the t_number differs from the f_number due to
  telescope_t_number~tlscptnum~losses in the optical system.
  telescope_t_number_error~tlscptnumerr~The telescope_t_number_error element indicates the error
  telescope_t_number_error~tlscptnumerr~associated with the t_number value for a particular
  telescope_t_number_error~tlscptnumerr~telescope.
  telescope_transmittance~tlscpxmit~The telescope_transmittance element provides the
  telescope_transmittance~tlscpxmit~transmittance value for a telescope.  Transmittance is
  telescope_transmittance~tlscpxmit~defined as the ratio of transmitted to incident flux
  telescope_transmittance~tlscpxmit~through the telescope.
  template~tmplt~The template element provides the identifier that appears in
  template~tmplt~a physical template header.
  template_bl_name~tmpltblname~The template_bl_name element represents the data base terse
  template_bl_name~tmpltblname~name associated with a template keyword.  This tersename is
  template_bl_name~tmpltblname~used during construction of templates to provide a reference
  template_bl_name~tmpltblname~to the keyword
  template_bl_name~tmpltblname~a full data element name rather than the terse
  template_bl_name~tmpltblname~representation.  The formulation of the tmpltblname is
  template_bl_name~tmpltblname~governed by rules and abbreviations as defined in the PDS
  template_bl_name~tmpltblname~ Data Administration Plan document.
  template_name~tmpltname~The template_name element provides the name of a template
  template_name~tmpltname~object used in the PDS system and the bulk loading software.
  template_note~tmpltnote~The template_note element provides the textual description
  template_note~tmpltnote~of the purpose for a template object as related to the data
  template_note~tmpltnote~supplier.  This description is distributed whenever a
  template_note~tmpltnote~template is sent to a data supplier.
  template_revision_date~tmpltrevdate~The template_revision_date element indicates the latest
  template_revision_date~tmpltrevdate~revision date for a template (i.e. 11/22/88).
  template_status~tmpltstatus~The template_status element is updated by the loader
  template_status~tmpltstatus~software after certain events in the catalog loading
  template_status~tmpltstatus~process.  The value of this field indicates the current
  template_status~tmpltstatus~status of a template or sub-template in the load process.
  template_type~tmplttype~The template_type element provides a type or class of
  template_type~tmplttype~template object.
  template_use_indicator~tmpltuseind~The template_use_indicator element indicates whether or not
  template_use_indicator~tmpltuseind~template may recur within a set of templates.
  telemetry_format_id~tmtryfmtid~The TELEMETRY_FORMAT_ID element supplies a telemetry format
  telemetry_format_id~tmtryfmtid~code.
  total_fovs~totfovs~The total_fovs (fields-of-view) element indicates the total
  total_fovs~totfovs~number of fields of view associated with a single section of
  total_fovs~totfovs~an instrument.
  total_rescan_number~totrscannum~The TOTAL_RESCAN_NUMBER is the total number of rescan lines acquired.
  transfer_command_text~trnsfrcomtxt~The transfer_command_text element represents the complete
  transfer_command_text~trnsfrcomtxt~command used to create a data volume, such as COPY or
  transfer_command_text~trnsfrcomtxt~BACKUP for tape volumes.  It should also include special
  transfer_command_text~trnsfrcomtxt~flags that were used to perform the command (eg. tar -xvf).
  true_anomaly_angle~trueanomang~The true_anomaly_angle element provides the value of the angle between
  true_anomaly_angle~trueanomang~the line connecting an orbiting body and the body around which it is
  true_anomaly_angle~trueanomang~orbiting (its primary) and the line connecting the periapsis position
  true_anomaly_angle~trueanomang~and the primary.  True_anomaly is measured in the orbiting body's
  true_anomaly_angle~trueanomang~orbital plane in the direction of motion from periapsis.
  truth_window~truthwndw~ Galileo Solid State Imaging-specific. Images can be edited so that
  truth_window~truthwndw~only an image area or cut_out_window is compressed and transmitted to
  truth_window~truthwndw~Earth. Within this cut_out_window there can be an image area or
  truth_window~truthwndw~TRUTH_WINDOW of up to 96 X 96 pixels that will be transmitted with only
  truth_window~truthwndw~lossless Huffman compression applied. The truth_window element
  truth_window~truthwndw~indicates the location and size of this image area as defined by four
  truth_window~truthwndw~numbers: starting line, starting sample, number of lines, number of
  truth_window~truthwndw~samples (the origin of the image coordinate system is at
  truth_window~truthwndw~line,sample=1,1 for the upper-left corner with samples increasing to
  truth_window~truthwndw~the right and lines increasing down).
  tuple_sequence_number~tupseqnum~The tuple_sequence_number element is used in all text
  tuple_sequence_number~tupseqnum~tables where the ordering of the ASCII text rows is
  tuple_sequence_number~tupseqnum~required.  This element is used in all text type tables in
  tuple_sequence_number~tupseqnum~the PDS data base.
  twist_angle~twistangle~The twist_angle element provides the angle of rotation about an
  twist_angle~twistangle~optical axis relative to celestial coordinates. The RIGHT_ASCENSION,
  twist_angle~twistangle~DECLINATION and TWIST_ANGLE elements define the pointing direction
  twist_angle~twistangle~and orientation of an image or scan platform.
  twist_angle~twistangle~ 
  twist_angle~twistangle~Note: The specific mathematical definition of TWIST_ANGLE depends on
  twist_angle~twistangle~      the value of the TWIST_ANGLE_TYPE element. If unspecified,
  twist_angle~twistangle~      TWIST_ANGLE_TYPE = GALILEO for Galileo data and
  twist_angle~twistangle~      TWIST_ANGLE_TYPE = DEFAULT for all other data.
  twist_angle~twistangle~ 
  twist_angle~twistangle~Note: This element bears a simple relationship to the value of
  twist_angle~twistangle~      CELESTIAL_NORTH_CLOCK_ANGLE.
  twist_angle~twistangle~      When TWIST_ANGLE_TYPE = DEFAULT,
  twist_angle~twistangle~           TWIST_ANGLE = (180 - CELESTIAL_NORTH_CLOCK_ANGLE) mod 360;
  twist_angle~twistangle~      when TWIST_ANGLE_TYPE = GALILEO,
  twist_angle~twistangle~           TWIST_ANGLE = (270 - CELESTIAL_NORTH_CLOCK_ANGLE) mod 360.
  twist_angle_type~twistangtype~The twist_angle_type element determines the specific mathematical
  twist_angle_type~twistangtype~meaning of the element TWIST_ANGLE when it is used to specify the
  twist_angle_type~twistangtype~pointing of an image or scan platform. Allowed values are DEFAULT and
  twist_angle_type~twistangtype~GALILEO. If unspecified, the value is GALILEO for Galileo data and
  twist_angle_type~twistangtype~DEFAULT for all other data.
  twist_angle_type~twistangtype~ 
  twist_angle_type~twistangtype~The three elements RIGHT_ASCENSION,
  twist_angle_type~twistangtype~DECLINATION and TWIST_ANGLE define the C-matrix, which transforms a
  twist_angle_type~twistangtype~3-vector in celestial coordinates into a frame fixed to an image plane.
  twist_angle_type~twistangtype~Celestial coordinates refer to a frame in which the x-axis points
  twist_angle_type~twistangtype~toward the First Point of Aries and the z-axis points to the celestial
  twist_angle_type~twistangtype~pole; these coordinates are assumed to be in J2000 unless otherwise
  twist_angle_type~twistangtype~specified. Image plane coordinates are defined such that the x-axis
  twist_angle_type~twistangtype~points right, the y-axis points down, and the z-axis points along the
  twist_angle_type~twistangtype~camera's optic axis, when an image is displayed as defined by the
  twist_angle_type~twistangtype~SAMPLE_DISPLAY_DIRECTION and LINE_DISPLAY_DIRECTION elements.
  twist_angle_type~twistangtype~ 
  twist_angle_type~twistangtype~For TWIST_ANGLE_TYPE = DEFAULT, the C-matrix is equal to
  twist_angle_type~twistangtype~  C-matrix = [T]3 [90-D]1 [R+90]3
  twist_angle_type~twistangtype~ 
  twist_angle_type~twistangtype~ = |-sinR cosT-cosR sinD sinT  cosR cosT-sinR sinD sinT  cosD sinT|
  twist_angle_type~twistangtype~   | sinR sinT-cosR sinD cosT -cosR sinT-sinR sinD cosT  cosD cosT|
  twist_angle_type~twistangtype~   |        cosR cosD                 sinR cosD             sinD  |
  twist_angle_type~twistangtype~ 
  twist_angle_type~twistangtype~For TWIST_ANGLE_TYPE = GALILEO, the C-matrix is defined by
  twist_angle_type~twistangtype~  C-matrix = [T]3 [90-D]2 [R]3
  twist_angle_type~twistangtype~ 
  twist_angle_type~twistangtype~ = | sinR sinT+cosR sinD cosT  cosR sinT+sinR sinD cosT  -cosD cosT|
  twist_angle_type~twistangtype~   |-sinR cosT-cosR sinD sinT  cosR cosT-sinR sinD sinT   cosD sinT|
  twist_angle_type~twistangtype~   |        cosR cosD               sinR cosD               sinD   |
  twist_angle_type~twistangtype~ 
  twist_angle_type~twistangtype~Here the notation [X]n specifies a rotation about the nth axis by
  twist_angle_type~twistangtype~angle X (in degrees). R refers to right ascension, D to declination,
  twist_angle_type~twistangtype~and T to twist angle.
  twist_offset_angle~twistoffang~The twist_offset_angle element provides the angle at which
  twist_offset_angle~twistoffang~an instrument is mounted, measured perpendicular to the
  twist_offset_angle~twistoffang~plane defined by the cone and cross-cone axes.
  twist_offset_angle~twistoffang~See also cone_offset_angle and cross_cone_offset_angle.
  text_flag~txtflag~The text_flag element indicates whether or not a data
  text_flag~txtflag~element contains variable-length textual information (i.e.,
  text_flag~txtflag~a description, a note, or a summary).
  uncorrected_start_time~uncorrstrttm~The uncorrected_start_time element provides the time of the
  uncorrected_start_time~uncorrstrttm~observation as sent down by the spacecraft. This time may
  uncorrected_start_time~uncorrstrttm~be incorrect due to a software problem that existed onboard
  uncorrected_start_time~uncorrstrttm~the spacecraft.  The difference between the START_TIME and
  uncorrected_start_time~uncorrstrttm~the UNCORRECTED_START_TIME is the estimated correction that
  uncorrected_start_time~uncorrstrttm~was applied to the START_TIME during ground processing.
  uneven_bit_weight_corr_flag~unevnbtflag~The uneven_bit_weight_corr_flag element is used to indicate
  uneven_bit_weight_corr_flag~unevnbtflag~whether a correction has been applied to adjust for uneven
  uneven_bit_weight_corr_flag~unevnbtflag~bit weighting of the analog-to-digital converter. In image
  uneven_bit_weight_corr_flag~unevnbtflag~processing, the correction is applied to every pixel in an
  uneven_bit_weight_corr_flag~unevnbtflag~image.
  unit~unit~The unit element provides the full name or standard
  unit~unit~abbreviation of a unit of measurement in which a value is
  unit~unit~expressed.  Example values: square meter, meter per second.
  unit~unit~NULL
  unit~unit~Note:  A table of standard units representing those
  unit~unit~published by the Systeme Internationale appears in the
  unit~unit~'Units of Measurement' section of the PSDD.  (Please refer
  unit~unit~to the table of contents for its location.)  The values
  unit~unit~in this table's 'Unit Name' column constitute the standard
  unit~unit~values for the data element UNIT.
  unit_id~unitid~The unit_id element indicates the common abbreviation or
  unit_id~unitid~symbol for a unit of measure.  Example:  The unit KILOGRAM
  unit_id~unitid~has the unit_id 'kg'.
  unit_id~unitid~Note:  A table of standard units, unit ids, and measured
  unit_id~unitid~quantities including those published by the Systeme
  unit_id~unitid~Internationale appears in the 'Units of Measurement'
  unit_id~unitid~section of the PSDD.  (Please refer to the table of contents
  unit_id~unitid~for its location.)  The values in this table's 'Symbol'
  unit_id~unitid~column constitute the standard values for the data element
  unit_id~unitid~unit_id.
  unknown_constant~unknownconst~The unknown_constant element supplies the numeric value
  unknown_constant~unknownconst~used to represent the figurative constant 'UNK'. 'UNK'
  unknown_constant~unknownconst~(Unknown) is defined as indicating when values for a
  unknown_constant~unknownconst~particular data element in a specific instance is
  unknown_constant~unknownconst~permanently not known.
  upload_id~uploadid~The upload_id element describes a spacecraft command set
  upload_id~uploadid~that is associated with the given data product.
  usage_note~usagenote~The usage_note element provides the information about the
  usage_note~usagenote~use of a particular data element or object within a
  usage_note~usagenote~particular context.
  user_product_id~userprodid~The user_product_id element provides an
  user_product_id~userprodid~alternate logical file name constructed according to a
  user_product_id~userprodid~producer-defined naming convention.
  valid_maximum~validmax~The valid_maximum data element represents the maximum value
  valid_maximum~validmax~that is valid for a data object.  Valid_minimum and valid_
  valid_maximum~validmax~maximum define the valid range of values for a data object,
  valid_maximum~validmax~such as -90 to 90 for a column object containing latitude
  valid_maximum~validmax~values.
  valid_maximum~validmax~Note:  this element should appear in labels only between
  valid_maximum~validmax~the 'OBJECT =' and 'END_OBJECT=' lines of an object with a
  valid_maximum~validmax~specific data type.
  valid_minimum~validmin~The valid_minimum data element represents the minimum value
  valid_minimum~validmin~that is valid for a data object.  Valid_minimum and valid_
  valid_minimum~validmin~maximum define the valid range of values for a data object,
  valid_minimum~validmin~such as -90 to 90 for a column object containing latitude
  valid_minimum~validmin~values.
  valid_minimum~validmin~Note:  this element should appear in labels only between
  valid_minimum~validmin~the 'OBJECT =' and 'END_OBJECT=' lines of an object with a
  valid_minimum~validmin~specific data type.
  vector_component_1~vectcomp1~The vector_component_1 element provides the magnitude of
  vector_component_1~vectcomp1~the first component of a vector.
  vector_component_1~vectcomp1~The particular vector component being measured is
  vector_component_1~vectcomp1~identified by the vector_component_id_1
  vector_component_1~vectcomp1~element.
  vector_component_2~vectcomp2~The vector_component_2 element provides the magnitude of
  vector_component_2~vectcomp2~the second component of a vector.
  vector_component_2~vectcomp2~The particular vector component being measured is
  vector_component_2~vectcomp2~identified by the vector_component_id_2
  vector_component_2~vectcomp2~element.
  vector_component_3~vectcomp3~The vector_component_3 element provides the magnitude of
  vector_component_3~vectcomp3~the third component of a vector.
  vector_component_3~vectcomp3~The particular vector component being measured is
  vector_component_3~vectcomp3~identified by the vector_component_id_3
  vector_component_3~vectcomp3~element.
  vector_component_id~vectcompid~The vector_component_id element identifies a
  vector_component_id~vectcompid~vector component without reference to a particular vector
  vector_component_id~vectcompid~component value.
  vector_component_id_1~vectcompid1~The vector_component_id_1 element identifies
  vector_component_id_1~vectcompid1~the first component of a vector.
  vector_component_id_1~vectcompid1~The magnitude of the first component of the vector is
  vector_component_id_1~vectcompid1~provided by the vector_component_1 element.
  vector_component_id_1~vectcompid1~Example value:  RJ\$ (a radial distance).
  vector_component_id_2~vectcompid2~The vector_component_id_2 element identifies
  vector_component_id_2~vectcompid2~the second component of a vector.
  vector_component_id_2~vectcompid2~The magnitude of the second component of the vector is
  vector_component_id_2~vectcompid2~provided by the vector_component_2 element.
  vector_component_id_2~vectcompid2~Example value:  LATJ\$S3 (a latitude).
  vector_component_id_3~vectcompid3~The vector_component_id_3 element identifies
  vector_component_id_3~vectcompid3~the third component of a vector.
  vector_component_id_3~vectcompid3~The magnitude of the third component of the vector is
  vector_component_id_3~vectcompid3~provided by the vector_component_3 element.
  vector_component_id_3~vectcompid3~Example value:  LONJ\$S3 (a longitude).
  vector_component_type_desc~vectcomptypd~The vector_component_type_desc provides a
  vector_component_type_desc~vectcomptypd~general description of a particular vector component
  vector_component_type_desc~vectcomptypd~type.
  vector_component_type~vectcomptype~The vector_component_type element identifies the type of
  vector_component_type~vectcomptype~information which is provided by a particular vector
  vector_component_type~vectcomptype~component identification element.
  vector_component_type~vectcomptype~Example values:  LATITUDE, LONGITUDE, VELOCITY.
  vector_component_unit~vectcompunit~The vector_component_unit element specifies the unit of
  vector_component_unit~vectcompunit~measure of associated dataset or sampling parameters.
  vector_component_unit~vectcompunit~For example, in the ring information entity the unit
  vector_component_unit~vectcompunit~element specifies that a given set of ring radii are
  vector_component_unit~vectcompunit~measured in kilometers.
  version_id~versionid~This element is an alias for product_version_id used only by
  version_id~versionid~AMMOS-MGN ephemeris files.
  version_number~versionnum~The version_number element is defined as an alias for
  version_number~versionnum~product_version_id and is available only for AMMOS-Magellan
  version_number~versionnum~mission operations products.
  vertical_fov~vertfov~The vertical_field_of_view element provides the angular
  vertical_fov~vertfov~measure of the vertical field of view of an instrument.
  vertical_framelet_offset~vertframeoff~The vertical_framelet_offset element provides the column
  vertical_framelet_offset~vertframeoff~number of a framelet within a tiled image.  In the PDS,
  vertical_framelet_offset~vertframeoff~offsets are counted from one.
  vertical_pixel_fov~vertpixfov~The vertical_pixel_field_of_view element provides the
  vertical_pixel_fov~vertpixfov~angular measure of the vertical field of view of a single
  vertical_pixel_fov~vertpixfov~pixel.
  vertical_pixel_scale~vertpxlscal~The VERTICAL_PIXEL_SCALE element indicates the vertical
  vertical_pixel_scale~vertpxlscal~picture scale.
  volume_insert_text~volinserttxt~The volume_insert_text element provides a text field to be
  volume_insert_text~volinserttxt~included on the volume insert.  The text field should
  volume_insert_text~volinserttxt~identify the data products or data sets included on the
  volume_insert_text~volinserttxt~volume.  The text field should consist of 8 or fewer lines of
  volume_insert_text~volinserttxt~text where each line is no more than 60 characters wide.
  volume_desc~volumedesc~ The volume_desc element describes the content and type of
  volume_desc~volumedesc~data contained in the volume.
  volume_format~volumeformat~The volume_format element identifies the logical format
  volume_format~volumeformat~used in writing a data volume, such as ANSI, TAR, or BACKUP
  volume_format~volumeformat~for tape volumes and ISO-9660, HIGH-SIERRA, for CD-ROM
  volume_format~volumeformat~volumes.
  volume_id~volumeid~The volume_id element provides a unique identifier for a
  volume_id~volumeid~data volume.  Example: MG_1001.
  volume_name~volumename~The volume_name element contains the name of a data volume.
  volume_name~volumename~ In most cases the volume_name is more specific than the
  volume_name~volumename~volume_set_name.  For example, the volume_name for the
  volume_name~volumename~first volume in the VOYAGER IMAGES OF URANUS volume set is:
  volume_name~volumename~Volume 1: Compressed Images 24476.54 - 26439.58
  volumes~volumes~The volumes element provides the number of physical data
  volumes~volumes~volumes contained in a volume set.  Note: In the PDS,
  volumes~volumes~volumes represents the total number of related data volumes
  volumes~volumes~that comprise a single orderable unit, as represented by
  volumes~volumes~the volume_set_id.  For example, the volume set VOYAGER
  volumes~volumes~IMAGES OF URANUS has the volume_set_id of
  volumes~volumes~USA_NASA_PDS_VG_0001_TO_VG_0003 and the value for volumes
  volumes~volumes~would be 3.
  volume_series_name~volumesernm~The volume_series_name element provides a full, formal name
  volume_series_name~volumesernm~that describes a broad categorization of data products or
  volume_series_name~volumesernm~data sets related to a planetary body or a research
  volume_series_name~volumesernm~campaign (e.g. International Halley Watch).  A volume
  volume_series_name~volumesernm~series consists of one or more volume sets that represent
  volume_series_name~volumesernm~data from one or more missions or campaigns.  For example,
  volume_series_name~volumesernm~the volume series MISSION TO VENUS consists of the
  volume_series_name~volumesernm~following three volume sets:
  volume_series_name~volumesernm~MAGELLAN:    THE MOSAIC IMAGE DATA RECORD
  volume_series_name~volumesernm~MAGELLAN:    THE ALTIMETRY AND RADIOMETRY DATA RECORD
  volume_series_name~volumesernm~PRE-MAGELLAN RADAR AND GRAVITY DATA SET COLLECTION
  volume_set_id~volumesetid~The volume_set_id element identifies a data volume or a set
  volume_set_id~volumesetid~of volumes.  Volume sets are normally considered as a
  volume_set_id~volumesetid~single orderable entity. Examples: USA_NASA_PDS_MG_1001,
  volume_set_id~volumesetid~USA_NASA_PDS_GR_0001_TO_GR_0009
  volume_set_name~volumesetnm~The volume_set_name element provides the full, formal name
  volume_set_name~volumesetnm~of one or more data volumes containing a single data set or
  volume_set_name~volumesetnm~a collection of related data sets.  Volume sets are
  volume_set_name~volumesetnm~normally considered as a single orderable entity.  For
  volume_set_name~volumesetnm~example, the volume series MISSION TO VENUS consists of the
  volume_set_name~volumesetnm~following three volume sets:
  volume_set_name~volumesetnm~MAGELLAN:    THE MOSAIC IMAGE DATA RECORD
  volume_set_name~volumesetnm~MAGELLAN:    THE ALTIMETRY AND RADIOMETRY DATA RECORD
  volume_set_name~volumesetnm~PRE-MAGELLAN RADAR AND GRAVITY DATA SET COLLECTION
  volume_set_name~volumesetnm~In certain cases, the volume_set_name can be the same as
  volume_set_name~volumesetnm~the volume_name, such as when the volume_set consists of
  volume_set_name~volumesetnm~only one volume.
  volume_sets~volumesets~ The volume_sets element provides the number of volume sets
  volume_sets~volumesets~in a volume series.  For example, there are currently six
  volume_sets~volumesets~(6) volume sets associated with the volume series MISSION
  volume_sets~volumesets~TO VENUS.
  volume_version_id~volumeverid~The volume_version_id element indentifies the version of a
  volume_version_id~volumeverid~data volume.  All original volumes should use a
  volume_version_id~volumeverid~volume_version_id of 'Version 1'.  Versions are used when
  volume_version_id~volumeverid~data products are remade due to errors or limitations in
  volume_version_id~volumeverid~the original volumes (test volumes, for example), and the
  volume_version_id~volumeverid~new version makes the previous volume obsolete.
  volume_version_id~volumeverid~Enhancements or revisions to data products which constitute
  volume_version_id~volumeverid~alternate data products should be assigned a unique volume
  volume_version_id~volumeverid~id, not a new version id. Examples: Version 1, Version 2.
  wavelength~wavelength~ The wavelength element identifies the mean wavelength to
  wavelength~wavelength~which an instrument detector/filter combination is
  wavelength~wavelength~sensitive.
  westernmost_longitude~wstrnmostlon~The following definitions describe westernmost longitude for the
  westernmost_longitude~wstrnmostlon~body-fixed, rotating coordinate systems:
  westernmost_longitude~wstrnmostlon~ 
  westernmost_longitude~wstrnmostlon~For Planetocentric coordinates and for Planetographic coordinates in
  westernmost_longitude~wstrnmostlon~which longitude increases toward the east, the westernmost (leftmost)
  westernmost_longitude~wstrnmostlon~longitude of a spatial area (e.g.,a map, mosaic, bin,feature or region)
  westernmost_longitude~wstrnmostlon~is the minimum numercial value of longitude unless it crosses the
  westernmost_longitude~wstrnmostlon~Prime Meridian.
  westernmost_longitude~wstrnmostlon~ 
  westernmost_longitude~wstrnmostlon~For Planetographic coordinates in which longitude increases toward the
  westernmost_longitude~wstrnmostlon~west (prograde rotator), the westernmost (leftmost) longitude of a
  westernmost_longitude~wstrnmostlon~spatial area (e.g., a map,mosaic, bin, feature or region) is the maximum
  westernmost_longitude~wstrnmostlon~numerical value of longitude unless it crosses the Prime Meridian.
  westernmost_longitude~wstrnmostlon~ 
  westernmost_longitude~wstrnmostlon~For the Earth, Moon and Sun, PDS also supports the traditional use of
  westernmost_longitude~wstrnmostlon~the range (-180,180) in which case the westernmost (leftmost) longitude
  westernmost_longitude~wstrnmostlon~is the maximum numerical value of longitude unless it crosses 180.