Identification_Information:
  Citation:
    Citation_Information:
      Originator:
        United States Department of Agriculture, National Agricultural
        Statistics Service, Research and Development Division, Geospatial
        Information Branch, Area Frame Section
      Publication_Date: 2001
      Title: Stratification of Iowa 1989
      Publication_Information:
        Publication_Place: Fairfax, Virginia
        Publisher:
          U.S. Department of Agriculture, National Agricultural
          Statistics Service
      Online_Linkage: <http://www.nass.usda.gov/Research_and_Science/>
  Description:
    Abstract:
      The United States Department of Agriculture (USDA), National
      Agricultural Statistics Service (NASS) area sampling frame is a
      delineation of all parcels of land for the purpose of later sampling the
      parcels.  The area frame is constructed by visually interpreting satellite
      imagery to divide a state into homogenous land use areas (strata) based
      on percent cultivated.  The strata are typically defined as low, medium or
      high percent cultivated, non-agricultural land, urban use, agri-urban, or
      water.  The boundaries of the strata usually follow identifiable features
      such as roads, railroads and waterways.  The strata boundaries do not
      coincide with any political boundaries, with the exception of state
      boundaries.
    Purpose:
      These data are intended for geographic display and analysis at the state
      level.  The data should be displayed and analyzed at a scale of
      1:100,000 or smaller (e.g., 1:250,000, etc.).  The strata data are
      provided "as is".  USDA/NASS does not warrant results you may obtain
      using the strata data.
    Supplemental_Information: N/A
  Time_Period_of_Content:
    Time_Period_Information:
      Multiple_Dates/Times:
        Single_Date/Time:
          Calendar_Date: 2001
        Single_Date/Time:
          Calendar_Date: 1989
    Currentness_Reference:
      2001:  Publication date and modification of strata boundaries.
      1989:  Creation of original area sampling frame strata boundaries
  Status:
    Progress: Complete
    Maintenance_and_Update_Frequency: Irregular
  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: -96.64
      East_Bounding_Coordinate: -90.14
      North_Bounding_Coordinate: 43.50
      South_Bounding_Coordinate: 43.38
  Keywords:
    Theme:
      Theme_Keyword_Thesaurus:
        National Agricultural Statistics Service, U.S. Department of
        Agriculture, 1987, Area Frame Design for Agricultural Surveys,
        Washington, D.C., NASS/USDA.
      Theme_Keyword: Stratification
      Theme_Keyword: Area sampling frame
      Theme_Keyword: Land use classes (strata)
    Place:
      Place_Keyword_Thesaurus:
        U.S. Department of Commerce, 1987, Codes for the Identification of the
        States, the District of Columbia and the Outlying Areas of The United
        States, and Associated Areas (Federal Information Processing Standard
        5-2):  Washington, D.C., National Institute of Standards and Technology.
      Place_Keyword: United States
      Place_Keyword: USA
      Place_Keyword: Iowa
  Access_Constraints: None
  Use_Constraints:
    None.  Acknowledgment of the U.S. Department of Agriculture, National
    Agricultural Statistics Service would be appreciated in products derived
    from these data.
  Point_of_Contact:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: Area Frame Section staff
        Contact_Organization: USDA/NASS/RDD/AFS
      Contact_Address:
        Address_Type: mailing address
        Address: 1400 Independence Ave SW, Room 6034
        City: Fairfax
        State_or_Province: VA
        Postal_Code: 22030
      Contact_Voice_Telephone: 703-235-1971
      Contact_Electronic_Mail_Address: HQ_RD_OD@nass.usda.gov
  Data_Set_Credit: Area Frame Section staff
  Native_Data_Set_Environment:
    Environmental Systems Research Institute ArcView 3.1 shapefile, Microsoft
    Windows NT.


Data_Quality_Information:
  Logical_Consistency_Report: No checks for topological consistency were performed on this data set.
  Completeness_Report:
    There are no known gaps or missing data.  This data set includes the area in
    square miles and number of acres for each strata.  Because the area sampling
    frame strata boundaries are modified (i.e., not a new area sampling frame),
    the boundaries may not be coincident with strata boundaries of adjacent
    states.
  Positional_Accuracy:
    Horizontal_Positional_Accuracy:
      Horizontal_Positional_Accuracy_Report:
        The sources used for digitizing strata boundaries are 1:100,000 scale
        Digital Raster Graphics
      Quantitative_Horizontal_Positional_Accuracy_Assessment:
        Horizontal_Positional_Accuracy_Value: 5.0
        Horizontal_Positional_Accuracy_Explanation: N/A
  Lineage:
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: U.S. Geologic Survey (USGS)
          Publication_Date: 1957 - 1985
          Title: USGS Topographic Quadrangles
          Publication_Information:
            Publication_Place: Reston, VA
            Publisher: U.S. Geologic Survey
      Source_Scale_Denominator: 24000
      Type_of_Source_Media: Paper
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Range_of_Dates/Times:
            Beginning_Date: 1952
            Ending_Date: 1983
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: TopoQuad24
      Source_Contribution: spatial and attribute information
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: U.S. Geologic Survey (USGS)
          Publication_Date: 1984 - 1987
          Title: USGS Topographic Quadrangles
          Publication_Information:
            Publication_Place: Reston, VA
            Publisher: U.S. Geologic Survey
      Source_Scale_Denominator: 100000
      Type_of_Source_Media: Paper
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Range_of_Dates/Times:
            Beginning_Date: 1963
            Ending_Date: 1986
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: TopoQuad100
      Source_Contribution: spatial and attribute information
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: EOSAT (Space Imaging)
          Publication_Date: 1985 - 1987
          Title: Landsat imagery
          Publication_Information:
            Publication_Place: Lanham, MD
            Publisher: EOSAT (Space Imaging)
      Source_Scale_Denominator: 250000
      Type_of_Source_Media: Paper
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Range_of_Dates/Times:
            Beginning_Date: 1985
            Ending_Date: 1987
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: TMpaper
      Source_Contribution: spatial and attribute information
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: National High Altitude Photography (NHAP)
          Publication_Date: 1981 - 1985
          Title: NHAP aerial photographs
          Publication_Information:
            Publication_Place: Salt Lake City, UT
            Publisher: Aerial Photography Field Office (APFO)
      Source_Scale_Denominator: 58000
      Type_of_Source_Media: black and white aerial photograph
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Range_of_Dates/Times:
            Beginning_Date: 1981
            Ending_Date: 1985
        Source_Currentness_Reference: source photography date
      Source_Citation_Abbreviation: NHAPairphoto
      Source_Contribution: spatial and attribute information
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: U.S. Bureau of the Census
          Publication_Date: 2000
          Title: TIGER digital vector files
          Publication_Information:
            Publication_Place: Redlands, CA
            Publisher: Environmental Systems Research Institute, Inc.
      Type_of_Source_Media: online
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Single_Date/Time:
            Calendar_Date: 2000
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: TIGER
      Source_Contribution: spatial and attribute information
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: U.S. Geologic Survey (USGS)
          Publication_Date: 1996 - 1998
          Title: USGS Topographic Digital Raster Graphics
          Publication_Information:
            Publication_Place: Sioux Falls, SD
            Publisher: U.S. Geologic Survey
      Source_Scale_Denominator: 100000
      Type_of_Source_Media: online
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Range_of_Dates/Times:
            Beginning_Date: 1978
            Ending_Date: 1993
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: TopoDRG
      Source_Contribution: spatial and attribute information
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: U.S. Bureau of the Census
          Publication_Date: 1989
          Title: 1987 Census of Agriculture Advance County Reports
          Publication_Information:
            Publication_Place: Washington, DC
            Publisher: NASS/USDA
      Type_of_Source_Media: Paper
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Single_Date/Time:
            Calendar_Date: 1987
        Source_Currentness_Reference: census date
      Source_Citation_Abbreviation: AgCensus87
      Source_Contribution: attribute information
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: National Agricultural Statistics Service
          Publication_Date: 1987
          Title: Area Frame Design for Agricultural Surveys
          Publication_Information:
            Publication_Place: Washington, DC
            Publisher: NASS/USDA
      Type_of_Source_Media: Paper
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Single_Date/Time:
            Calendar_Date: 1987
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: AFSpaper
      Source_Contribution: attribute information
    Process_Step:
      Process_Description:
        The area sampling frame for Iowa was constructed for use in 1989 and
        was based on USGS 1:24,000 and 1:100,000 scale topographic maps,
        1:250,000 scale hardcopy Landsat imagery, 1:58,000 scale NHAP
        aerial photographs, and 1987 Agricultural Census data.  The boundaries
        were modified in 2001 to conform to USGS 1:100,000 scale topographic
        digital raster graphics and digital line graph files.  Individual county
        files were merged into single state file.  The coordinates for the
        strata polygons are unprojected to geographic latitude and longitude
        (decimal degrees).  The spatial data file format is Environmental
        Systems Research Institute's ArcView shapefile format.
      Source_Used_Citation_Abbreviation: TopoQuad24
      Source_Used_Citation_Abbreviation: TopoQuad100
      Source_Used_Citation_Abbreviation: TMpaper
      Source_Used_Citation_Abbreviation: NHAPairphoto
      Source_Used_Citation_Abbreviation: TIGER
      Source_Used_Citation_Abbreviation: TopoDRG
      Source_Used_Citation_Abbreviation: AgCensus87
      Source_Used_Citation_Abbreviation: AFSpaper
      Process_Date: 1989, 2001


    Process_Step:
      Process_Description:
        The shapefile was checked and edited for topology in 2004.  Gaps and overlaps
        were corrected within and ESRI personal geodatabase.
      Process_Date: 2004
Spatial_Data_Organization_Information:
  Indirect_Spatial_Reference:
    U.S. Department of Commerce, 1990, Counties and Equivalent
    Entities of The United States, Its Possessions, and
    Associated Areas (Federal Information Processing Standard
    6-4): Washington, D.C.  National Institute of Standards and
    Technology.
  Direct_Spatial_Reference_Method: Vector
  Point_and_Vector_Object_Information:
    SDTS_Terms_Description:
      SDTS_Point_and_Vector_Object_Type: G-Polygon
      Point_and_Vector_Object_Count: 8869 (prior to dissolving boundaries)


Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition:
    Planar:
      Grid_Coordinate_System:
        Grid_Coordinate_System_Name: Universal Transverse Mercator
        Universal_Transverse_Mercator:
          UTM_Zone_Number: 15
          Transverse_Mercator:
            Scale_Factor_at_Central_Meridian: 0.9996
            Longitude_of_Central_Meridian: -93.00
            Latitude_of_Projection_Origin: 0.0
            False_Easting: 500000.00
            False_Northing: 0.0
      Planar_Coordinate_Information:
        Planar_Coordinate_Encoding_Method: row and column
        Coordinate_Representation:
          Abscissa_Resolution: 30
          Ordinate_Resolution: 30
        Planar_Distance_Units: meters
    Geodetic_Model:
      Horizontal_Datum_Name: North American Datum of 1983
      Ellipsoid_Name: Geodetic Reference 80
      Semi-major_Axis: 6378137.00
      Denominator_of_Flattening_Ratio: 298.257
Entity_and_Attribute_Information:
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: Land Use Strata
      Entity_Type_Definition: Homogeneous land use area based on percent cultivated
      Entity_Type_Definition_Source:
        U.S. Department of Agriculture, National Agricultural Statistics
        Service
    Attribute:
      Attribute_Label: Strata
      Attribute_Definition: Land use category based on percent cultivated
      Attribute_Definition_Source:
        U.S. Department of Agriculture, National Agricultural Statistics
        Service
      Attribute_Domain_Values:
        Enumerated_Domain:
          Enumerated_Domain_Value: 13
          Enumerated_Domain_Value_Definition:
            > 75% cultivated, (cultivated categories consist of land used for
            crops, the remaining portion of land in the cultivated strata may
            include pasture, woods, waste, rangeland, etc.)
          Enumerated_Domain_Value_Definition_Source:
            "2001 Area Frame Design Information, Implementation Years of
            Current NASS Area Frames", NASS Area Frame Section, March 2001.
        Enumerated_Domain:
          Enumerated_Domain_Value: 20
          Enumerated_Domain_Value_Definition:
            25%-75% cultivated, (cultivated categories consist of land used for
            crops, the remaining portion of land in the cultivated strata may
            include pasture, woods, waste, rangeland, etc.)
          Enumerated_Domain_Value_Definition_Source:
            "2001 Area Frame Design Information, Implementation Years of
            Current NASS Area Frames", NASS Area Frame Section, March 2001.
        Enumerated_Domain:
          Enumerated_Domain_Value: 31
          Enumerated_Domain_Value_Definition:
            Agri-urban with > 100 homes per square mile (less than 15%
            cultivated)
          Enumerated_Domain_Value_Definition_Source:
            "2001 Area Frame Design Information, Implementation Years of
            Current NASS Area Frames", NASS Area Frame Section, March 2001.
        Enumerated_Domain:
          Enumerated_Domain_Value: 32
          Enumerated_Domain_Value_Definition:
            Commercial/dense urban with > 100 homes per square mile (city center
            with 0% cultivated)
          Enumerated_Domain_Value_Definition_Source:
            "2001 Area Frame Design Information, Implementation Years of
            Current NASS Area Frames", NASS Area Frame Section, March 2001.
        Enumerated_Domain:
          Enumerated_Domain_Value: 40
          Enumerated_Domain_Value_Definition:
            < 25% cultivated, (cultivated categories consist of land used for
            crops, the remaining portion of land in the cultivated strata may
            include pasture, woods, waste, rangeland, etc.)
          Enumerated_Domain_Value_Definition_Source:
            "2001 Area Frame Design Information, Implementation Years of
            Current NASS Area Frames", NASS Area Frame Section, March 2001.
        Enumerated_Domain:
          Enumerated_Domain_Value: 50
          Enumerated_Domain_Value_Definition: Non-agricultural (state or national parks, military bases, etc.)
          Enumerated_Domain_Value_Definition_Source:
            "2001 Area Frame Design Information, Implementation Years of
            Current NASS Area Frames", NASS Area Frame Section, March 2001.
        Enumerated_Domain:
          Enumerated_Domain_Value: 62
          Enumerated_Domain_Value_Definition: Water
          Enumerated_Domain_Value_Definition_Source:
            "2001 Area Frame Design Information, Implementation Years of
            Current NASS Area Frames", NASS Area Frame Section, March 2001.
    Attribute:
      Attribute_Label: Sum_area
      Attribute_Definition: The stratum area in square miles.
      Attribute_Definition_Source:
        U.S. Department of Agriculture, National Agricultural Statistics
        Service
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 47.7840 (actual value, not range)
          Range_Domain_Maximum: 43154.8810 (actual value, not range)
    Attribute:
      Attribute_Label: Sum_acres
      Attribute_Definition: The number of acres in a stratum.
      Attribute_Definition_Source:
        U.S. Department of Agriculture, National Agricultural Statistics
        Service
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 30579.8720 (actual value, not range)
          Range_Domain_Maximum: 27619124.8970 (actual value, not range)


Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: USDA/NASS/RDD
      Contact_Address:
        Address_Type: mailing address
        Address: 1400 Independence Ave SW, Room 6034
        City: Fairfax
        State_or_Province: VA
        Postal_Code: 22030
      Contact_Voice_Telephone: 703-235-1971
      Contact_Instructions: N/A
  Distribution_Liability:
    Users of the strata data are solely responsible for interpretations made
    from the product.  The strata data are provided "as is".  USDA/NASS does
    not warrant results you may obtain by using the strata data.  Feel free to
    contact our staff at (HQ_RD_OD@nass.usda.gov) if technical questions arise
    in the use of the strata data.
  Standard_Order_Process:
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: ESRI Shapefile
      Digital_Transfer_Option:
        Online_Option:
          Computer_Contact_Information:
            Network_Address:
              Network_Resource_Name: <http://www.nass.usda.gov/Research_and_Science/>
    Fees: There is no charge for the online option.
    Ordering_Instructions: N/A


Metadata_Reference_Information:
  Metadata_Date: 20040727
  Metadata_Contact:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: Lee Plowman
        Contact_Organization: USDA/NASS/RDD
      Contact_Address:
        Address_Type: mailing address
        Address: 1400 Independence Ave SW, Room 6034
        City: Fairfax
        State_or_Province: VA
        Postal_Code: 22030
      Contact_Voice_Telephone: 703-235-1971
      Contact_Electronic_Mail_Address: HQ_RD_OD@nass.usda.gov
  Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
  Metadata_Standard_Version: FGDC-STD-001-1998
  Metadata_Security_Information:
    Metadata_Security_Classification_System: None
    Metadata_Security_Classification: Unclassified
    Metadata_Security_Handling_Description: None