> **[Format Specifications For LVL Data Collection File]{.underline}**
>
> Record Sequence:

Each days running should begin with an Instrument record. Should the
rods or instrument change during the day, a new Instrument record must
be created.

Next, a collimation record must be made. Should the collimation change,
or should a new instrument be used during the day, a new collimation
record must be created.

To begin a section, a Beginning record must be created.

Observations from each instrument set-up during a section running are
recorded in a set-up record.

When a section is completed, record all ending information using the End
leveling record. Should the running be aborted, or later rejected later,
place an 'F' in col 89 for field rejection.

> Format Key
>
> a -- alpha-numeric
>
> n - numeric
>
> yy - year
>
> mm - month
>
> dd - day of year
>
> **Instrument Record -- I**
>
> Example:
>
> 12345678901234567890123456789012345678901234567890123456789012345678901234567890
>
> I 246 103252 100 F 397 12975 397 12976 CM 2.00 C A 2 1
>
> Fields:
>
> [Column]{.underline} [Name]{.underline} [Format]{.underline}
> [Range]{.underline} [Example]{.underline}
>
> 1 Record Type a I I
>
> 3-5 Instrument Code nnn 242,243,244 243
>
> 7-14 Inst. Serial Num. aaaaaaaa alpha-numeric 103252
>
> 16-18 Inst Stadia Factor nnn 100 to 600 100
>
> 20 Inst Stadia Code F,H F,H F
>
> 22-24 Rod 1 Code nnn 300-399 397
>
> 26-33 Rod 1 Serial Num. nnnnnnnn alpha-numeric 12975
>
> 35-40 Rod 1 Constant nnnnnn 0-999.99 0
>
> 42-44 Rod 2 Code nnn 300-399 397
>
> 46-53 Rod 2 Serial Num. nnnnnnnn alpha-numeric 12976
>
> 55-60 Rod 2 Constant nnnnnn 0-999.99 0
>
> 62-63 Rod Units aa CM or MT CM
>
> 65-68 Height of Probe nn.n 0\<\>2 2.00
>
> 70 Temp Scale C,F C,F C
>
> 72 Time Zone a see below A
>
> 74 Order n 1,2,3 2
>
> 76 Class n 0,1,2 1
>
> Instrument Code -- NGS defined code for specific instrument. Choices
> are limited to codes for three manufacturers, Topcon, Wild/Leica, and
> Zeiss/Trimble.
>
> The current codes are:

242 - Leica NA2002

243 - Leica NA3000, NA3003, DNA03

244 -- Topcon DL-101

245 -- Topcon DL102C

246 -- Zeiss -- All

> Instrument Serial Number -- Serial number stored digitally within
> leveling instrument or written on instrument.
>
> Instrument Stadia Factor -- Determined by instrument type and defined
> in INST.DAT
>
> Instrument Stadia Code -- H for Half, F for Full
>
> Rod 1 Code -- NGS specified code. Defined in RODS.DAT based on rod
> serial number.
>
> Rod 1 Serial Number -- Manufacturer specified. Written on rod.
>
> Rod 1 Constant -- Zero for digital levels
>
> Rod 2 Code -- NGS specified code. Refer to Bluebook Annex F
>
> Rod 2 Serial Number -- Manufacturer specified. Written on rod.
>
> Rod 2 Constant -- Zero for digital levels
>
> Rod Units -- Centimeter or Meter
>
> Temperature Scale -- Celsius or Fahrenheit
>
> Time Zone -- Based on US Navy Time Zone Designations:
>
> Atlantic -- Q
>
> Eastern -- R
>
> Central -- S
>
> Mountain -- T
>
> Pacific -- U
>
> Yukon -- V
>
> AK/HI -- W
>
> GMT - Z
>
> Order and Class -- Valid combinations: 11,12,21,22,30
>
> **Collimation Record -- C**
>
> Example:
>
> 12345678901234567890123456789012345678901234567890123456789012345678901234567890
>
> C 246 103252 0927 050819 0.047 30.5 C
>
> Fields:
>
> [Column]{.underline} [Name]{.underline} [Format]{.underline}
> [Range]{.underline} [Example]{.underline}
>
> 1 Record Type a C C
>
> 3-5 Instrument Code nnn 242,243,244 243
>
> 7-14 Inst. Serial Num. aaaaaaaa alpha-numeric 103252
>
> 16-19 Time hhmm 0927
>
> 21-26 Date yymmdd 050819
>
> 28-33 Collimation sn.nnn -0.050-0.050 0.047
>
> 35 Collimation Y,N \<blank\> Y,N, \<blank\> \<blank\>
>
> 37-41 Collimation Temp. nnn.n 030.5
>
> 43 Temperature Units C,F C,F C
>
> 45-80 Comments a/n
>
> Collimation - The maximum collimation error for single line of sight
> is 0.05 mm/m for all order and class except third order which is 0.10
> mm/m. The maximum collimation error for reversible compensator-type
> instruments, mean of two lines of sight is 0.02 mm/m for all order and
> class except third order which is 0.04 mm/m.
>
> **Beginning Section Record -- B**
>
> Example:
>
> 12345678901234567890123456789012345678901234567890123456789012345678901234567890
>
> B FWM FWM 8 A 197 30.6 1 1 0927 050819 1 2.0 0.2 0.5 O
>
> Fields:
>
> [Column]{.underline} [Name]{.underline} [Format]{.underline}
> [Range]{.underline} [Example]{.underline}
>
> 1 Record Type a B B
>
> 3-5 Observer Initials aaa 2-3 char FWM
>
> 7-9 Recorder Initials aaa 2-3 char GWA
>
> 11-14 Survey Point Num nnnn 1-9999 8
>
> 16-41 Mark Designation a/n A 197
>
> 43-46 Temperature nnn.n 30.6
>
> 48 Wind Code n 0,1,2 1
>
> 50 Sun Code n 0,1,2 1
>
> 52-55 Time hhmm 0927
>
> 57-62 Date yymmdd 050819
>
> 64 Rod On Mark n 1,2 1
>
> 66-69 Height Of Inst n.nn 1.0\<\>3.0 2.0
>
> 71-73 Lower Probe Ht. n.n 0.2
>
> 75-77 Upper Probe Ht. n.n 0.5
>
> 79 (P)redicted/ P,O P,O O
>
> (O)bserved Temps
>
> Survey Point Number -- User defined numeric identifier of the starting
> benchmark.
>
> Designation -- alpha-numeric description of the benchmark
>
> Rod On Mark -- Rod that is on the mark. Important to ensure that NGS
> requirement of an even number of setups is followed
>
> Probe Ht -- Height of the temperature probe on the tripod
>
> (P)redicted/(O)bserved Temps -- Defines whether temperatures were
> recorded or predicted
>
> **Setup Record -- S**
>
> Example:
>
> 12345678901234567890123456789012345678901234567890123456789012345678901234567890
>
> S 1 1.32111 2 0.00 14.13 0.77597 2 0.00 14.05 31.0 30.6
>
> Fields:
>
> [Column]{.underline} [Name]{.underline} [Format]{.underline}
> [Range]{.underline} [Example]{.underline}
>
> 1 Record Type a S S
>
> 3-4 Setup Number nn 1-99 1
>
> 6-12 BS Rod Reading n.nnnnn 1.32111
>
> 14-15 Num. Measurements nn 2
>
> 17-20 Setup Imbalance (mm) n.nnn 2.0--10.0 0.00
>
> 22-26 BS Distance (m) nn.nn \<90.0 14.13
>
> 28-34 FS Rod Reading n.nnnnn 0.77597
>
> 36-37 Num. Measurements nn 2
>
> 39-42 Total Imbalance (mm) n.nnn 4.0-10.0 0.00
>
> 44-48 FS Distance (m) nn.nn \<90.0 14.05
>
> 50-54 Lower Probe Temp. nnn.n 31.0
>
> 56-60 Upper Probe Temp. nnn.n 30.6
>
> 62-90 Comments a/n
>
> Setup Imbalance -- Computed difference in the foresight and backsight
> distance of the setup
>
> Total Imbalance -- Computed difference in the foresight and backsight
> distance of the section
>
> Num. Measurements -- The number of measurements the instrument takes
> continuously to determine the rod reading. Defined within instrument
> settings
>
> **Ending Record -- E**
>
> Example:
>
> 12345678901234567890123456789012345678901234567890123456789012345678901234567890123456
>
> E 9 RENA 2 32.6 0 2 1011 14 1.0 720.0 9.52686 31.9 31.2
>
> Fields:
>
> [Column]{.underline} [Name]{.underline} [Format]{.underline}
> [Range]{.underline} [Example]{.underline}
>
> 1 Record Type a E E
>
> 3-6 Survey Point Num. nnnn 1-9999 9
>
> 8-33 Designation a/n Rena 2
>
> 35-38 Temperature nnn.n -30.0\<\>110. 32.6
>
> 40 Wind Code n 0,1,2 0
>
> 42 Sun Code n 0,1,2 2
>
> 44-47 Time hhmm 1011
>
> 49-51 Number Of Setups nnn 14
>
> 53-57 Stadia Imbalance nnn.n -90.0\<\>90.0 1.0
>
> 59-64 Section Length nnnn.n 4.0\<\>3100.0 720.0
>
> 66-75 Elevation diff. nnnn.nnnnn -1000\<\>1000 9.52686
>
> 77-81 Mean Low Probe Tmp nnn.n 31.9
>
> 83-87 Mean Upr Probe Tmp nnn.n 31.2
>
> Stadia Imbalance -- Final difference between backsight and foresight
> distance at the end of the section
>
> Elevation diff. -- Difference in elevation between beginning and
> ending benchmark
>
> Section length -- Length in meters of the section
>
> **[Error checking during observations]{.underline}**
>
> The following errors are flagged based on order and class as defined
> in:
>
> FGCS Specifications and Procedures to Incorporate Electronic
> Digital/Bar-Code Leveling Systems
>
> <http://www.ngs.noaa.gov/FGCS/tech_pub/Fgcsvert.v41.specs.pdf>
>
> Order 1 1 2 2 3
>
> Class 1 2 1 2
>
> Collimation Exceeds Tolerance X.XX mm/m where X.XX --
>
> 0.05 0.05 0.05 0.05 0.10
>
> Setup Imbalance Exceeds X.X meters if foresight and backsight
> distances differ more than X.X meters where X.X =
>
> Per setup (m) 2.0 5.0 5.0 10.0 10.0
>
> Per section (m) 4.0 10.0 10.0 10.00 10.0
>
> Maximum sight distance (m) 50 60 60 70 90
>
> deltah1 -- deltah2 for one setup 0.30 0.30 0.60. 0.70 1.30
>
> not to exceed (mm) for MDS
>
> The following general errors and warnings are flagged during
> observations:
>
> Temperature Gradient Exceeded if top and bottom probe temperatures \>
> 1.0 and \< -3.0 degrees.
>
> Low shot on rod if reading is taken below the 0.5m mark.