COORDINATE DEFINITION FILE (BLKCORD)

The coordinate definition file (BLKCORD) is used to define

• Fixed and approximate coordinates
  • Unique station number
  • Station name
  • Latitude, Longitude, Orthometric height
  • Cartesian X, Y, Z
  • Constrained Latitude, longitude and orthometric height
• Astromonic coordinate observations
  • Unique station number
  • Latitude, Longitude
• Geoid ellipsoid defintion
  • Unique station number
  • Meridian, prime vertical, and geoid height components
• Auxiliary parameter definition
  • Unique identification
  • Unique Auxiliary parameter name
  • Auxiliary parameter type
  • Optional initial value

SAMPLE COORDINATE DEFINITION FILE (BLKCORD)

 ----+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
   4   629009   LASH                     64  3 52.70400 106 31 11.96400  540.000
  10
   4   629008   JADE                     63 59 18.91099 106 19   .70117  550.000
   4   629007   INDIA                    63 59  1.58620 106 33 21.51552  650.000
   4   629005   GATE                     63 53 49.31804 106 23 56.37197  530.000
   4   629006   HOPE                     63 55 13.06801 106 45  1.25770  430.000
   4   629003   EMBER                    63 47 13.35853 106 42 40.09976  540.000
   4   629004   SIFTON                   63 45 25.02235 106 22 56.58856  440.000
   4   629022   HANBURY                  63 35  4.82998 106 22 12.96829  550.000
   4   629023   FUNNEL                   63 36 40.00494 106 34 52.34573  460.000
   4   629024   CRITCHELL                63 29 35.29322 107 06 18.52198  550.000
   4   629021   MARY                     63 18 43.44249 106 27 38.33798  550.000
   7AST629003   EMBER                    63 47 26.72982 106 42 43.30000
   9   629009   LASH                            0.00001        11.97167     6.0
   9   629008   JADE                            0.00010         0.70323     6.0
   9   629007   INDIA                           1.59369        21.51695     6.0
   9   629005   GATE                           49.32758        56.36833     6.0
   9   629006   HOPE                           13.07454         1.25373     6.0
   9   629003   EMBER                          13.36491        40.09077     6.0
   9   629004   SIFTON                         25.03197        56.57602     6.0
   9   629022   HANBURY                         4.84011        12.94787     6.0
   9   629023   FUNNEL                         40.01303        52.32661     6.0
   9   629024   CRITCHELL                      35.29401        18.50068     6.0
   9   629021   MARY                           43.45239        38.29745     6.0
  94DISGEODSCAL Geodimeter      scpr    0.5    <-- optional initial value

Sample geographic coordinate record

 
 ----+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
   4   629009   LASH                     64  3 52.70400 106 31 11.96400  540.000

• Column 3 -- Code used to identify the record type
• Column 7-15 -- Number: unique string used to identify the station
• Column 16-29 -- Name: Additional identification
• Indicator +/- N/S Positive North default north Column 40
• Latitude degrees (90) Column 41-42
• Latitude minutes (60) Column 43-45
• Latitude seconds (60.0) Column 46-54
• Indicator +/- E/W Positive West default west Column 55
• Longitude degrees (360) Column 56-58
• Longitude minutes (60) Column 59-61
• Longitude seconds (60.0) Column 62-70
• Orthometric height (-1000.0 30000.0) Column 71-79

Sample Astronomic coordinate record

 ----+---|----+----|----+----|----+----|----+----|----+----|----+----|----+----|
   7AST629003   EMBER                   63 47 26.72982 106 42 43.3000       

• Code used to identify the record type Column 3
• Number - unique string used to identify the station Column 7-15
• Name - Additional identification Column 16-29
• Indicator +/- N/S Positive North default north Column 40
• Latitude degrees (90) Column 41-42
• Latitude minutes (60) Column 43-45
• Latitude seconds (60.0) Column 46-54
• Indicator +/- E/W Positive West default west Column 55
• Longitude degrees (360) Column 56-58
• Longitude minutes (60) Column 59-61
• Longitude seconds (60.0) Column 62-70
• Orthometric height (-1000.0 30000.0) Column 71-80

Sample deflection record

 ----+---|----+----|----+----|----+----|----+----|----+----|----+----|----+----|
   9    629003  EMBER                         13.36491        40.09077    6.0       

• Code - used to identify the record type Column 3
• Number - unique string used to identify the station Column 7-15
• Name - Additional identification Column 16-29
• Deflection Indicator +/- N/S Positive North default north Column 40
• Meridian degrees (90) Column 41-42
• Meridian minutes (60) Column 43-45
• Meridian seconds (60.0) Column 46-54
• Deflection Indicator +/- E/W Positive East default east Column 55
• Prime vertical degrees (360) Column 56-58
• Prime vertical minutes (60) Column 59-61
• Prime vertical seconds (60.0) Column 62-70
• Geoid-ellipsoid separation Column 71-80

Sample auxiliary parameter identification record

 ----+---|----+----|----+----|----+----|----+----|----+----|----+----|----+----|
  94DIS geodscal geodimeter    PR        0.5 

• Code used to identify the record type Column 2-3
• Type - used to identify the type of observation
• Unique identifier Column 7-15
• Additional identifier Column 16-29
• Auxiliary parameter type - used to identify a type of auxiliary parameter Column 32-35
• Initial value - optional value used to set initial value Col 40-44

Sample fixed station trailer

 ----+---|----+----|----+----|----+----|----+----|----+----|----+----|----+----|
  10

Used to indicate the end of the fixed stations. If not included in the BLKCORD file there are 0 fixed stations. In this case there should be some other form of positional constraint of Latitude longitude and orthometric height. This can be included in the observations as positon equations or constraint equations (INTCOBS).

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