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Rationalized Detailed Gravity Data
Southern Saskatchewan

FORMAT DESCRIPTOR FOR ASCII DATA FILE

NOTE: Data are also included on this CD as DBF (DBase5) and GDB (GEOSOFT/OASIS) format database files.
 

COLUMNS  FIELD    DESCRIPTION
-------  -----    -----------
  2-6   - PROJ    - project number - numbers greater than 20000 are from the
                             National Gravity Anomaly Data Base
                           - numbers 19941 and 19942 are from Mobile Oil Corp.
                           - all other projects are from Saskatchewan Energy
                             and Mines Digitized Gravity Archive
  8-15  - STN     - station number - unique for each station within a project
 17-26  - DECLAT  - latitude (decimal degrees)
 28-38  - DECLONG - longitude (decimal degrees)
 40-45  - CAV     - coordinate accuracy value (metres)
 47-54  - ELEV    - elevation (metres)
 56-60  - EAV     - elevation accuracy value (metres)
 62-67  - DEPTH   - depth (metres) - all stations are on land, depth is always 0
 69-73  - DAV     - depth accuracy value (metres)
  75    - DT      - depth type - describes the type of observation

            0 = A depth of water or thickness of ice was present
                but was not measured.
            1 = Observation taken on land.
            2 = Observation taken on the surface of an ocean or lake.
            3 = Observation taken on the bottom of an ocean or lake.
            4 = Observation taken on an ice cap.
            5 = Observation taken on an ice-covered ocean or lake.
            6 = Observation taken on the surface of the sea in a fiord.
            7 = Observation taken on sea ice in a fiord.
            8 = Observation taken on the bottom of the sea in a fiord.

         NOTE - all digitized stations are land static observations (DT=1)

 77-85  - ADJG    - adjusted gravity value (mGal)
                  - observed value of gravity adjusted the data of the National
                    Gravity Data Base which is referred to IGSN71
 87-92  - GAV     - gravity accuracy value (mGal)
 94-98  - TCOR    - terrain correction (mGal)
100-103 - TAV     - terrain correction accuracy (mGal)
105-111 - FREEAIR - free air gravity anomaly (mGal)
113-117 - FAV     - free air gravity anomaly accuracy (mGal)
119-125 - BOUGUER - Bouguer gravity anomaly (mGal)
127-131 - BAV     - Bouguer gravity anomaly accuracy (mGal)
  133   - STATUS  - station status (D-Deleted, A-Active)
135-144 - OSTN    - original station number in archived SEM files
146-155 - OPROJ   - original project number in archived SEM files
157-166 - OBOUG   - original digitzed Bouguer value in archived SEM files
168-177 - ECF     - elevation correction factor (mGal/f) from archived SEM files
179-188 - OBSG    - observed gravity recalculated from OBOUG
190-199 - OOBSG   - observed gravity as levelled by NIMA
201-210 - OFA     - free air anomaly as levelled by NIMA
212-221 - OBA     - Bouguer anomaly as levelled by NIMA
223-232 - RHOC    - crustal rock density (g/cc) used to compute BOUGUER
234-243 - ELEVCOR - corrections made to elevation (metres)
                  - only for stations with ESTATUS=C
245-254 - OBSGCOR - correction made to OBSG to generate ADJG (mGal)
  256   - ESTATUS - elev. status (D-Deleted, A-Active, C-Corrected)
 

FORTRAN READ & FORMAT STATEMENTS
--------------------------------
      READ(1,16)PROJ,STN,DECLAT,
     *DECLONG,CAV,ELEV,EAV,DEPTH,DAV,DT,ADJG,GAV,TCOR,TAV,
     *FREEAIR,FAV,BOUGUER,BAV,STATUS,OSTN,OPROJ,OBOUG,ECF,OBSG,OOBSG,OFA,
     *OBA,RHOC,ELEVCOR,OBSGCOR,ESTATUS

   16 FORMAT(1X,I5,1X,I8,1X,F10.6,1X,F11.6,1X,F6.1,1X,F8.3,1X,F5.2,
     *1X,F6.1,1X,F5.1,1X,I1,1X,F9.2,1X,F6.3,1X,F5.1,1X,F4.1,1X,F7.2,
     *1X,F5.2,1X,F7.2,1X,F5.2,1X,A1,1X,I10,1X,I10,1X,F10.3,1X,F10.5,1X,F10.2,1X,
     *F10.2,1X,F10.2,1X,F10.2,1X,F10.2,1X,F10.2,1X,F10.2,1X,A1)

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