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)