Survey Identifier: TBD396
Format Acronym: MGD77
Data Center File Number: 71020007
Parameters Surveyed Code: 55111
File Creation Date (yyyymmdd): 19891020
Source Institution: SOUTH AFRICAN GEOLOGICAL SURVEY
Country: SOUTH AFRICA
Platform Name: THOMAS B DAVIE
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): NO INFN
Project: TRACK NUMBERS 657-665,667-682.
Funding: NO INFN
Survey Departure Date (yyyymmdd): 19790822
Survey Arrival Date (yyyymmdd): 19790913
Navigation Instrumentation: NO INFN
Geodetic Datum/Position: NO INFN
Bathymetry Instrumentation: NO INFN
Additional Forms of Bathymetric Data: DIGITAL
Magnetics Instrumentation: NO INFN
Additional Forms of Magnetics Data: DIGITAL
Gravity Instrumentation: NONE
Seismic Instrumentation: NONE
Formats of Seismic Data: NONE
Topmost Latitude of Survey: -31
Bottommost Latitude: -39
Leftmost Longitude: +013
Rightmost Longitude: +021
General Digitizing Rate of Bathymetry: 050
Interpolation Scheme: NO INFN
General Digitizing Rate of Magnetics: 050
Reference Field Code: 88
Reference Field: DGRF-75
Method of Applying Residual Field: FOR EACH DATA VALUE.
Additional Documentation: *DATA QUALITY IS SUSPECT.* NAV:HAS PROBLEM AREAS WHICH COULD NOT BE, CORRECTED WITHOUT SHIP LOGS OR CHARTS. BATH:ASSUMED UNCORRECTED METERS. MAG:DGRF75 CORRECTION. (SKS/THD/HIG).
Number of Data Records: 5569
Min/Max Data Record:
Date: 1979 08 22
Latitude: -38.57033
Longitude: +13.65250
Bathymetry, 2- Way Traveltime: 001900
Bathymetry, Corrected Depth: 142.0
Magnetics Total Field, 1st Sensor: 276340
Magnetics Residual Field: -04856
Min/Max Data Record:
Date: 1979 09 13
Latitude: -31.24950
Longitude: +20.72083
Bathymetry, 2- Way Traveltime: 065370
Bathymetry, Corrected Depth: 4918.0
Magnetics Total Field, 1st Sensor: 296200
Magnetics Residual Field: +15621