Survey Identifier: A2093L03


Format Acronym: MGD77
Data Center File Number: 02020062
Parameters Surveyed Code: 55511
File Creation Date (yyyymmdd): 1982 530
Source Institution: WOODS HOLE OCEANOGRAPHIC INST
Country: U.S.A.
Platform Name: ATANTIS II
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): DR.JOHN FARRINGTON
Project: CRUISE 93, LEG 3
Funding: NSF,ONR
Survey Departure Date (yyyymmdd): 19751222
Port of Departure: CAPETOWN, SOUTH AFRICA
Survey Arrival Date (yyyymmdd): 19760108
Port of Arrival: CAPETOWN SOUTH AFRICA
Navigation Instrumentation: 706 SATELLITE RECEIVER
Geodetic Datum/Position: SAT.MERGED WITH SHIP VELOCITY
Bathymetry Instrumentation: PRIM-3.5,SEC-12, WIDE BEAM 1 SEC.SWEEP
Additional Forms of Bathymetric Data: ANALOG RECORDS
Magnetics Instrumentation: VARIAN PROTON-PRECESSION MAG.V-85
Additional Forms of Magnetics Data: ANALOG RECORDS, PUNCHED TAPE
Gravity Instrumentation: ARPA-1 VIBRATING STRING ACCELEROMETER
Additional Forms of Gravity Data: ANALOG RECORDS, PUNCHED TAPE
Topmost Latitude of Survey: -21
Bottommost Latitude: -34
Leftmost Longitude: +008
Rightmost Longitude: +019
General Digitizing Rate of Bathymetry: 050
General Sampling Rate of Bathymetry: ONE/SECOND
Assumed Sound Velocity: 14630
Bathymetric Datum Code: 00
Interpolation Scheme: 5-MINUTES AND BREAK SLOPE
General Digitizing Rate of Magnetics: 010
General Sampling Rate of Magnetics: 03
Magnetic Sensor Tow Distance: 250
Reference Field Code: 04
Reference Field: IGRF 1975
Method of Applying Residual Field: LINER INTERPOLATION WITHIN DEGREE SQUARE
General Digitizing Rate of Gravity: 050
General Sampling Rate of Gravity: 60
Theoretical Gravity Formula Code: 3
Theoretical Gravity Formula: IGA SYSTEM 1967
Reference System Code: 3
Reference System: IGSN 71
Corrections Applied: DRIFT=+.561MGAL/DAY BIAS=+25.2
Departure Base Station Gravity: 9796390
Departure Base Station Description: WHOI BASE STATION 888
Arrival Base Station Gravity: 9796392
Arrival Base Station Description: WHOI BASE STATION 889
Number of Data Records: 7289

Min/Max Data Record:
Date: 1975 12 22
Latitude: -33.88168
Longitude: +8.57400
Bathymetry, 2- Way Traveltime: 000450
Bathymetry, Corrected Depth: 34.0
Magnetics Total Field, 1st Sensor: 284940
Magnetics Residual Field: -04870
Observed Gravity: 9787374
Free-Air Anomaly: -0309

Min/Max Data Record:
Date: 1976 01 08
Latitude: -21.71388
Longitude: +18.30910
Bathymetry, 2- Way Traveltime: 059975
Bathymetry, Corrected Depth: 4504.0
Magnetics Total Field, 1st Sensor: 310490
Magnetics Residual Field: +04380
Observed Gravity: 9797067
Free-Air Anomaly: +1036