Survey Identifier: DI101
Format Acronym: MGD77
Data Center File Number: 19100012
Parameters Surveyed Code: 55511
File Creation Date (yyyymmdd): 19850129
Source Institution: INSTITUTE OF OCEANOGRAPHIC SCIENCES, UK
Country: UNITED KINGDOM
Platform Name: DISCOVERY
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): D. ROBERTS
Project: DISCOVERY CRUISE 101
Funding: BRITISH GOVT.
Survey Departure Date (yyyymmdd): 19790410
Port of Departure: CAPETOWN, SOUTH AFRICA
Survey Arrival Date (yyyymmdd): 19790506
Port of Arrival: SEYCHELLES
Navigation Instrumentation: MAGNAVOX SATELLITE NAVIGATOR
Geodetic Datum/Position: PRIM-SAT PLUS DEAD RECKONING
Bathymetry Instrumentation: PRECISION ECHO SOUNDER - IOS MK 3
Additional Forms of Bathymetric Data: ANALOGUE
Magnetics Instrumentation: VARIAN V75 PROTON PRECESSION
Additional Forms of Magnetics Data: ANALOGUE
Gravity Instrumentation: LA COSTE AND ROMBERG S40
Additional Forms of Gravity Data: ANALOGUE
Topmost Latitude of Survey: -03
Bottommost Latitude: -37
Leftmost Longitude: +019
Rightmost Longitude: +057
General Digitizing Rate of Bathymetry: 060
General Sampling Rate of Bathymetry: 2/SEC
Assumed Sound Velocity: 15000
Bathymetric Datum Code: 00
Interpolation Scheme: NONE
General Digitizing Rate of Magnetics: 020
General Sampling Rate of Magnetics: 02
Magnetic Sensor Tow Distance: 0100
Reference Field Code: 04
Reference Field: IGRF-75
Method of Applying Residual Field: LINEAR INTERPOLATION PER DEGREE SQUARE
General Digitizing Rate of Gravity: 060
General Sampling Rate of Gravity: 00
Theoretical Gravity Formula Code: 3
Theoretical Gravity Formula: IAG SYSTEM 1967
Reference System Code: 3
Reference System: IGSN-71
Corrections Applied: CROSS COUPLING ONLY + EOTVOS
Departure Base Station Gravity: 9796389
Departure Base Station Description: 46738B CAPETOWN OBSERVATORY
Arrival Base Station Gravity: 9781170
Arrival Base Station Description: VICTORIA SEYCHELLES IGNS 71EST
Additional Documentation: CAPETOWN ALONGSIDE G BASE VALUE AT METER = 979633.8 MGAL TIED TO 46738B, SEYCHELLES VALUE IS ESTIMATE ON PROXIMITY TO BASE STATION - NO TIE MADE - THE
Number of Data Records: 17803
Min/Max Data Record:
Date: 1979 04 10
Latitude: -36.97050
Longitude: +19.13720
Bathymetry, Corrected Depth: 29.0
Magnetics Total Field, 1st Sensor: 282900
Magnetics Residual Field: -11490
Free-Air Anomaly: -1300
Min/Max Data Record:
Date: 1979 05 06
Latitude: -3.25800
Longitude: +56.06970
Bathymetry, Corrected Depth: 5455.0
Magnetics Total Field, 1st Sensor: 360100
Magnetics Residual Field: +06470
Free-Air Anomaly: +1190