Survey Identifier: DI103B
Format Acronym: MGD77
Data Center File Number: 19100014
Parameters Surveyed Code: 55500
File Creation Date (yyyymmdd): 19850130
Source Institution: INSTITUTE OF OCEANOGRAPHIC SCIENCES, UK
Country: UNITED KINGDOM
Platform Name: DISCOVERY
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): R. C. SEARLE
Project: DISCOVERY CRUISE 103 PART B
Funding: BRITISH GOVT.
Survey Departure Date (yyyymmdd): 19790719
Port of Departure: DJIBOUTI
Survey Arrival Date (yyyymmdd): 19790725
Port of Arrival: SUEZ
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: +28
Bottommost Latitude: +18
Leftmost Longitude: +034
Rightmost Longitude: +040
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 PLUS EOTVOS
Additional Documentation: GRAVITY BASE STATION DATA - REFER TO PRINCIPAL SCIENTTIST
Number of Data Records: 3712
Min/Max Data Record:
Date: 1979 07 19
Latitude: +18.18170
Longitude: +34.12220
Bathymetry, Corrected Depth: 390.0
Magnetics Total Field, 1st Sensor: 382700
Magnetics Residual Field: -13670
Free-Air Anomaly: -2640
Min/Max Data Record:
Date: 1979 07 24
Latitude: +27.83080
Longitude: +39.91950
Bathymetry, Corrected Depth: 2754.0
Magnetics Total Field, 1st Sensor: 423600
Magnetics Residual Field: +01340
Free-Air Anomaly: +0530