Survey Identifier: DI90L1-2


Format Acronym: MGD77
Data Center File Number: 19100003
Parameters Surveyed Code: 55500
File Creation Date (yyyymmdd): 19830425
Source Institution: INSTITUTE OF OCEANOGRAPHIC SCIENCES, UK
Country: UNITED KINGDOM
Platform Name: DISCOVERY
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): D. G. ROBERTS
Project: DISCOVERY CRUISE 90 LEG1, LEG2
Funding: BRITISH GOVERNMENT
Survey Departure Date (yyyymmdd): 19780120
Port of Departure: SOUTH SHIELDS, ENGLAND
Survey Arrival Date (yyyymmdd): 19780302
Port of Arrival: BREST, FRANCE
Navigation Instrumentation: MAGNAVOX SATELLITE RECEIVER
Geodetic Datum/Position: SAT PLUS DR
Bathymetry Instrumentation: IOS PES MARK 3 10KHZ 20DEG 2DEG SWEEP
Additional Forms of Bathymetric Data: ANALOGUE
Magnetics Instrumentation: PROTON PRECESSION VARIAN V75
Additional Forms of Magnetics Data: ANALOGUE
Gravity Instrumentation: LACOSTE AND ROMBERG S40
Additional Forms of Gravity Data: ANALOGUE
Topmost Latitude of Survey: +55
Bottommost Latitude: +31
Leftmost Longitude: -016
Rightmost Longitude: +000
General Digitizing Rate of Bathymetry: 060
General Sampling Rate of Bathymetry: 2 SEC
Assumed Sound Velocity: 08000
Bathymetric Datum Code: 00
Interpolation Scheme: NONE
General Digitizing Rate of Magnetics: 020
General Sampling Rate of Magnetics: 02
Magnetic Sensor Tow Distance: 0250
Reference Field Code: 03
Reference Field: IGRF 65
Method of Applying Residual Field: LIN INTERP 1*1 DEG SQUARE
General Digitizing Rate of Gravity: 020
General Sampling Rate of Gravity: 01
Theoretical Gravity Formula Code: 3
Theoretical Gravity Formula: IAG SYSTEM 1967
Reference System Code: 3
Reference System: SYSTEM IGSN71
Corrections Applied: CROSS COUPLING
Departure Base Station Gravity: 9814947
Departure Base Station Description: NEWCASTLE UNIV. PENDULUM
Arrival Base Station Gravity: 9800757
Arrival Base Station Description: LISBON A
Additional Documentation: DATA GAP 1616 31JAN78 TO 0702 2FEB78, FAULTY NAVIGATION DATA 1018-1600 31JAN, DATA GAP 0828-0856 22FEB, DATA GAP 0856 22FEB TO 2054 23FEB, MID-CRUISE PORT LISBON, PORTUGAL 8-FEB-78 TO 11-FEB-78, END OF CRUISE GRAVITY TIE AT BREST(4215) 980939.7, *** LONGITUDE ERROR 780120 1556 TO 780121 1422 , SIGN SHOULD BE POSITIVE ***
Number of Data Records: 24964

Min/Max Data Record:
Date: 1978 01 20
Latitude: +31.74100
Longitude: -15.44830
Bathymetry, Corrected Depth: 24.0
Magnetics Total Field, 1st Sensor: 403140
Magnetics Residual Field: -04370
Free-Air Anomaly: -1800

Min/Max Data Record:
Date: 1978 03 02
Latitude: +54.11630
Longitude: -0.00470
Bathymetry, Corrected Depth: 5287.0
Magnetics Total Field, 1st Sensor: 474000
Magnetics Residual Field: +01220
Free-Air Anomaly: +1770