Survey Identifier: DI118L2
Format Acronym: MGD77
Data Center File Number: 19100027
Parameters Surveyed Code: 55511
File Creation Date (yyyymmdd): 19850202
Source Institution: INSTITUTE OF OCEANOGRAPHIC SCIENCES, UK
Country: UNITED KINGDOM
Platform Name: DISCOVERY
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): T. J. G. FRANCIS
Project: DISCOVERY CRUISE 118 LEG 2
Funding: N.E.R.C.
Survey Departure Date (yyyymmdd): 19810313
Port of Departure: MADEIRA
Survey Arrival Date (yyyymmdd): 19810330
Port of Arrival: GIBRALTAR
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: LACOSTE AND ROMBERG S84
Additional Forms of Gravity Data: ANALOGUE
Topmost Latitude of Survey: +43
Bottommost Latitude: +30
Leftmost Longitude: -026
Rightmost Longitude: -008
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: 250
Reference Field Code: 88
Reference Field: IGRF-80
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
Departure Base Station Gravity: 9797694
Departure Base Station Description: FUNCHAL MADEIRA - HARBOUR BOL 45
Arrival Base Station Gravity: 9797758
Arrival Base Station Description: GIBRALTAR WEST PIER N MOLE
Additional Documentation: GIBRALTAR GRAVITY STATION IS SHIP TIE BY RVS AT NO 9 BOLLARD BERTH 2 ECHO WEST, PIER NORTH MOLE, LEG DRIFT = +0.48 MGAL/DAY
Number of Data Records: 11462
Min/Max Data Record:
Date: 1981 03 13
Latitude: +30.27570
Longitude: -25.93780
Bathymetry, Corrected Depth: 218.0
Magnetics Total Field, 1st Sensor: 319840
Magnetics Residual Field: -06750
Free-Air Anomaly: -1030
Min/Max Data Record:
Date: 1981 03 29
Latitude: +42.59970
Longitude: -8.92220
Bathymetry, Corrected Depth: 5797.0
Magnetics Total Field, 1st Sensor: 460120
Magnetics Residual Field: +04770
Free-Air Anomaly: +1550