Survey Identifier: C2711
Format Acronym: MGD77
Data Center File Number: 01010271
Parameters Surveyed Code: 55533
File Creation Date (yyyymmdd): 19901126
Source Institution: LAMONT-DOHERTY GEOLOGICAL OBSERV./URI
Country: United States
Platform Name: R/V Conrad
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): Dr. S Cande
Project: c2711
Funding: ONR
Survey Departure Date (yyyymmdd): 19861203
Port of Departure: Capetown, South Africa
Survey Arrival Date (yyyymmdd): 19870102
Port of Arrival: Rio de Janeiro, Brazil
Navigation Instrumentation: GPS, TRANSIT SATELLITE
Geodetic Datum/Position: dead reckoning
Bathymetry Instrumentation: seabeam vertical beam
Additional Forms of Bathymetric Data: 3.5 PDR
Magnetics Instrumentation: proton procession
Gravity Instrumentation: Bell BGM-3
Topmost Latitude of Survey: -22
Bottommost Latitude: -34
Leftmost Longitude: -042
Rightmost Longitude: +018
General Digitizing Rate of Bathymetry: 10
General Sampling Rate of Bathymetry: VAR W/ DEPTH
Assumed Sound Velocity: 15000
Bathymetric Datum Code: 0
General Digitizing Rate of Magnetics: 10
Reference Field Code: 4
Reference Field: IGRF-75
General Digitizing Rate of Gravity: 10
General Sampling Rate of Gravity: 60
Theoretical Gravity Formula Code: 2
Reference System Code: 2
Reference System: Potsdam
Additional Documentation: Other data reported to have been collected on this cruise were single-channel, seismics. Single beam bathymetry data from 34.97403 to 41.64260 degrees W are from URI, processed multibeam bathymetry with an interpolation scheme in 1 MINUTE, EXTRACTIONS CLOSEST TO THE MINUTE (VERTICAL BM), Navigation for the multibeam bathymetry was shifted to match bathymetry in the, survey area.
Number of Data Records: 65963
Min/Max Data Record:
Date: 1986 12 03
Latitude: -33.51728
Longitude: -41.64260
Bathymetry, 2- Way Traveltime: 000816
Bathymetry, Corrected Depth: 61.0
Magnetics Total Field, 1st Sensor: 239570
Magnetics Residual Field: -21440
Observed Gravity: 9788307
Free-Air Anomaly: -0465
Min/Max Data Record:
Date: 1987 01 01
Latitude: -22.53900
Longitude: +17.16600
Bathymetry, 2- Way Traveltime: 076176
Bathymetry, Corrected Depth: 5759.0
Magnetics Total Field, 1st Sensor: 304890
Magnetics Residual Field: +51794
Observed Gravity: 9798022
Free-Air Anomaly: +2514