Survey Identifier: CH115L06
Format Acronym: MGD77
Data Center File Number: 02010066
Parameters Surveyed Code: 555
File Creation Date (yyyymmdd): 1982 524
Source Institution: WOODS HOLE OCEANOGRAPHIC INSTITUTION
Country: U.S.A.
Platform Name: CHAIN
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): DR.DAVID JOHNSON
Project: CRUISE 115, LEG 6
Funding: NSF-ONR
Survey Departure Date (yyyymmdd): 19740422
Port of Departure: RIO DE JANEIRO, BRAZIL
Survey Arrival Date (yyyymmdd): 19740518
Port of Arrival: RECIFE, BRAZIL
Navigation Instrumentation: SATELLITE RECEIVER, DR
Geodetic Datum/Position: SAT. AND DR MERGED WITH SHIP VELOCITY
Bathymetry Instrumentation: PRIM-3.5,SEC-12, WIDE BEAM 1 SEC SWEEP
Additional Forms of Bathymetric Data: ANALOG RECORDS, PUNCHED TAPES
Magnetics Instrumentation: VARIAN PROTON-PRECESSION MAGNETOMETER
Additional Forms of Magnetics Data: ANALOG RECORDS, PUNCHED TAPES
Gravity Instrumentation: ARPA VIBRATING STRING ACCELEROMETER
Additional Forms of Gravity Data: ANALOG RECORDS, PUNCHED TAPE
Topmost Latitude of Survey: -08
Bottommost Latitude: -31
Leftmost Longitude: -044
Rightmost Longitude: -034
General Digitizing Rate of Bathymetry: 050
General Sampling Rate of Bathymetry: ONE/SECOND
Assumed Sound Velocity: 14630
Bathymetric Datum Code: 00
Interpolation Scheme: 5- MINUTES AND BREAK SLOPE
General Digitizing Rate of Magnetics: 050
General Sampling Rate of Magnetics: 60
Magnetic Sensor Tow Distance: 250
Reference Field Code: 03
Reference Field: IGRF 1965
Method of Applying Residual Field: LINER INTERPOLATION WITHIN DEGREE SQUARE
General Digitizing Rate of Gravity: 050
General Sampling Rate of Gravity: 60
Theoretical Gravity Formula Code: 3
Theoretical Gravity Formula: IGA SYSTEM 1967
Reference System Code: 2
Reference System: POTSDAM SYSTEM
Corrections Applied: DRIFT=-1.34MGAL/DAY BIAS=-185.25
Departure Base Station Gravity: 9788064
Departure Base Station Description: WHOI BASE STATION 860/317
Arrival Base Station Gravity: 9781758
Arrival Base Station Description: WHOI BASE STATION 863/317
Number of Data Records: 12239
Min/Max Data Record:
Date: 1974 04 22
Latitude: -30.96802
Longitude: -43.16640
Bathymetry, 2- Way Traveltime: 000650
Bathymetry, Corrected Depth: 49.0
Magnetics Total Field, 1st Sensor: 237190
Magnetics Residual Field: -05320
Observed Gravity: 9780000
Free-Air Anomaly: -0641
Min/Max Data Record:
Date: 1974 05 18
Latitude: -8.72093
Longitude: -34.72660
Bathymetry, 2- Way Traveltime: 064500
Bathymetry, Corrected Depth: 4858.0
Magnetics Total Field, 1st Sensor: 251970
Magnetics Residual Field: +09170
Observed Gravity: 9794574
Free-Air Anomaly: +0816