Survey Identifier: CH115L07
Format Acronym: MGD77
Data Center File Number: 02010067
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. JOHN MILLIMAN
Project: CRUISE 115, LEG 7
Funding: IDOE
Survey Departure Date (yyyymmdd): 19740522
Port of Departure: RECIFE,BRAZIL
Survey Arrival Date (yyyymmdd): 19740529
Port of Arrival: FORTALEZA,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: -03
Bottommost Latitude: -10
Leftmost Longitude: -039
Rightmost Longitude: -033
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=-1.23MGAL/DAY BIAS=-225.87
Departure Base Station Gravity: 9781758
Departure Base Station Description: WHOI BASE STATION 863/317
Arrival Base Station Gravity: 9780904
Arrival Base Station Description: 99
Number of Data Records: 3602
Min/Max Data Record:
Date: 1974 05 22
Latitude: -9.24404
Longitude: -38.40300
Bathymetry, 2- Way Traveltime: 000150
Bathymetry, Corrected Depth: 11.0
Magnetics Total Field, 1st Sensor: 253770
Magnetics Residual Field: -07540
Observed Gravity: 9779790
Free-Air Anomaly: -0839
Min/Max Data Record:
Date: 1974 05 29
Latitude: -3.68641
Longitude: -33.34800
Bathymetry, 2- Way Traveltime: 065400
Bathymetry, Corrected Depth: 4933.0
Magnetics Total Field, 1st Sensor: 270940
Magnetics Residual Field: +04220
Observed Gravity: 9782342
Free-Air Anomaly: +0963