Survey Identifier: TG761
Format Acronym: MGD77
Data Center File Number: 08100001
Parameters Surveyed Code: 51111
File Creation Date (yyyymmdd): 19820427
Source Institution: HAWAII INST. GEOPHYSICS FOR CCOPSOPAC
Country: U.S.A.
Platform Name: R/V ATA
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): CHARLES W. LANDMESSER
Project: CCOP/SOPAC-UN/RAS/72/122,TG-76-1
Funding: UNDP
Survey Departure Date (yyyymmdd): 19760426
Port of Departure: NUKU'ALOFA,TONGA
Survey Arrival Date (yyyymmdd): 19760512
Port of Arrival: NUKU'ALOFA,TONGA
Navigation Instrumentation: 15-MILES RADAR SYSTEM,SEXTANT
Geodetic Datum/Position: 1-RADAR/2-SEXTANT
Bathymetry Instrumentation: (SEE ADD.DOC. 18)
Additional Forms of Bathymetric Data: ANALOG RECORDS,MICROFILM.
Topmost Latitude of Survey: -18
Bottommost Latitude: -22
Leftmost Longitude: -175
Rightmost Longitude: -173
General Digitizing Rate of Bathymetry: 58
General Sampling Rate of Bathymetry: 01 SEC/SWEEP
Assumed Sound Velocity: 15000
Bathymetric Datum Code: 00
Interpolation Scheme: NONE.(PICKED PEAKS/TROUGHS AND 15MIN INTERVLS IF SMOOTH)
Additional Documentation: 06 RAYTHEON PTR106C-1,07KHZ,01 SEC/SWEEP. BATHYMETRY ON THE CENTRAL PART, 06 OF THE TONGAN PLATFORM ACCOMPANYING A SAMPLING PROGRAM IN SEARCH OF, 06 PHOSPHORITES AND ENCRUSTING MINERAL DEPOSITIONS.
Number of Data Records: 3707
Min/Max Data Record:
Date: 1976 04 26
Latitude: -21.12333
Longitude: -174.99333
Bathymetry, 2- Way Traveltime: 000070
Bathymetry, Corrected Depth: 5.0
Min/Max Data Record:
Date: 1976 05 12
Latitude: -18.00000
Longitude: -173.00000
Bathymetry, 2- Way Traveltime: 072020
Bathymetry, Corrected Depth: 5435.0