Survey Identifier: HT7903
Format Acronym: MGD77
Data Center File Number: 05010007
Parameters Surveyed Code: 55513
File Creation Date (yyyymmdd): 19840507
Source Institution: GEOPHYSICS DIVISION, DSIR, NEW ZEALAND
Country: NEW ZEALAND
Platform Name: GRV TANGAROA
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): D. J. BENNETT
Project: HIKURANGI TROUGH 2
Funding: NZ GOVERNMENT
Survey Departure Date (yyyymmdd): 19790402
Port of Departure: WELLINGTON, NEW ZEALAND
Survey Arrival Date (yyyymmdd): 19790417
Port of Arrival: WELLINGTON, NEW ZEALAND
Navigation Instrumentation: SATELLITE
Geodetic Datum/Position: SATELLITE AND DEAD RECKONING
Bathymetry Instrumentation: 12 KHZ FREQUENCY
Magnetics Instrumentation: PROTON PRECESSION, GEOMETRICS
Gravity Instrumentation: LACOSTE AND ROMBERG S-80
Seismic Instrumentation: SINGLE CHANNEL
Formats of Seismic Data: MICROFILM AND ANALOG
Topmost Latitude of Survey: -39
Bottommost Latitude: -43
Leftmost Longitude: +174
Rightmost Longitude: -178
General Digitizing Rate of Bathymetry: 150
General Sampling Rate of Bathymetry: 1/SECOND
Assumed Sound Velocity: 15000
Bathymetric Datum Code: 00
Interpolation Scheme: 15-MINUTE INTERVALS AND PEAKS AND TROUGHS
General Digitizing Rate of Magnetics: 010
Reference Field Code: 88
Reference Field: PGRF 75
Method of Applying Residual Field: LINEAR INTERPOLATION BETWEEN NAVIGATION POINTS
General Digitizing Rate of Gravity: 010
General Sampling Rate of Gravity: 00
Theoretical Gravity Formula Code: 2
Theoretical Gravity Formula: INTERNAT. 1930
Reference System: NZ POTSDAM 1959
Corrections Applied: CROSS COUPLING ONLY
Departure Base Station Gravity: 9802919
Departure Base Station Description: WELLINGTON, NEW ZEALAND
Additional Documentation: DATA RECORD IN NEW ZEALAND STANDARD TIME, BATHYMETRY CORRECTED FOR DRAUGHT AND WATER DENSTIY
Number of Data Records: 17351
Min/Max Data Record:
Date: 1979 04 02
Latitude: -42.89790
Longitude: -179.99930
Bathymetry, Corrected Depth: 20.0
Magnetics Total Field, 1st Sensor: 549670
Magnetics Residual Field: -03090
Free-Air Anomaly: -1026
Min/Max Data Record:
Date: 1979 04 17
Latitude: -39.00180
Longitude: +180.00000
Bathymetry, Corrected Depth: 3694.0
Magnetics Total Field, 1st Sensor: 581270
Magnetics Residual Field: +06100
Free-Air Anomaly: +0696