Survey Identifier: WEST06MV
Format Acronym: MGD77
Data Center File Number: 15020150
Parameters Surveyed Code: 55533
File Creation Date (yyyymmdd): 19
Source Institution: SCRIPPS INSTITUTION OF OCEANOGRAPHY
Country: USA
Platform Name: R/V MELVILLE
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): J.HILDEBRAND, L.DORMAN
Project: WESTWARD EXPEDITION LEG 6
Funding: NSF OCE94-00707
Survey Departure Date (yyyymmdd): 19940830
Port of Departure: BRISBANE, AUSTRALIA
Survey Arrival Date (yyyymmdd): 19940930
Port of Arrival: NUKU ALOFA, TONGA
Navigation Instrumentation: GPS,TRIMBLE MOD. 4000AX
Geodetic Datum/Position: LINEAR INTERP.BETWEEN ADJACENT FIXES
Bathymetry Instrumentation: SEABEAM 2000 w/ SIDESCAN
Additional Forms of Bathymetric Data: ANAL.REC,35MM FILM,DIGITAL MAG. TAPE
Magnetics Instrumentation: GEOMETRICS MAGNETOMETER MOD-G 801/3
Additional Forms of Magnetics Data: ANAL.REC, 35MM FILM, DIGITAL TAPE
Gravity Instrumentation: BELL BGM-3 METER
Additional Forms of Gravity Data: DIGITAL TAPE
Seismic Instrumentation: WATERGUNS
Formats of Seismic Data: ANAL. REC, 35MM FILM
Topmost Latitude of Survey: -15
Bottommost Latitude: -28
Leftmost Longitude: +153
Rightmost Longitude: -169
General Digitizing Rate of Bathymetry: 010
General Sampling Rate of Bathymetry: 1PING IN H2O
Assumed Sound Velocity: 15000
Interpolation Scheme: 1 MINUTE VALUES EXTRACTED FROM SEABEAM VERTICAL BEAM
General Digitizing Rate of Magnetics: 010
General Sampling Rate of Magnetics: 06
Reference Field Code: 03
Reference Field: IGRF-1990
Method of Applying Residual Field: LIN.INTERP.POINTS WITHIN ONE DEGREE SQUARE
General Digitizing Rate of Gravity: 010
General Sampling Rate of Gravity: 01
Theoretical Gravity Formula Code: 3
Theoretical Gravity Formula: IAG SYSTEM 1967
Reference System Code: 3
Reference System: SYSTEM IGSN 71
Corrections Applied: EOTVOS AND METER DRIFT
Departure Base Station Gravity: 9791553
Departure Base Station Description: DOD 0027-4 BRISBANE, AUS
Arrival Base Station Gravity: 9807275
Arrival Base Station Description: DOD 0249-0 DUNEDIN,NEW ZEALAND
Additional Documentation: PROCESSED BY GEOLOGICAL DATA CENTER, SCRIPPS INSTITUTION OF OCEANOGRAPHY, DEPTHS CORRECTED FOR 5 METER SHIP DRAFT. NAVIGATION: DR BETWEEN 1 MINUTE, INTERVAL GPS FIXES. GPS PRESENT 24 HRS/DAY. GRAVITY: 1 SEC METER COUNTS, FILTERED WITH 99 DEC STD.DEV. GAUSSIAN CONVOLUTION WINDOW. FREE AIR ANOMALY, SPIKES PRESENT BECAUSE SAME FILTER NOT USED FOR NAVIGATION. FOLLOWING INFO, FROM MULTIBEAM BATHYMETRY: Heading Sensor Sperry MK23 Gyro; Vertical reference, unit sensor Datawell Hippy Model 120; Navigation: Horizontal_Datum WGS84.
Number of Data Records: 44014
Min/Max Data Record:
Date: 1994 08 30
Latitude: -27.44851
Longitude: -179.99984
Bathymetry, 2- Way Traveltime: 000120
Bathymetry, Corrected Depth: 9.0
Magnetics Total Field, 1st Sensor: 400370
Magnetics Residual Field: -09576
Observed Gravity: 9782981
Free-Air Anomaly: -2049
Min/Max Data Record:
Date: 1994 09 29
Latitude: -15.33287
Longitude: +179.99715
Bathymetry, 2- Way Traveltime: 112107
Bathymetry, Corrected Depth: 8596.0
Magnetics Total Field, 1st Sensor: 533170
Magnetics Residual Field: +22790
Observed Gravity: 9791233
Free-Air Anomaly: +2450