Survey Identifier: WEST12MV
Format Acronym: MGD77
Data Center File Number: 15020145
Parameters Surveyed Code: 55131
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): TRANSIT LEG
Project: WESTWARD EXPEDITION LEG 12
Funding: NSF&ONR&UC SHIP FUND
Survey Departure Date (yyyymmdd): 19950418
Port of Departure: HOBART,TASMANIA
Survey Arrival Date (yyyymmdd): 19950505
Port of Arrival: PAPEETE,TAHITI
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-G801/3
Additional Forms of Magnetics Data: ANAL.REC,35MM FILM,DIGITAL MAG. TAPE
Gravity Instrumentation: NONE COLLECTED
Seismic Instrumentation: NONE COLLECTED
Topmost Latitude of Survey: -08
Bottommost Latitude: -44
Leftmost Longitude: +147
Rightmost Longitude: -149
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
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. SEABEAM AND MAGNETICS COLLECTED, IN ANCILLARY MODE. FOLLOWING INFO FROM MULTIBEAM BATHYMETRY: Heading Sensor, Sperry MK 23 Gyro; Vertical reference unit sensor Datawell Hippy Model 120; Navigation: Horizontal_Datum WGS84; Uncorrected meters, assumed SV 1500m/sec; Ship draft 5; Surface sound velocity sensor.
Number of Data Records: 25446
Min/Max Data Record:
Date: 1995 04 18
Latitude: -43.31560
Longitude: -179.99966
Bathymetry, 2- Way Traveltime: 000347
Bathymetry, Corrected Depth: 26.0
Magnetics Total Field, 1st Sensor: 334740
Magnetics Residual Field: -05511
Min/Max Data Record:
Date: 1995 05 05
Latitude: -7.99810
Longitude: +179.99725
Bathymetry, 2- Way Traveltime: 117240
Bathymetry, Corrected Depth: 9010.0
Magnetics Total Field, 1st Sensor: 624740
Magnetics Residual Field: +07652