Survey Identifier: VNTR02WT
Format Acronym: MGD77
Data Center File Number: 15040222
Parameters Surveyed Code: 55331
File Creation Date (yyyymmdd): 19
Source Institution: SCRIPPS INSTITUTION OF OCEANOGRAPHY
Country: USA
Platform Name: R/V T.WASHINGTON
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): J.BENDER, C. LANGMUIR
Project: VENTURE LEG 2
Funding: NSF
Survey Departure Date (yyyymmdd): 19891006
Port of Departure: MANZANILLO, MEXICO
Survey Arrival Date (yyyymmdd): 19891107
Port of Arrival: MANZANILLO, MEXICO
Navigation Instrumentation: SATNAV/GPS,AUTO LOG GYRO+2D DOPPLER SPD
Geodetic Datum/Position: LINEAR INTERP.BETWEEN ADJACENT FIXES
Bathymetry Instrumentation: SEABEAM VERTICAL BEAM (2&2/3 DEG) & 3.5
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 MAG. TAPE
Gravity Instrumentation: BELL BGM-3 METER
Additional Forms of Gravity Data: DIGITAL MAG TAPE
Seismic Instrumentation: NONE COLLECTED
Topmost Latitude of Survey: +20
Bottommost Latitude: +08
Leftmost Longitude: -106
Rightmost Longitude: -103
General Digitizing Rate of Bathymetry: 010
General Sampling Rate of Bathymetry: 1PING IN H2O
Assumed Sound Velocity: 15000
Interpolation Scheme: 1 MINUTE AVERAGES EXTRACTED FROM SEABEAM VERTICAL BEAMS
General Digitizing Rate of Magnetics: 010
General Sampling Rate of Magnetics: 06
Reference Field Code: 03
Reference Field: IGRF-1985
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: 9795355
Departure Base Station Description: SIO MAR FAC PIER SITE "TWP"
Arrival Base Station Gravity: 9795355
Arrival Base Station Description: SIO MAR FAC PIER SITE "TWP" 1
Additional Documentation: NGDC has multibeam bathymetric data for this cruise, however the tracklines, found here in GEODAS may not exactly correspond to the multibm data available. SYST_COMMENTS DEPTHS CORRECTED FOR 5 METER SHIP DRAFT, 12.158 kHz, 16 beams. Amatec-Straza 2-D Doppler speed log, Sperry MK-27 Gyro, Trimble GPS receiver, GRAVITY: 1 SEC METER COUNTS FILTERED WITH 25 POLE FILTER WITH 148 SEC DELAY. FREE AIR ANOMALY SPIKES PRESENT BECAUSE SAME FILTER NOT USED FOR NAVIGATION. GRAVITY NOT FUNDED SO ONLY COLLECTED, BUT NOT EDITED OR PROCESSED.
Number of Data Records: 44812
Min/Max Data Record:
Date: 1989 10 06
Latitude: +8.48515
Longitude: -105.49883
Bathymetry, 2- Way Traveltime: 001467
Bathymetry, Corrected Depth: 110.0
Magnetics Total Field, 1st Sensor: 353830
Magnetics Residual Field: -09676
Min/Max Data Record:
Date: 1989 11 07
Latitude: +19.07377
Longitude: -103.38316
Bathymetry, 2- Way Traveltime: 065253
Bathymetry, Corrected Depth: 4910.0
Magnetics Total Field, 1st Sensor: 423050
Magnetics Residual Field: +04833