Survey Identifier: CRGN01WT
Format Acronym: MGD77
Data Center File Number: 15040172
Parameters Surveyed Code: 55533
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): E.L. WINTERER
Project: CROSSGRAIN LEG 1
Funding: NAVY-0720&UC GENERAL
Survey Departure Date (yyyymmdd): 19870217
Port of Departure: SAN DIEGO,CALIFORNIA
Survey Arrival Date (yyyymmdd): 19870325
Port of Arrival: PAPEETE,TAHITI
Navigation Instrumentation: SATNAV/GPS,AUTO LOG GYRO+2D DOPPLER SPD
Geodetic Datum/Position: LINEAR INTERP.BETWEEN ADJACENT FIXES
Bathymetry Instrumentation: SEABEAM VERT.BEAM(2&2/3DEG)&3.5KHZ(WIDE)
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: WATERGUN SOURCE, DIGITAL, 1 CHANNEL
Formats of Seismic Data: ANAL.REC,35MM FILM,DIGITAL MAG.TAPE
Topmost Latitude of Survey: +33
Bottommost Latitude: -18
Leftmost Longitude: -155
Rightmost Longitude: -117
General Digitizing Rate of Bathymetry: 010
General Sampling Rate of Bathymetry: 1PING IN H20
Assumed Sound Velocity: 15000
Bathymetric Datum Code: 00
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: 10
Theoretical Gravity Formula Code: 3
Theoretical Gravity Formula: IAG SYSTEM 1967
Reference System Code: 3
Reference System: IGSN-71
Departure Base Station Gravity: 9795363
Departure Base Station Description: SIO MARFAC PIER,SAN DIEGO
Arrival Base Station Gravity: 9786989
Arrival Base Station Description: PAPEETE DOD 2080-9
Additional Documentation: PROCESSED BY GEOLOGICAL DATA CENTER, SCRIPPS INSTITUTION OF OCEANOGRAPHY, SYST_COMMENTS DEPTHS CORRECTED FOR 5 METER SHIP DRAFT, 12.158 kHz, 16 beams, time instrumentation = Hewlett-Packard HP-5065A rubidium frequency standard, NAVI_INSTR Amatec-Straza 2-D Doppler speed log, Sperry MK-27 Gyro, Trimble GPS, GRAV. SPIKES AND STEPS PRESENT DUE TO RESIDUAL NAV. ERRS., GRAV REPROCES 11/88, NGDC has multibeam bathymetric data for this cruise, however the tracklines, found here in GEODAS may not exactly correspond to the multibeam data.
Number of Data Records: 52642
Min/Max Data Record:
Date: 1987 02 17
Latitude: -17.53816
Longitude: -154.14322
Bathymetry, 2- Way Traveltime: 004293
Bathymetry, Corrected Depth: 320.0
Magnetics Total Field, 1st Sensor: 318010
Magnetics Residual Field: -04643
Observed Gravity: 9776695
Free-Air Anomaly: -3859
Min/Max Data Record:
Date: 1987 03 25
Latitude: +32.64269
Longitude: -117.23500
Bathymetry, 2- Way Traveltime: 072613
Bathymetry, Corrected Depth: 5481.0
Magnetics Total Field, 1st Sensor: 483990
Magnetics Residual Field: +04356
Observed Gravity: 9796213
Free-Air Anomaly: +2173