Survey Identifier: RAIT03WT
Format Acronym: MGD77
Data Center File Number: 15040188
Parameters Surveyed Code: 55511
File Creation Date (yyyymmdd): 19881201
Source Institution: SCRIPPS INSTITUTION OF OCEANOGRAPHY
Country: USA
Platform Name: R/V T.WASHINGTON
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): P. LONSDALE
Project: RAITT LEG 3
Survey Departure Date (yyyymmdd): 19880315
Port of Departure: MANZANILLO, MEXICO
Survey Arrival Date (yyyymmdd): 19880402
Port of Arrival: SAN DIEGO, CALIF.
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
Topmost Latitude of Survey: +33
Bottommost Latitude: +12
Leftmost Longitude: -125
Rightmost Longitude: -104
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: 9785096
Departure Base Station Description: DOD1753-2,ACAPULCO,MEXICO
Arrival Base Station Gravity: 9795353
Arrival Base Station Description: SIO MARFAC PIER, SAN DIEGO
Additional Documentation: DEPTHS CORRECTED FOR 5 METER SHIP DRAFT. GRAVITY: 1 SEC METER COUNTS FILTERED WITH 25 POLE FILTER WITH 180 SEC DELAY. FREE AIR SPIKES PRESENT AT CSE/SPD CHANGES BECAUSE NAVIGATION NOT FILTERED, SIMILARILY. GRAVITY COLLECTED ON WHOLE LEG BUT, AS OF NOV 1988, PROCESSED ONLY, FOR PERIOD 0250Z/20MAR88 - 0413Z/26MAR88 (DOWD SEAMOUNT SURVEY).
Number of Data Records: 25582
Min/Max Data Record:
Date: 1988 03 15
Latitude: +12.90719
Longitude: -124.40191
Bathymetry, 2- Way Traveltime: 004760
Bathymetry, Corrected Depth: 359.0
Magnetics Total Field, 1st Sensor: 363830
Magnetics Residual Field: -04253
Observed Gravity: 9781672
Free-Air Anomaly: -0813
Min/Max Data Record:
Date: 1988 04 02
Latitude: +32.21733
Longitude: -104.31666
Bathymetry, 2- Way Traveltime: 067693
Bathymetry, Corrected Depth: 5092.0
Magnetics Total Field, 1st Sensor: 481820
Magnetics Residual Field: +07106
Observed Gravity: 9785533
Free-Air Anomaly: +2025