Survey Identifier: RAPA01WT
Format Acronym: MGD77
Data Center File Number: 15040226
Parameters Surveyed Code: 55531
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): K.MACDONALD
Project: RAPA LEG 1
Funding: ONR
Survey Departure Date (yyyymmdd): 19901115
Port of Departure: SAN DIEGO, CALIFORNIA
Survey Arrival Date (yyyymmdd): 19901215
Port of Arrival: MANZANILLO, MEXICO
Navigation Instrumentation: 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
Topmost Latitude of Survey: +33
Bottommost Latitude: +04
Leftmost Longitude: -118
Rightmost Longitude: -100
General Digitizing Rate of Bathymetry: 010
General Sampling Rate of Bathymetry: 1PING IN H20
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: 88
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: 9795355
Departure Base Station Description: SIO MAR FAC PIER SAN DIEGO 9
Arrival Base Station Gravity: 785815O
Arrival Base Station Description: CEANOGRAPHIC INST. MANZANILLO
Additional Documentation: PROCESSED BY GEOLOGICAL DATA CENTER, SCRIPPS INSTITUTION OF OCEANOGRAPHY, DEPTHS CORRECTED FOR 5 METER SHIP DRAFT. SEA MARC II SIDE SCAN ALSO COLLECTED, NAV.: DR CSE/SPD BETWEEN 10 MINUTE INTERVAL GPS FIXES. GPS PRESENT 23 HRS/DAY, 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 NAV.
Number of Data Records: 43009
Min/Max Data Record:
Date: 1990 11 15
Latitude: +4.71097
Longitude: -117.43760
Bathymetry, 2- Way Traveltime: 001413
Bathymetry, Corrected Depth: 106.0
Magnetics Total Field, 1st Sensor: 334810
Magnetics Residual Field: -11924
Observed Gravity: 9779930
Free-Air Anomaly: -1198
Min/Max Data Record:
Date: 1990 12 15
Latitude: +32.70683
Longitude: -100.53325
Bathymetry, 2- Way Traveltime: 076507
Bathymetry, Corrected Depth: 5781.0
Magnetics Total Field, 1st Sensor: 479670
Magnetics Residual Field: +14003
Observed Gravity: 9795741
Free-Air Anomaly: +0820