Survey Identifier: RAPA00WT


Format Acronym: MGD77
Data Center File Number: 15040225
Parameters Surveyed Code: 55513
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): S.M. SMITH
Project: RAPA LEG 0 (TEST TRIP)
Funding: U. C. SHIP FUNDS
Survey Departure Date (yyyymmdd): 19901104
Port of Departure: SAN DIEGO, CALIFORNIA
Survey Arrival Date (yyyymmdd): 19901105
Port of Arrival: SAN DIEGO, CALIFORNIA
Navigation Instrumentation: GPS,AUTO LOG GYRO+2D DOPPLER SPD
Geodetic Datum/Position: LINEAR INTERP.BETWEEN ADJACENT FIXES
Bathymetry Instrumentation: SEABEAM VERTICAL BEAM(2&2/3DEG),SEAMARC
Additional Forms of Bathymetric Data: ANAL.REC, DIGITAL MAG. TAPE
Magnetics Instrumentation: GEOMETRICS MAGNETOMETER MOD G-801/3
Additional Forms of Magnetics Data: DIGITAL MAG. TAPE
Gravity Instrumentation: BELL BGM-3 METER
Additional Forms of Gravity Data: DIGITAL MAG TAPE
Seismic Instrumentation: WATER GUN
Formats of Seismic Data: ANAL. REC, 35MM FILM
Topmost Latitude of Survey: +33
Bottommost Latitude: +32
Leftmost Longitude: -119
Rightmost Longitude: -117
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: 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: 795355S
Arrival Base Station Description: IO MAR FAC PIER SAN DIEGO
Additional Documentation: PROCESSED BY GEOLOGICAL DATA CENTER, SCRIPPS INSTITUTION OF OCEANOGRAPHY. SYST_COMMENTS DEPTHS CORRECTED FOR 5 METER SHIP DRAFT, 16 beams, 12.158 kHZ, time instrumentation = Hewlett-Packard HP-5065A rubidium frequency standard. 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. NAVI_INSTRU Amatec-Straza 2-D Doppler speed log, Sperry MK-27 Gyro, Trimble GPS Receiver, Mod 4000AX
Number of Data Records: 1918

Min/Max Data Record:
Date: 1990 11 04
Latitude: +32.34893
Longitude: -118.20459
Bathymetry, 2- Way Traveltime: 000533
Bathymetry, Corrected Depth: 40.0
Magnetics Total Field, 1st Sensor: 482740
Magnetics Residual Field: -00412
Observed Gravity: 9793799
Free-Air Anomaly: -1208

Min/Max Data Record:
Date: 1990 11 06
Latitude: +32.67484
Longitude: -117.22627
Bathymetry, 2- Way Traveltime: 026507
Bathymetry, Corrected Depth: 1966.0
Magnetics Total Field, 1st Sensor: 484270
Magnetics Residual Field: +01036
Observed Gravity: 9796236
Free-Air Anomaly: +0313