Survey Identifier: RNDB11WT
Format Acronym: MGD77
Data Center File Number: 15040216
Parameters Surveyed Code: 55533
File Creation Date (yyyymmdd): 19890324
Source Institution: SCRIPPS INSTITUTION OF OCEANOGRAPHY
Country: USA
Platform Name: R/V T.WASHINGTON
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): WINTERER,NATLAND,McNUTT,SAGER
Project: ROUNDABOUT LEG 11
Funding: NSF OCE87-02835
Survey Departure Date (yyyymmdd): 19881217
Port of Departure: MAJURO,MARSHALL IS.
Survey Arrival Date (yyyymmdd): 19881230
Port of Arrival: MAJURO, MARSHALL IS.
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: 80 CU IN H2O & 1900C-BOLT AIRGUN
Formats of Seismic Data: ANAL.REC.,35MM FILM,DIGITAL MAG TAPE
Topmost Latitude of Survey: +08
Bottommost Latitude: -01
Leftmost Longitude: +158
Rightmost Longitude: +172
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: 9783104
Departure Base Station Description: NE CORNER OF WALL E OF GIBSONS
Arrival Base Station Gravity: 9783104
Arrival Base Station Description: NE CORNER OF WALL E OF GIBSONS
Additional Documentation: SYST_COMMENTS DEPTHS CORRECTED FOR 5 METER SHIP DRAFT, 12.158 kHz, 16 beams. NAVI_INSTRU Amatec-Straza 2-D Doppler speed log, Sperry MK-27 Gyro, Multibm. header shows Winterer, Mayer(Dahl. U.), Shipley(UT) as chief sci. 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. NGDC has multibeam bathymetric data for this cruise, however the tracklines, found here in GEODAS do not exactly correspond to the multibm data available.
Number of Data Records: 19672
Min/Max Data Record:
Date: 1988 12 17
Latitude: -0.50467
Longitude: +158.48201
Bathymetry, 2- Way Traveltime: 004507
Bathymetry, Corrected Depth: 342.0
Magnetics Total Field, 1st Sensor: 331360
Magnetics Residual Field: -07010
Observed Gravity: 9779524
Free-Air Anomaly: -0441
Min/Max Data Record:
Date: 1988 12 30
Latitude: +7.29667
Longitude: +171.46803
Bathymetry, 2- Way Traveltime: 060280
Bathymetry, Corrected Depth: 4527.0
Magnetics Total Field, 1st Sensor: 371470
Magnetics Residual Field: +03564
Observed Gravity: 9784240
Free-Air Anomaly: +2500