Survey Identifier: TUNE07WT


Format Acronym: MGD77
Data Center File Number: 15040231
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): S. BLOOMER
Project: TUNES LEG 7
Funding: OCE91-02183
Survey Departure Date (yyyymmdd): 19911206
Port of Departure: APRA, GUAM
Survey Arrival Date (yyyymmdd): 19911227
Port of Arrival: APRA, GUAM
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)&3.5KHZ
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: DIGITAL MAG. TAPE
Gravity Instrumentation: BELL BGM-3 METER
Additional Forms of Gravity Data: DIGITAL MAG TAPE
Seismic Instrumentation: NONE COLLECTED
Topmost Latitude of Survey: +24
Bottommost Latitude: +13
Leftmost Longitude: +141
Rightmost Longitude: +146
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: 9785255
Departure Base Station Description: GUAM DOD0061-7
Arrival Base Station Gravity: 9785255
Arrival Base Station Description: GUAM DOD0061-7
Additional Documentation: PROCESSED BY GEOLOGICAL DATA CENTER, SCRIPPS INSTITUTION OF OCEANOGRAPHY, DEPTHS CORRECTED FOR 5 METER SHIP DRAFT. NGDC has multibeam bathymetric data, however GEODAS tracklines may not exactly correspond to this bathy data. 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. MEDIAN FILTER WITH 7.5 MINUTE WIDTH THEN APPLIED TO GRAVITY TO REMOVE SPIKES. GRAVITY COLLECTED ON WHOLE LEG. PROCESSED FOR ONLY DEC 8, 21 & 26.
Number of Data Records: 27646

Min/Max Data Record:
Date: 1991 12 06
Latitude: +12.99657
Longitude: +141.28581
Bathymetry, 2- Way Traveltime: 000533
Bathymetry, Corrected Depth: 40.0
Magnetics Total Field, 1st Sensor: 360200
Magnetics Residual Field: -07896
Observed Gravity: 9782806
Free-Air Anomaly: +0068

Min/Max Data Record:
Date: 1991 12 27
Latitude: +23.41591
Longitude: +145.00200
Bathymetry, 2- Way Traveltime: 075587
Bathymetry, Corrected Depth: 5712.0
Magnetics Total Field, 1st Sensor: 397810
Magnetics Residual Field: +04585
Observed Gravity: 9787475
Free-Air Anomaly: +0906