Survey Identifier: GLOR04MV


Format Acronym: MGD77
Data Center File Number: 15020136
Parameters Surveyed Code: 55531
File Creation Date (yyyymmdd): 19
Source Institution: SCRIPPS INSTITUTION OF OCEANOGRAPHY
Country: USA
Platform Name: R/V MELVILLE
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): D. SANDWELL
Project: GLORIA LEG 4
Survey Departure Date (yyyymmdd): 19930110
Port of Departure: PAPEETE, TAHITI
Survey Arrival Date (yyyymmdd): 19930203
Port of Arrival: PAPEETE, TAHITI
Navigation Instrumentation: GPS TRIMBLE MOD. 4000AX
Geodetic Datum/Position: BEST FIT 2ND ORDER POLYNOMIAL CURVE
Bathymetry Instrumentation: SEABEAM 2000 WITH SIDESCAN & 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, ANAL. REC.
Gravity Instrumentation: BELL BGM-3 METER
Additional Forms of Gravity Data: DIGITAL MAG TAPE
Seismic Instrumentation: NONE COLLECTED
Topmost Latitude of Survey: -13
Bottommost Latitude: -18
Leftmost Longitude: -150
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: 03
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: 9786989
Departure Base Station Description: DOD 2080-9 PAPEETE, TAHITI
Arrival Base Station Gravity: 9786989
Arrival Base Station Description: DOD 2080-9 PAPEETE, TAHITI
Additional Documentation: DEPTHS CORRECTED FOR 5 METER SHIP DRAFT. NAVIGATION: DR BETWEEN 1 MINUTE, INTERVAL GPS FIXES. GPS PRESENT 23+ HRS/DAY. GRAVITY: 1 SEC METER COUNTS, FILTERED WITH 99 DEC STD.DEV. GAUSSIAN CONVOLUTION WINDOW. FREE AIR ANOMALY, SPIKES PRESENT BECAUSE SAME FILTER NOT USED FOR NAVIGATION. FOLLOWING INFO, FROM MULTIBEAM BATHYMETRY: Heading Sensor Sperry MK 23 Gyro;Vertical reference, unit sensor Datawell Hippy Model 120; Navigation: Horizontal_Datum WGS84; Uncorrected meters, assumed SV 1500m/sec; Surface sound velocity sensor.
Number of Data Records: 34091

Min/Max Data Record:
Date: 1993 01 11
Latitude: -17.54087
Longitude: -149.62987
Bathymetry, 2- Way Traveltime: 000240
Bathymetry, Corrected Depth: 18.0
Magnetics Total Field, 1st Sensor: 316920
Magnetics Residual Field: -04183
Observed Gravity: 9782491
Free-Air Anomaly: -0788

Min/Max Data Record:
Date: 1993 02 03
Latitude: -13.33589
Longitude: -117.73860
Bathymetry, 2- Way Traveltime: 062893
Bathymetry, Corrected Depth: 4732.0
Magnetics Total Field, 1st Sensor: 367820
Magnetics Residual Field: +03348
Observed Gravity: 9787062
Free-Air Anomaly: +1920