Survey Identifier: GLOR02MV
Format Acronym: MGD77
Data Center File Number: 15020134
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): K. Macdonald
Project: GLORIA LEG 2
Funding: OCE91-02183
Survey Departure Date (yyyymmdd): 19921105
Port of Departure: ACUPULCO,MEXICO
Survey Arrival Date (yyyymmdd): 19921210
Port of Arrival: EASTER ISLAND, CHILE
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: +17
Bottommost Latitude: -28
Leftmost Longitude: -117
Rightmost Longitude: -099
General Digitizing Rate of Bathymetry: 010
General Sampling Rate of Bathymetry: 1PING IN H2O
Assumed Sound Velocity: 15000
Interpolation Scheme: SEABEAM VERTICAL BEAM: FIRST POINT AFTER EACH MINUTE
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 Description: BACK INTERP. DOD 2080-9 TAHITI
Arrival Base Station Description: BACK INTERP. DOD 2080-9 TAHITI
Additional Documentation: DEPTHS CORRECTED FOR 5 METER SHIP DRAFT. 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; Ship draft 5; Surface sound velocity sensor.
Number of Data Records: 49870
Min/Max Data Record:
Date: 1992 11 05
Latitude: -27.22589
Longitude: -116.81147
Bathymetry, 2- Way Traveltime: 000880
Bathymetry, Corrected Depth: 66.0
Magnetics Total Field, 1st Sensor: 296400
Magnetics Residual Field: -06595
Observed Gravity: 9780059
Free-Air Anomaly: -1334
Min/Max Data Record:
Date: 1992 12 10
Latitude: +16.84632
Longitude: -99.88152
Bathymetry, 2- Way Traveltime: 072947
Bathymetry, Corrected Depth: 5504.0
Magnetics Total Field, 1st Sensor: 377960
Magnetics Residual Field: +07072
Observed Gravity: 9792514
Free-Air Anomaly: +1141