Survey Identifier: GLOR06MV
Format Acronym: MGD77
Data Center File Number: 15020153
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. NAAR
Project: GLORIA LEG 6
Funding: NSF OCE91-00522
Survey Departure Date (yyyymmdd): 19930322
Port of Departure: EASTER ISLAND, CHILE
Survey Arrival Date (yyyymmdd): 19930426
Port of Arrival: VALPARAISO, CHILE
Navigation Instrumentation: GPS TRIMBLE MOD. 4000AX
Geodetic Datum/Position: BEST FIT 2ND ORDER POLYNOMIAL CURVE
Bathymetry Instrumentation: SEABEAM 2000 w/ 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: -23
Bottommost Latitude: -34
Leftmost Longitude: -110
Rightmost Longitude: -071
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: 9796192
Arrival Base Station Description: DOD 301-4 VALPARAISO, CHILE
Additional Documentation: PROCESSED BY GEOLOGICAL DATA CENTER, SCRIPPS INSTITUTION OF OCEANOGRAPHY, DEPTHS CORRECTED FOR 5 METER SHIP DRAFT. NAVIGATION: DR BETWEEN 1 MINUTE, INTERVAL GPS FIXES. GPS PRESENT 24 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 MK23 Gyro; Vertical reference, unit sensor Datawell Hippy Model 120; Navigation: Horizontal_Datum WGS84.
Number of Data Records: 49803
Min/Max Data Record:
Date: 1993 03 22
Latitude: -33.55726
Longitude: -109.83108
Bathymetry, 2- Way Traveltime: 001107
Bathymetry, Corrected Depth: 83.0
Magnetics Total Field, 1st Sensor: 253450
Magnetics Residual Field: -11516
Observed Gravity: 9787874
Free-Air Anomaly: -1887
Min/Max Data Record:
Date: 1993 04 26
Latitude: -23.53525
Longitude: -71.61522
Bathymetry, 2- Way Traveltime: 078467
Bathymetry, Corrected Depth: 5928.0
Magnetics Total Field, 1st Sensor: 339200
Magnetics Residual Field: +07585
Observed Gravity: 9797031
Free-Air Anomaly: +1763