Survey Identifier: AVON01MV
Format Acronym: MGD77
Data Center File Number: 15020187
Parameters Surveyed Code: 55511
File Creation Date (yyyymmdd): 20040507
Source Institution: SCRIPPS INSTITUTION OF OCEANOGRAPHY
Country: USA
Platform Name: R/V MELVILLE
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): PETER LONSDALE, SCRIPPS
Project: AVON EXPEDITION LEG 1
Funding: NSF
Survey Departure Date (yyyymmdd): 19990106
Port of Departure: SAN DIEGO, CALIFORNIA
Survey Arrival Date (yyyymmdd): 19990123
Port of Arrival: MAJURO, MARSHALL ISLANDS
Navigation Instrumentation: TRIMBLE TASMAN P(Y) GPS
Geodetic Datum/Position: LINEAR FIT TO 60 SEC FIXES
Bathymetry Instrumentation: SEABEAM 2000 w/SIDESCAN
Additional Forms of Bathymetric Data: ANAL.REC.,35MM FILM,DIGITAL MAG. TAPE
Magnetics Instrumentation: GEOMETRICS MAGNETOMETER MOD-G886
Additional Forms of Magnetics Data: DIGITAL TAPE
Gravity Instrumentation: BELL BGM-3 METER
Additional Forms of Gravity Data: DIGITAL TAPE
Topmost Latitude of Survey: 34
Bottommost Latitude: 07
Leftmost Longitude: 171
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 VALUES EXTRACTED FROM SEABEAM VERTICAL BEAM
General Digitizing Rate of Magnetics: 010
General Sampling Rate of Magnetics: 06
Reference Field Code: 03
Reference Field: IGRF-1995
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: 979535.
Departure Base Station Description: 5SIO MARFAC PIER, SAN DIEGO,CA
Arrival Base Station Gravity: 978319.
Arrival Base Station Description: 14SHOP.CNTR,MAJURO,MARSHALL I.
Additional Documentation: PROCESSED BY GEOLOGICAL DATA CENTER, SCRIPPS INSTITUTION OF OCEANOGRAPHY, DEPTHS CORRECTED FOR 5 METER SHIP DRAFT; GRAVITY: 1 SEC METER COUNTS FILTERED, WITH 99 SEC STD.DEV.CAUSSIAN CONV. WINDOW; FREE AIR ANOMALY SPIKES MAY BE, BECAUSE SAME FILTER NOT USED FOR NAV. 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: 23420
Min/Max Data Record:
Date: 1999 01 06
Latitude: +7.08599
Longitude: -179.99984
Bathymetry, 2- Way Traveltime: 000307
Bathymetry, Corrected Depth: 23.0
Magnetics Total Field, 1st Sensor: 375060
Magnetics Residual Field: -05047
Observed Gravity: 9781782
Free-Air Anomaly: -0471
Min/Max Data Record:
Date: 1999 01 22
Latitude: +33.87935
Longitude: +179.99769
Bathymetry, 2- Way Traveltime: 084987
Bathymetry, Corrected Depth: 6444.0
Magnetics Total Field, 1st Sensor: 507280
Magnetics Residual Field: +34187
Observed Gravity: 9794472
Free-Air Anomaly: +2520