Survey Identifier: BMRG01MV


Format Acronym: MGD77
Data Center File Number: 15020152
Parameters Surveyed Code: 55513
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): J.ORCUTT
Project: BOOMERANG EXPEDITION LEG 1
Survey Departure Date (yyyymmdd): 19951015
Port of Departure: SAN DIEGO,CALIFORNIA
Survey Arrival Date (yyyymmdd): 19951123
Port of Arrival: PAPEETE,FR.POLYNESIA
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-G 801/3
Additional Forms of Magnetics Data: ANAL.REC, 35MM FILM, DIGITAL TAPE
Gravity Instrumentation: BELL BGM-3 METER
Additional Forms of Gravity Data: DIGITAL TAPE
Seismic Instrumentation: WATERGUN
Formats of Seismic Data: ANAL.REC, DIGITAL TAPE
Topmost Latitude of Survey: +33
Bottommost Latitude: -19
Leftmost Longitude: -150
Rightmost Longitude: -109
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: 9795352
Departure Base Station Description: SIO MAR FAC PIER, SAN DIEGO, CA
Arrival Base Station Gravity: 9786989
Arrival Base Station Description: DOD2080-9 PAPEETE, TAHITI
Additional Documentation: PROCESSED BY DAN SCHEIRER, R/V MELVILLE. FINAL MINOR PROCESSING BY SIO/GDC, DEPTHS CORRECTED FOR 5 METER SHIP DRAFT. NAVIGATION: DR BETWEEN 1 MINUTE, INTERVAL GPS FIXES. GPS: PCODE MODE BEFORE 0000Z 19NOV95; C/A MODE THEREAFTER. GRAVITY: 1 SEC METER COUNTS FILTERED WITH 99 SEC STD.DEV. GAUSSIAN CONV. WINDOW. FREE AIR ANOMALY SPIKES MAY BE PRESENT BECAUSE SAME FILTER NOT USED, FOR NAVIGATION, BUT MOST OF THESE WERE HAND-EDITED. FOLLOWING INFO FROM, MULTIBEAM BATHYMETRY: Navigation: Horizontal_Datum WGS84.
Number of Data Records: 55501

Min/Max Data Record:
Date: 1995 10 15
Latitude: -18.65811
Longitude: -149.74424
Bathymetry, 2- Way Traveltime: 001413
Bathymetry, Corrected Depth: 106.0
Magnetics Total Field, 1st Sensor: 300500
Magnetics Residual Field: -04129
Observed Gravity: 9779995
Free-Air Anomaly: -0714

Min/Max Data Record:
Date: 1995 11 23
Latitude: +32.70655
Longitude: -109.14333
Bathymetry, 2- Way Traveltime: 065133
Bathymetry, Corrected Depth: 4901.0
Magnetics Total Field, 1st Sensor: 346460
Magnetics Residual Field: +08752
Observed Gravity: 9795850
Free-Air Anomaly: +2050