Survey Identifier: DRFT16RR


Format Acronym: MGD77
Data Center File Number: 15390022
Parameters Surveyed Code: 55511
File Creation Date (yyyymmdd): 20020521
Source Institution: SCRIPPS INSTITUTION OF OCEANOGRAPHY
Country: USA
Platform Name: R/V Revelle
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): Peter Lonsdale, SCRIPPS INST.
Project: Drift Cruise LEG 15
Funding: NSF
Survey Departure Date (yyyymmdd): 20020522
Port of Departure: Honolulu, Hawaii
Survey Arrival Date (yyyymmdd): 20020530
Port of Arrival: San Diego, California
Navigation Instrumentation: TRIMBLE TASMAN P(Y) GPS
Geodetic Datum/Position: LINEAR FIT TO 60 SEC FIXES
Bathymetry Instrumentation: SIMRAD EM120 multibeam
Additional Forms of Bathymetric Data: DIGITAL MAG TAPE
Magnetics Instrumentation: GEOMETRICS 886
Additional Forms of Magnetics Data: DIGITAL MAG TAPE
Gravity Instrumentation: BELL BGM-6 S/N228
Additional Forms of Gravity Data: DIGITAL MAG TAPE
Seismic Instrumentation: NONE COLLECTED
Topmost Latitude of Survey: 33
Bottommost Latitude: 21
Leftmost Longitude: -158
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-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: 978923.
Departure Base Station Description: 6Snug Harbor, Sand Is. Honolulu
Arrival Base Station Gravity: 979535.
Arrival Base Station Description: 5MARFAC PIER, San Diego, Calif.
Additional Documentation: PROCESSED BY SHIPBOARD COMPUTER GROUP, 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
Number of Data Records: 12733

Min/Max Data Record:
Date: 2002 05 22
Latitude: +21.20792
Longitude: -157.88623
Bathymetry, 2- Way Traveltime: 000733
Bathymetry, Corrected Depth: 55.0
Magnetics Total Field, 1st Sensor: 357070
Magnetics Residual Field: -05079
Observed Gravity: 9785056
Free-Air Anomaly: -1375

Min/Max Data Record:
Date: 2002 05 30
Latitude: +32.71931
Longitude: -117.16014
Bathymetry, 2- Way Traveltime: 084880
Bathymetry, Corrected Depth: 6435.0
Magnetics Total Field, 1st Sensor: 450040
Magnetics Residual Field: +07910
Observed Gravity: 9795758
Free-Air Anomaly: +2164