Survey Identifier: DRFT13RR
Format Acronym: MGD77
Data Center File Number: 15390019
Parameters Surveyed Code: 55511
File Creation Date (yyyymmdd): 20020420
Source Institution: SCRIPPS INSTITUTION OF OCEANOGRAPHY
Country: USA
Platform Name: R/V Revelle
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): J. Hildebrand
Project: Drift Cruise LEG 13
Funding: NSF & STATE
Survey Departure Date (yyyymmdd): 20020401
Port of Departure: Hilo, Hawaii
Survey Arrival Date (yyyymmdd): 20020420
Port of Arrival: Honolulu, Hawaii
Navigation Instrumentation: TRIMBLE TASMAN P(Y) GPS
Geodetic Datum/Position: LINEAR FIT TO 60 SEC FIXES
Bathymetry Instrumentation: SIMRAD Multibeam
Additional Forms of Bathymetric Data: DIGITAL MAG. TAPE
Magnetics Instrumentation: GEOMETRICS 886
Additional Forms of Magnetics Data: DIGITAL TAPE
Gravity Instrumentation: BELL BGM-6 SN228-loan from NAVO
Additional Forms of Gravity Data: DIGITAL MAG TAPE
Topmost Latitude of Survey: 22
Bottommost Latitude: 18
Leftmost Longitude: -158
Rightmost Longitude: -154
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: 980494.
Departure Base Station Description: 0 DOD0217-0 CHRISTCHURCH
Arrival Base Station Gravity: 978923.
Arrival Base Station Description: 6 DOD0259-J HONOLULU
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: 27044
Min/Max Data Record:
Date: 2002 04 02
Latitude: +18.54031
Longitude: -157.88947
Bathymetry, 2- Way Traveltime: 000707
Bathymetry, Corrected Depth: 53.0
Magnetics Total Field, 1st Sensor: 342990
Magnetics Residual Field: -04446
Observed Gravity: 9784018
Free-Air Anomaly: -1045
Min/Max Data Record:
Date: 2002 04 20
Latitude: +21.31622
Longitude: -154.42384
Bathymetry, 2- Way Traveltime: 071720
Bathymetry, Corrected Depth: 5409.0
Magnetics Total Field, 1st Sensor: 356110
Magnetics Residual Field: +09058
Observed Gravity: 9789563
Free-Air Anomaly: +2505