Survey Identifier: DRFT07RR
Format Acronym: MGD77
Data Center File Number: 15390015
Parameters Surveyed Code: 51511
File Creation Date (yyyymmdd): 20020102
Source Institution: SCRIPPS INSTITUTION OF OCEANOGRAPHY
Country: USA
Platform Name: R/V Revelle
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): Erica Goetze
Project: Drift Cruise LEG 07
Funding: U.C. Ship Funds
Survey Departure Date (yyyymmdd): 20011216
Port of Departure: Easter Island
Survey Arrival Date (yyyymmdd): 20020102
Port of Arrival: Lyttleton, New Zealand
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: MAG. TAPE
Magnetics Instrumentation: None collected
Gravity Instrumentation: BELL BGM-3 Meter S/N224
Additional Forms of Gravity Data: MAG. TAPE
Seismic Instrumentation: None collected
Topmost Latitude of Survey: -27
Bottommost Latitude: -44
Leftmost Longitude: 172
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-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: 978297.
Departure Base Station Description: 8 DOD 0091-B Callao, Peru
Arrival Base Station Gravity: 980494.
Arrival Base Station Description: 2 DOD 0217-0 Christchurch,N.Z.
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: 23493
Min/Max Data Record:
Date: 2001 12 16
Latitude: -43.61300
Longitude: -179.99909
Bathymetry, 2- Way Traveltime: 001707
Bathymetry, Corrected Depth: 128.0
Observed Gravity: 9785633
Free-Air Anomaly: -0300
Min/Max Data Record:
Date: 2002 01 01
Latitude: -27.12873
Longitude: +179.99702
Bathymetry, 2- Way Traveltime: 074880
Bathymetry, Corrected Depth: 5650.0
Observed Gravity: 9805877
Free-Air Anomaly: +1712