Survey Identifier: DRFT02RR
Format Acronym: MGD77
Data Center File Number: 15390013
Parameters Surveyed Code: 51511
File Creation Date (yyyymmdd): 20010726
Source Institution: SCRIPPS INSTITUTION OF OCEANOGRAPHY
Country: USA
Platform Name: R/V Revelle
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): DR. SEAN KENNAN, FLORIDA
Project: Drift Cruise LEG 02
Funding: NSF
Survey Departure Date (yyyymmdd): 20010614
Port of Departure: San Diego, CA
Survey Arrival Date (yyyymmdd): 20010726
Port of Arrival: Pt. Caldera, Costa Rica
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
Gravity Instrumentation: BELL BMG-3 METER
Additional Forms of Gravity Data: DIGITAL MAG TAPE
Topmost Latitude of Survey: 33
Bottommost Latitude: 02
Leftmost Longitude: -118
Rightmost Longitude: -084
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 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: DOD0187-1 MARFAC PIER,S.D.
Arrival Base Station Gravity: 978217
Arrival Base Station Description: DOD4551-1PUNTARENAS,COSTA R.
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: 60416
Min/Max Data Record:
Date: 2001 06 14
Latitude: +2.21742
Longitude: -117.23626
Bathymetry, 2- Way Traveltime: 000427
Bathymetry, Corrected Depth: 32.0
Observed Gravity: 9779214
Free-Air Anomaly: -1176
Min/Max Data Record:
Date: 2001 07 26
Latitude: +32.70666
Longitude: -84.72438
Bathymetry, 2- Way Traveltime: 056840
Bathymetry, Corrected Depth: 4263.0
Observed Gravity: 9795355
Free-Air Anomaly: +0759