Survey Identifier: DRFT05RR
Format Acronym: MGD77
Data Center File Number: 15390014
Parameters Surveyed Code: 55511
File Creation Date (yyyymmdd): 20011101
Source Institution: SCRIPPS INSTITUTION OF OCEANOGRAPHY
Country: USA
Platform Name: R/V Revelle
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): David Chadwell
Project: Drift Cruise LEG 05
Funding: NSF
Survey Departure Date (yyyymmdd): 20010927
Port of Departure: Puerto Caldera, Costa Rica
Survey Arrival Date (yyyymmdd): 20011031
Port of Arrival: Callao, Peru
Navigation Instrumentation: TRIMBLE TASMAN P(Y) GPS
Geodetic Datum/Position: LINEAR FIT TO 60 SEC FIXES
Bathymetry Instrumentation: SEABEAM 2100 12kHz, w/SIDESCAN
Additional Forms of Bathymetric Data: ANAL.REC,35MM FILM,DIGITAL MAG. TAPE
Magnetics Instrumentation: GEOMETRICS 886
Additional Forms of Magnetics Data: DIGITAL TAPE
Gravity Instrumentation: BELL BGM-3 METER S/N224
Additional Forms of Gravity Data: DIGITAL TAPE
Topmost Latitude of Survey: 10
Bottommost Latitude: -14
Leftmost Longitude: -085
Rightmost Longitude: -077
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: 7DOD 0091-8Pt.Caldera,CostaRica
Arrival Base Station Gravity: 978297.
Arrival Base Station Description: 8DOD 0091-BCallao,Peru
Additional Documentation: PROCESSED BY SHIPBOARD TECHNICAL SUPPORT GROUP, SCRIPPS INSTITUTION, 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: 47315
Min/Max Data Record:
Date: 2001 09 28
Latitude: -13.53491
Longitude: -84.83115
Bathymetry, 2- Way Traveltime: 000173
Bathymetry, Corrected Depth: 13.0
Magnetics Total Field, 1st Sensor: 232840
Magnetics Residual Field: -30070
Observed Gravity: 9779126
Free-Air Anomaly: -1527
Min/Max Data Record:
Date: 2001 10 31
Latitude: +9.97086
Longitude: -77.14437
Bathymetry, 2- Way Traveltime: 080253
Bathymetry, Corrected Depth: 6073.0
Magnetics Total Field, 1st Sensor: 624420
Magnetics Residual Field: +61180
Observed Gravity: 9783802
Free-Air Anomaly: +0656