Survey Identifier: C2901
Format Acronym: MGD77
Data Center File Number: 01010288
Parameters Surveyed Code: 55513
File Creation Date (yyyymmdd): 19900218
Source Institution: LAMONT-DOHERTY GEOLOGICAL OBSERV./URI
Country: United States of A
Platform Name: R/V Robert D. Conrad
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): STEVEN CANDE and STEPHEN LEWIS
Funding: NSF
Survey Departure Date (yyyymmdd): 19880106
Port of Departure: VALPARAISO, CHILE
Survey Arrival Date (yyyymmdd): 19880210
Port of Arrival: PUNTA ARENAS, CHILE
Navigation Instrumentation: FURUNO,TRANSIT SATELLITE,GPS
Geodetic Datum/Position: FURUNO DR BETWEEN SAT FIXES
Bathymetry Instrumentation: GENERL INSTRMNTS SEABEAM CENTER BEAM
Additional Forms of Bathymetric Data: SWATH ALSO COLLECTED BY URI
Magnetics Instrumentation: VARIAN V75 MAGNETOMETER
Gravity Instrumentation: BELL AEROSPACE BGM-3 GRAVITY METER
Seismic Instrumentation: DIGICON DSS-240
Topmost Latitude of Survey: -32
Bottommost Latitude: -54
Leftmost Longitude: -077
Rightmost Longitude: -070
General Digitizing Rate of Bathymetry: 010
General Sampling Rate of Bathymetry: 1 each 6 sec
Assumed Sound Velocity: 15000
Bathymetric Datum Code: 00
Interpolation Scheme: LOGGED ALL CNTR BEAM,CLOSEST TO 0 SECS. INTERP
General Digitizing Rate of Magnetics: 010
General Sampling Rate of Magnetics: 20
Reference Field Code: 88
Reference Field: IGRF-85
Method of Applying Residual Field: BILINEAR INTERP IN 1 DEG SQUARE
General Digitizing Rate of Gravity: 010
General Sampling Rate of Gravity: 00
Theoretical Gravity Formula Code: 8
Theoretical Gravity Formula: INTERNATIONAL 80
Reference System Code: 2
Corrections Applied: +.0328 MGAL/DAY, DC +.57 MGAL
Departure Base Station Gravity: 9780300
Departure Base Station Description: NOAA SHIP BASE NO.2,MIAMI,1/7/87
Arrival Base Station Gravity: 9813262
Arrival Base Station Description: PORT ADMIN BLDG,P. ARENAS,2/13/
Additional Documentation: THEORETICAL GRAVITY FORMULA: Yo = 978.0327 * ( 1 + a - b ) where, a = .0053024 * sin( theta ) * sin( theta ), b = .0000058 * sin( 2 * theta ) * sin( 2 * theta ) . Although not indicated by a GEODAS trackline plot for bathymetry, additional, multibeam bathymetry is available between 39.453 and 41.073 degrees S. No, multibeam bathymetry available for this survey south of 48.285 degrees S. Navigation for the multibeam bathymetry was adjusted to match bathymetry
Number of Data Records: 50236
Min/Max Data Record:
Date: 1988 01 07
Latitude: -53.92482
Longitude: -76.76087
Bathymetry, 2- Way Traveltime: 000413
Bathymetry, Corrected Depth: 31.0
Magnetics Total Field, 1st Sensor: 259796
Magnetics Residual Field: -02610
Observed Gravity: 9795509
Free-Air Anomaly: -1534
Min/Max Data Record:
Date: 1988 02 10
Latitude: -32.95733
Longitude: -70.82263
Bathymetry, 2- Way Traveltime: 068173
Bathymetry, Corrected Depth: 5128.0
Magnetics Total Field, 1st Sensor: 343312
Magnetics Residual Field: +06363
Observed Gravity: 9813786
Free-Air Anomaly: +0811