Survey Identifier: NBP94-2
Format Acronym: MGD77
Data Center File Number: 88010006
Parameters Surveyed Code: 55550
File Creation Date (yyyymmdd): 19950829
Source Institution: LAMONT DOHERTY EARTH OBSERVATORY
Country: USA
Platform Name: NATHANIEL B. PALMER
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): STANLEY JACOBS
Project: NATHANIEL B. PALMER CRUISE: NBP94-2
Funding: NAT SCIENCE FNDN
Survey Departure Date (yyyymmdd): 19940214
Port of Departure: MCMURDO STATION ANTARCTICA
Survey Arrival Date (yyyymmdd): 19940405
Port of Arrival: PUNTA ARENAS CHILE
Navigation Instrumentation: ASHTECH GPS
Geodetic Datum/Position: PRIM-ASHTECH GPS,SEC-FURUNO GPS
Bathymetry Instrumentation: RAYTHEON ODEC 3.5 KHZ
Additional Forms of Bathymetric Data: ANALOG RECORDS
Magnetics Instrumentation: GRADIOMETER GEOMETRICS 811
Additional Forms of Magnetics Data: DIGITAL RECORDS, ANALOG RECORDS
Gravity Instrumentation: LACOSTE AND ROMBERG S-36
Additional Forms of Gravity Data: DIGITAL RECORDS ONLY
Topmost Latitude of Survey: -52
Bottommost Latitude: -79
Leftmost Longitude: +165
Rightmost Longitude: -061
General Digitizing Rate of Bathymetry: 010
General Sampling Rate of Bathymetry: 1/SECOND
Assumed Sound Velocity: 15000
Bathymetric Datum Code: 00
General Digitizing Rate of Magnetics: 010
General Sampling Rate of Magnetics: 01
Magnetic Sensor Tow Distance: 750
Sensor Depth: 010
Horizontal Sensor Separation: 100
Reference Field Code: 88
Reference Field: IGRF-90
Method of Applying Residual Field: POINT FOR POINT CALCULATION
General Digitizing Rate of Gravity: 100
General Sampling Rate of Gravity: 10
Theoretical Gravity Formula Code: 3
Theoretical Gravity Formula: IAG SYSTEM (0967)
Reference System Code: 3
Reference System: SYSTEM IGSN 71
Additional Documentation: DATA PROCESSED BY ANTARCTIC SUPPORT ASSOCIATES (ASA), NGDC FOUND MANY DEPTH ERRORS WHICH ASA ATTRIBUTED TO (1) ICEBREAKER SHIP, COLLECTING DATA WHILE BREAKING ICE, ALSO REFLECTIONS FROM ICE AND, (2) BATHYMETRY INSTRUMENTATION WAS HIGH FREQUENCY FISH FINDER WHICH DID NOT, WORK WELL AT DEPTHS GREATER THAN 3000 METERS. NGDC DELETED PORTIONS OF DATA WITH OBVIOUS DEPTH ERRORS.
Number of Data Records: 71834
Min/Max Data Record:
Date: 1994 02 14
Latitude: -78.01800
Longitude: -179.99000
Bathymetry, 2- Way Traveltime: 001330
Bathymetry, Corrected Depth: 100.0
Magnetics Total Field, 1st Sensor: 330536
Magnetics Residual Field: -34892
Observed Gravity: 9814994
Free-Air Anomaly: -5537
Min/Max Data Record:
Date: 1994 04 05
Latitude: -52.35180
Longitude: +179.99600
Bathymetry, 2- Way Traveltime: 039950
Bathymetry, Corrected Depth: 2952.0
Magnetics Total Field, 1st Sensor: 617915
Magnetics Residual Field: +25863
Observed Gravity: 9830052
Free-Air Anomaly: +1465