Survey Identifier: L681NP
Format Acronym: MGD77
Data Center File Number: 06050055
Parameters Surveyed Code: 55500
File Creation Date (yyyymmdd): 19870617
Source Institution: USGS Branch of Pacific Marine Geology
Country: United States
Platform Name: Lee
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): Andy Stevenson
Survey Departure Date (yyyymmdd): 19810531
Port of Departure: LV NEWPORT,OREGON
Survey Arrival Date (yyyymmdd): 19810607
Port of Arrival: AR KODIAK,AK
Navigation Instrumentation: SATNAV,LORAN-C,SONAR DOPPLER
Geodetic Datum/Position: PRIM-SATNAV SEC-INTEGRATED NAV
Bathymetry Instrumentation: 12KHZ NARROW 1 SEC, 3.5 KHZ WIDE 1 SEC
Additional Forms of Bathymetric Data: RECORDER ROLLS
Magnetics Instrumentation: PROTON PRECESSION MAG-GEOMETRICS G-801
Additional Forms of Magnetics Data: ANALOG RECORDS
Gravity Instrumentation: L&R S-53
Additional Forms of Gravity Data: ANALOG RECORDS
Topmost Latitude of Survey: +57
Bottommost Latitude: +44
Leftmost Longitude: -148
Rightmost Longitude: -124
General Digitizing Rate of Bathymetry: 12
General Sampling Rate of Bathymetry: 20/SECONDS
Assumed Sound Velocity: 14630
General Digitizing Rate of Magnetics: 11
General Sampling Rate of Magnetics: 04
Magnetic Sensor Tow Distance: 213
Reference Field Code: 04
Reference Field: IGRF-75
Method of Applying Residual Field: LINEAR INTERP. BETWEEN NAV POINTS
General Digitizing Rate of Gravity: 11
General Sampling Rate of Gravity: 15
Theoretical Gravity Formula Code: 2
Theoretical Gravity Formula: INTERNAT, IAG1967
Reference System Code: 3
Reference System: SYSTEM IGSN-71
Corrections Applied: DRIFT CORRECTIONS
Departure Base Station Gravity: 9688486
Departure Base Station Description: NEWPORT OR MARINE SCI CENTER PIER
Arrival Base Station Gravity: 9688484
Arrival Base Station Description: KODIAK, AK COAST GUARD PIER
Number of Data Records: 8002
Min/Max Data Record:
Date: 1981 05 31
Latitude: +44.60095
Longitude: -147.12146
Bathymetry, 2- Way Traveltime: 021290
Bathymetry, Corrected Depth: 1578.0
Magnetics Total Field, 1st Sensor: 538980
Magnetics Residual Field: -05544
Observed Gravity: 9805813
Free-Air Anomaly: -0531
Min/Max Data Record:
Date: 1981 06 07
Latitude: +56.86295
Longitude: -124.04906
Bathymetry, 2- Way Traveltime: 056430
Bathymetry, Corrected Depth: 4213.0
Magnetics Total Field, 1st Sensor: 564190
Magnetics Residual Field: +10827
Observed Gravity: 9816899
Free-Air Anomaly: +0417