Survey Identifier: G175EG
Format Acronym: MGD77
Data Center File Number: 06340003
Parameters Surveyed Code: 55555
File Creation Date (yyyymmdd): 1988 414
Source Institution: U.S.G.S.
Country: U.S.A.
Platform Name: CECIL H. GREEN
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): T.BRUNS
Funding: US DEPT. INTERIOR
Survey Departure Date (yyyymmdd): 19750626
Port of Departure: DUTCH HARBOR, ALASKA
Survey Arrival Date (yyyymmdd): 19750827
Port of Arrival: KODIAK, ALASKA
Navigation Instrumentation: GSTGEONAV/LORAN C/DOPPLER SONAR/INT.NAV
Geodetic Datum/Position: SATELLITE
Bathymetry Instrumentation: 50KHZ ROSS FATHOMETER, 400A
Additional Forms of Bathymetric Data: ANALOG,MICROFILM
Magnetics Instrumentation: VARIAN PROTON MAGNETOMETER, V4970
Gravity Instrumentation: LA COSTE ROMBERG SEA GRAVIMETER
Topmost Latitude of Survey: +61
Bottommost Latitude: +54
Leftmost Longitude: -163
Rightmost Longitude: -137
General Digitizing Rate of Bathymetry: 020
Assumed Sound Velocity: 14630
Bathymetric Datum Code: 00
General Digitizing Rate of Magnetics: 020
General Sampling Rate of Magnetics: 04
Magnetic Sensor Tow Distance: 213
Reference Field Code: 04
Reference Field: IGRF75
Method of Applying Residual Field: LINEAR INTERP. BETWEEN NAV FIXES (AVG:333M)
General Digitizing Rate of Gravity: 020
General Sampling Rate of Gravity: 20
Theoretical Gravity Formula Code: 2
Theoretical Gravity Formula: INTERNATIONAL'30
Reference System Code: 2
Reference System: POTSDAM SYSTEM
Additional Documentation: THE PERCENTAGE OF NAVIGATION FIXES LESS THAN 7 MIN. APART ARE AS FOLLOWS:, 54% BETWEEN 5 AND 6 MIN.; 46% BETWEEN 2 AND 5 MIN. THERE WERE 126 TIME, GAPS GREATER THAN 6 MIN. INTERPOLATION OF DATA WS DONE TO 2 MIN., BUT, WAS DISCONTINUED WHEN A TIME GAP OF 20 MIN. OR MORE WAS ENCOUNTERED. FOR INFORMATION REGARDING DATA, CONTACT: GRAIG MCHENDRIE, U.S.G.S. (415) 856-7147, FTS 8 467-7147
Number of Data Records: 67723
Min/Max Data Record:
Date: 1975 06 26
Latitude: +54.03103
Longitude: -162.65726
Bathymetry, Corrected Depth: 16.0
Magnetics Total Field, 1st Sensor: 507199
Magnetics Total Field, 2nd Sensor: 509820
Magnetics Residual Field: -04712
Observed Gravity: 9813546
Free-Air Anomaly: -0837
Seismic Line Number: 0
Seismic Shot-Point Number: 1
Min/Max Data Record:
Date: 1975 08 27
Latitude: +60.18864
Longitude: -137.14060
Bathymetry, Corrected Depth: 2763.3
Magnetics Total Field, 1st Sensor: 573794
Magnetics Total Field, 2nd Sensor: 568640
Magnetics Residual Field: +12012
Observed Gravity: 9819894
Free-Air Anomaly: +1484
Seismic Line Number: 533
Seismic Shot-Point Number: 8283