Survey Identifier: L1280WF
Format Acronym: MGD77
Data Center File Number: 06050059
Parameters Surveyed Code: 55131
File Creation Date (yyyymmdd): 19870612
Source Institution: USGS Branch of Pacific Marine Geology
Country: United States
Platform Name: Lee
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): Bill Normark
Funding: U.S. DEPT. INTERIOR
Survey Departure Date (yyyymmdd): 19801029
Port of Departure: ASTROIA, WASHINGTON
Survey Arrival Date (yyyymmdd): 19801113
Port of Arrival: REDWOOD CITY, CALIF.
Navigation Instrumentation: SATNAV,LORAN-C,DOPPLAR SONAR
Geodetic Datum/Position: PRIM-SATNAV, SEC-INTEGRATED NAV
Bathymetry Instrumentation: 12KHZ WIDE 1 SEC, 3.5KHZ 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
Seismic Instrumentation: SINGLE CHANNEL SEISMICS
Topmost Latitude of Survey: +47
Bottommost Latitude: +36
Leftmost Longitude: -131
Rightmost Longitude: -123
General Digitizing Rate of Bathymetry: 9
General Sampling Rate of Bathymetry: 20/SECONDS
Assumed Sound Velocity: 14630
Bathymetric Datum Code: 00
Interpolation Scheme: NO INTERPOLATION; DATA INTERVAL 1-5 MIN. W/INFLECTIONS
General Digitizing Rate of Magnetics: 053
General Sampling Rate of Magnetics: 04
Magnetic Sensor Tow Distance: 750
Reference Field Code: 04
Reference Field: IGRF-75
Method of Applying Residual Field: LINEAR INTERP. BETWEEN NAV. PTS. (AVG.309M)
Additional Documentation: DATA DIGITIZED MANUALLY BY USGS UNDER CONRACT TO DEFENSE MAPPING AGENCY, HYDROGRAPHIC/TOPOGRAPHIC CENTER. ALL DATA DIGITIZED FROM ANALOG RECORDS. DIGITIZING INTERVAL VARIABLE, DEPENDING UPON GRADIENTS, BUT SAMPLES SHOUL, BE RECORDED AT LEAST EVERY 5 MNUTES, WITH INFLECTION PTS. FOR INFORMATION REGARDING DATA, CONACT: GRAIG MCHENDRIE, USGS, (415) 856-7147 FTS 467-7147
Number of Data Records: 5221
Min/Max Data Record:
Date: 1980 10 29
Latitude: +36.60505
Longitude: -130.77482
Bathymetry, Corrected Depth: 2076.9
Magnetics Total Field, 1st Sensor: 491130
Magnetics Residual Field: -07284
Min/Max Data Record:
Date: 1980 11 13
Latitude: +46.17410
Longitude: -123.70733
Bathymetry, Corrected Depth: 4413.5
Magnetics Total Field, 1st Sensor: 548570
Magnetics Residual Field: +14659