Survey Identifier: HT8402
Format Acronym: MGD77
Data Center File Number: J1010005
Parameters Surveyed Code: 55511
File Creation Date (yyyymmdd): 19871007
Source Institution: HYDROGRAPHIC DEPARTMENT
Country: JAPAN
Platform Name: TAKUYO
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): TADAHIKO KATSURA
Funding: HYDROGRAPHIC DEP
Survey Departure Date (yyyymmdd): 19840622
Port of Departure: TOKYO
Survey Arrival Date (yyyymmdd): 19840703
Port of Arrival: TOKYO
Navigation Instrumentation: SAT/LORAN-C
Bathymetry Instrumentation: SEABEAM BATHYMETRIC SYSTEM 12KHZ
Additional Forms of Bathymetric Data: ANALOG RECORDS
Magnetics Instrumentation: PROTON PRECESSION MAGNETOMETER
Additional Forms of Magnetics Data: ANALOG RECORDS
Formats of Seismic Data: 1CH-ANALOG 12CH-DIGITAL
Topmost Latitude of Survey: +29
Bottommost Latitude: +23
Leftmost Longitude: +122
Rightmost Longitude: +125
General Digitizing Rate of Bathymetry: 10/
General Sampling Rate of Bathymetry: SECOND
Assumed Sound Velocity: 15000
General Digitizing Rate of Magnetics: 116
General Sampling Rate of Magnetics: 60
Magnetic Sensor Tow Distance: 0266
Reference Field Code: 88
Reference Field: DGRF1980
General Digitizing Rate of Gravity: 102
General Sampling Rate of Gravity: 60
Theoretical Gravity Formula Code: 3
Theoretical Gravity Formula: IAG SYSTEM(1967)
Reference System: JGSN 75
Departure Base Station Gravity: 9797783
Departure Base Station Description: JHDGO(TOKYO PORT)
Arrival Base Station Gravity: 9797783
Arrival Base Station Description: JHDGO(TOKYO PORT)
Additional Documentation: GRAVITY INSTRUMENTATION / GRAVIMETER KSS/30-BODENSEEWERK GEOSYSTEM, SEISMIC INSTRUMENTATION / 466 OR 352-CUIN. AIRGUN 1 OR 12 CHANNELS, *RESIDUAL MAG ONLY, NO TOTAL FIELD*, OLD NGDC:56060005
Number of Data Records: 1516
Min/Max Data Record:
Date: 1984 06 22
Latitude: +23.98516
Longitude: +122.43250
Bathymetry, Corrected Depth: 29.0
Magnetics Residual Field: -02370
Free-Air Anomaly: -1930
Min/Max Data Record:
Date: 1984 07 03
Latitude: +28.13933
Longitude: +124.94833
Bathymetry, Corrected Depth: 9999.0
Magnetics Residual Field: +03150
Free-Air Anomaly: +1020