Survey Identifier: HT8403
Format Acronym: MGD77
Data Center File Number: J1010006
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): TAKUJI OGINO
Funding: HYDROGRAPHIC DEP
Survey Departure Date (yyyymmdd): 19841014
Port of Departure: TOKYO
Survey Arrival Date (yyyymmdd): 19841119
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: +31
Bottommost Latitude: +23
Leftmost Longitude: +122
Rightmost Longitude: +128
General Digitizing Rate of Bathymetry: 10/
General Sampling Rate of Bathymetry: SECOND
Assumed Sound Velocity: 15000
General Digitizing Rate of Magnetics: 119
General Sampling Rate of Magnetics: 60
Magnetic Sensor Tow Distance: 0266
Reference Field Code: 88
Reference Field: DGRF1980
General Digitizing Rate of Gravity: 116
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:56060006
Number of Data Records: 4441
Min/Max Data Record:
Date: 1984 10 14
Latitude: +23.98066
Longitude: +122.52450
Bathymetry, Corrected Depth: 78.0
Magnetics Residual Field: -04440
Free-Air Anomaly: -1960
Min/Max Data Record:
Date: 1984 11 19
Latitude: +30.03833
Longitude: +127.58650
Bathymetry, Corrected Depth: 9999.0
Magnetics Residual Field: +04050
Free-Air Anomaly: +0960