Survey Identifier: HT8401

Format Acronym: MGD77
Data Center File Number: J1010004
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): 19840416
Port of Departure: TOKYO
Survey Arrival Date (yyyymmdd): 19840426
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: +28
Bottommost Latitude: +24
Leftmost Longitude: +130
Rightmost Longitude: +135
General Digitizing Rate of Bathymetry: 10/
General Sampling Rate of Bathymetry: SECOND
Assumed Sound Velocity: 15000
General Digitizing Rate of Magnetics: 103
General Sampling Rate of Magnetics: 60
Magnetic Sensor Tow Distance: 0266
Reference Field Code: 88
Reference Field: DGRF1980
General Digitizing Rate of Gravity: 114
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:56060004
Number of Data Records: 1258

Min/Max Data Record:
Date: 1984 04 16
Latitude: +24.00016
Longitude: +130.08666
Bathymetry, Corrected Depth: 116.0
Magnetics Residual Field: -03570
Free-Air Anomaly: -1150

Min/Max Data Record:
Date: 1984 04 26
Latitude: +27.06966
Longitude: +134.58200
Bathymetry, Corrected Depth: 9999.0
Magnetics Residual Field: +03640
Free-Air Anomaly: +1840