Survey Identifier: HT8501

Format Acronym: MGD77
Data Center File Number: J1010008
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): KATSUMASA KEDO
Funding: HYDROGRAPHIC DEP
Survey Departure Date (yyyymmdd): 19850522
Port of Departure: TOKYO
Survey Arrival Date (yyyymmdd): 19850629
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: +23
Leftmost Longitude: +137
Rightmost Longitude: +141
General Digitizing Rate of Bathymetry: 10/
General Sampling Rate of Bathymetry: SECOND
Assumed Sound Velocity: 15000
General Digitizing Rate of Magnetics: 134
General Sampling Rate of Magnetics: 60
Magnetic Sensor Tow Distance: 0266
Reference Field Code: 88
Reference Field: DGRF1980
General Digitizing Rate of Gravity: 134
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:56060008
Number of Data Records: 4043

Min/Max Data Record:
Date: 1985 05 22
Latitude: +23.20683
Longitude: +137.39483
Bathymetry, Corrected Depth: 1570.0
Magnetics Residual Field: -02420
Free-Air Anomaly: -0300

Min/Max Data Record:
Date: 1985 06 29
Latitude: +27.03850
Longitude: +140.10266
Bathymetry, Corrected Depth: 9999.0
Magnetics Residual Field: +03380
Free-Air Anomaly: +0870