Survey Identifier: HT89T202
Format Acronym: MGD77
Data Center File Number: J1010041
Parameters Surveyed Code: 55533
File Creation Date (yyyymmdd): 19960227
Source Institution: HYDROGRAPHIC DEPARTMENT
Country: JAPAN
Platform Name: TAKUYO
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): TAKANASHI MASAO
Project: 20TH AREA(SECOND)CONTINENTAL SHELF SURVEY
Funding: HYDROGRAPHIC DEP
Survey Departure Date (yyyymmdd): 19891128
Port of Departure: TOKYO,JAPAN
Survey Arrival Date (yyyymmdd): 19891219
Port of Arrival: TOKYO,JAPAN
Navigation Instrumentation: GPS/NNSS/LORAN-C
Geodetic Datum/Position: INTEGRATED NAVIGATION SYSTEM
Bathymetry Instrumentation: SEA-BEAM BATHYMETRIC SYSTEM 12KHZ
Magnetics Instrumentation: PROTON MAGUNETMETER (GM-123,PMM-100)
Gravity Instrumentation: ONBOARD GRAVIMETER SYSTEM (GMBH KSS/30)
Topmost Latitude of Survey: +34
Bottommost Latitude: +29
Leftmost Longitude: +131
Rightmost Longitude: +136
General Digitizing Rate of Bathymetry: 10
General Digitizing Rate of Magnetics: 10
Magnetic Sensor Tow Distance: 300
Reference Field Code: 12
General Digitizing Rate of Gravity: 10
Theoretical Gravity Formula Code: 3
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: Corection for sound velocity was applied to the seabeam data using tables for, the area No.53 in Echo-sounding Correction Tables NP 139 (Hydrographic Dept. UK,1980). The correction for time variations were carried out with the geomagnetic, variations at the Kanoya data of Magnetic Observatory,JMA.
Number of Data Records: 2354
Min/Max Data Record:
Date: 1989 11 30
Latitude: +29.99733
Longitude: +131.68450
Bathymetry, Corrected Depth: 117.0
Magnetics Residual Field: -04420
Free-Air Anomaly: -0680
Min/Max Data Record:
Date: 1989 12 18
Latitude: +33.15183
Longitude: +135.03933
Bathymetry, Corrected Depth: 4900.0
Magnetics Residual Field: +03800
Free-Air Anomaly: +0940