Survey Identifier: HT90T211
Format Acronym: MGD77
Data Center File Number: J1010042
Parameters Surveyed Code: 55533
File Creation Date (yyyymmdd): 19960327
Source Institution: HYDROGRAPHIC DEPARTMENT
Country: JAPAN
Platform Name: TAKUYO
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): HIRAO MASAYOSHI
Project: 21TH AREA(FIRST)CONTINENTAL SHELF SURVEY
Funding: HYDROGRAPHIC DEP
Survey Departure Date (yyyymmdd): 19900412
Survey Arrival Date (yyyymmdd): 19900501
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: +26
Bottommost Latitude: +20
Leftmost Longitude: +133
Rightmost Longitude: +136
General Digitizing Rate of Bathymetry: 10
General Digitizing Rate of Magnetics: 10
Magnetic Sensor Tow Distance: 314
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 Titisima data of Magnetic Observatory,JMA.
Number of Data Records: 2048
Min/Max Data Record:
Date: 1990 04 14
Latitude: +20.95983
Longitude: +133.29967
Bathymetry, Corrected Depth: 545.0
Magnetics Residual Field: -05900
Free-Air Anomaly: -0430
Min/Max Data Record:
Date: 1990 04 29
Latitude: +25.31617
Longitude: +135.72983
Bathymetry, Corrected Depth: 6240.0
Magnetics Residual Field: +04700
Free-Air Anomaly: +1100