Survey Identifier: HT91T243

Format Acronym: MGD77
Data Center File Number: J1010050
Parameters Surveyed Code: 55533
File Creation Date (yyyymmdd): 19960307
Source Institution: HYDROGRAPHIC DEPARTMENT
Country: JAPAN
Platform Name: TAKUYO
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): HIRAO MASAYOSHI
Project: 24TH AREA(THIRD)CONTINENTAL SHELF SURVEY
Funding: HYDROGRAPHIC DEP
Survey Departure Date (yyyymmdd): 19911007
Survey Arrival Date (yyyymmdd): 19911024
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: +28
Bottommost Latitude: +23
Leftmost Longitude: +144
Rightmost Longitude: +148
General Digitizing Rate of Bathymetry: 10
General Digitizing Rate of Magnetics: 10
Magnetic Sensor Tow Distance: 314
Reference Field Code: 88
Reference Field: IGRF1990
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: 1473

Min/Max Data Record:
Date: 1991 10 10
Latitude: +23.70933
Longitude: +144.80300
Bathymetry, Corrected Depth: 458.0
Magnetics Residual Field: -08700
Free-Air Anomaly: -0610

Min/Max Data Record:
Date: 1991 10 21
Latitude: +27.05567
Longitude: +147.57367
Bathymetry, Corrected Depth: 5980.0
Magnetics Residual Field: +03560
Free-Air Anomaly: +2190