Survey Identifier: HT91T252


Format Acronym: MGD77
Data Center File Number: J1010052
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): OKINO MUTUTO
Project: 23TH AREA(THIRD)CONTINENTAL SHELF SURVEY
Funding: HYDROGRAPHIC DEP
Survey Departure Date (yyyymmdd): 19911102
Survey Arrival Date (yyyymmdd): 19911119
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: +29
Bottommost Latitude: +26
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: 1276

Min/Max Data Record:
Date: 1991 11 04
Latitude: +26.98967
Longitude: +144.17050
Bathymetry, Corrected Depth: 668.0
Magnetics Residual Field: -05550
Free-Air Anomaly: -0160

Min/Max Data Record:
Date: 1991 11 17
Latitude: +28.82483
Longitude: +147.51283
Bathymetry, Corrected Depth: 6180.0
Magnetics Residual Field: +04670
Free-Air Anomaly: +2660