Survey Identifier: HT92T271

Format Acronym: MGD77
Data Center File Number: J1010059
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: 27TH AREA(FIRST)CONTINENTAL SHELF SURVEY
Funding: HYDROGRAPHIC DEP
Survey Departure Date (yyyymmdd): 19920815
Survey Arrival Date (yyyymmdd): 19920901
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: +31
Bottommost Latitude: +27
Leftmost Longitude: +147
Rightmost Longitude: +151
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: 1765

Min/Max Data Record:
Date: 1992 08 17
Latitude: +27.88367
Longitude: +147.22767
Bathymetry, Corrected Depth: 2020.0
Magnetics Residual Field: -04080
Free-Air Anomaly: -0320

Min/Max Data Record:
Date: 1992 08 30
Latitude: +30.21700
Longitude: +150.07917
Bathymetry, Corrected Depth: 6300.0
Magnetics Residual Field: +02590
Free-Air Anomaly: +1260