Survey Identifier: HT91T25A
Format Acronym: MGD77
Data Center File Number: J1010054
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: 25TH AREA(FIRST)CONTINENTAL SHELF SURVEY
Funding: HYDROGRAPHIC DEP
Survey Departure Date (yyyymmdd): 19910907
Survey Arrival Date (yyyymmdd): 19910924
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: +30
Bottommost Latitude: +26
Leftmost Longitude: +145
Rightmost Longitude: +146
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: 124
Min/Max Data Record:
Date: 1991 09 09
Latitude: +26.96317
Longitude: +145.59000
Bathymetry, Corrected Depth: 1110.0
Magnetics Residual Field: -05030
Free-Air Anomaly: -0090
Min/Max Data Record:
Date: 1991 09 10
Latitude: +29.91700
Longitude: +145.75000
Bathymetry, Corrected Depth: 6030.0
Magnetics Residual Field: +01630
Free-Air Anomaly: +2260