Survey Identifier: HT98T411
Format Acronym: MGD77
Data Center File Number: J1010089
Parameters Surveyed Code: 55500
File Creation Date (yyyymmdd): 20011210
Source Institution: HYDROGRAPHIC DEPARTMENT
Country: JAPAN
Platform Name: TAKUYO
Platform Type Code: 1
Platform Type: SHIP
Project: 41TH AREA(FIRST)CONTINENTAL SHELF SURVEY
Funding: HYDROGRAPHIC DEPT.
Survey Departure Date (yyyymmdd): 19980423
Port of Departure: TOKYO,JAPAN
Survey Arrival Date (yyyymmdd): 19980518
Port of Arrival: TOKYO,JAPAN
Navigation Instrumentation: GPS
Geodetic Datum/Position: INTERGRATED NAVIGATON SYSTEM
Bathymetry Instrumentation: SEA-BEAM2112 BATHYMETRIC SYSTEM 12KHz
Magnetics Instrumentation: PROTON MAGNETOMETOR (PMM-100)
Gravity Instrumentation: MARINE GRAVITYMETER SYSTEM (KSS-30)
Topmost Latitude of Survey: 26
Bottommost Latitude: 24
Leftmost Longitude: 152
Rightmost Longitude: 156
General Digitizing Rate of Bathymetry: 100
Assumed Sound Velocity: 15000
Bathymetric Datum Code: 00
General Digitizing Rate of Magnetics: 100
General Sampling Rate of Magnetics: 60
Magnetic Sensor Tow Distance: 252
Horizontal Sensor Separation: 88
Reference Field Code: IG
Reference Field: RF-95
General Digitizing Rate of Gravity: 100
General Sampling Rate of Gravity: 05
Theoretical Gravity Formula Code: 3
Theoretical Gravity Formula: IAG System 1967
Reference System: JGSN75
Corrections Applied: DRIFT & EOTVOS CORRECTION
Departure Base Station Gravity: -9326
Departure Base Station Description: JHDGO(TOKYO PORT)
Arrival Base Station Gravity: -9320
Arrival Base Station Description: JHDGO(TOKYO PORT)
Additional Documentation: Corection for sound velocity was applied to the seabeam data using XBT data, and sound velocity data of JODC. The correction for time variations were carried out with the geomagnetic, variations at the Kanoya data of Magnetic Observatory,JMA. The correction for Drift and Eotvos were applied to the gravity data and, IAG System(1967) was carried out.
Number of Data Records: 1280
Min/Max Data Record:
Date: 1998 05 05
Latitude: +23.99883
Longitude: +152.47550
Bathymetry, Corrected Depth: 1910.0
Magnetics Residual Field: -06420
Free-Air Anomaly: -0370
Min/Max Data Record:
Date: 1998 05 14
Latitude: +25.85683
Longitude: +155.01733
Bathymetry, Corrected Depth: 5970.0
Magnetics Residual Field: +03370
Free-Air Anomaly: +1530