Survey Identifier: HT99T483

Format Acronym: MGD77
Data Center File Number: J1010102
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: 48TH AREA(THIRD)CONTINENTAL SHELF SURVEY
Funding: HYDROGRAPHIC DEPT.
Survey Departure Date (yyyymmdd): 19990419
Port of Departure: TOKYO,JAPAN
Survey Arrival Date (yyyymmdd): 19990511
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: 25
Bottommost Latitude: 20
Leftmost Longitude: 154
Rightmost Longitude: 158
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: -9080
Departure Base Station Description: JHDGO(TOKYO PORT)
Arrival Base Station Gravity: -9084
Arrival Base Station Description: JHDGO(TOKYO PORT)
Additional Documentation: Corection for sound velocity was applied to the seabeam data using XBT data, and statistics 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: 1638

Min/Max Data Record:
Date: 1999 04 22
Latitude: +20.91600
Longitude: +154.92083
Bathymetry, Corrected Depth: 1190.0
Magnetics Residual Field: -11410
Free-Air Anomaly: -0410

Min/Max Data Record:
Date: 1999 05 04
Latitude: +24.17117
Longitude: +157.60367
Bathymetry, Corrected Depth: 5680.0
Magnetics Residual Field: +03290
Free-Air Anomaly: +2460