Survey Identifier: HS7502
Format Acronym: MGD77
Data Center File Number: J1020011
Parameters Surveyed Code: 55513
File Creation Date (yyyymmdd): 19810220
Source Institution: HYDROGRAPHIC DEPARTMENT
Country: JAPAN
Platform Name: SHOYO
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): DAISAKU NISIHASI
Project: THE BASIC MAP OF SEA OF CONTINENTAL SHELVES
Funding: HYDROGRAPHIC DEP
Survey Departure Date (yyyymmdd): 19750530
Port of Departure: TOKYO
Survey Arrival Date (yyyymmdd): 19750708
Port of Arrival: TOKYO
Navigation Instrumentation: LORAN-A 2S0.2S2.LORAN-C 9970-X.Y.W,NNSS
Geodetic Datum/Position: LORAN-A 2S0.2S2,LORAN-C9970-X.Y.W,NNSS
Bathymetry Instrumentation: 50KHZ,BEAM-WIDTH 15-DEGREE*2
Additional Forms of Bathymetric Data: ANALOG RECORD
Magnetics Instrumentation: PROTON MAG
Gravity Instrumentation: TSSG-H2,SENSOR:P2,P3
Seismic Instrumentation: AIR-GUN
Formats of Seismic Data: ANALOG RECORD
Topmost Latitude of Survey: +36
Bottommost Latitude: +33
Leftmost Longitude: +139
Rightmost Longitude: +143
General Digitizing Rate of Bathymetry: 088
General Digitizing Rate of Magnetics: 050
General Sampling Rate of Magnetics: 60
Magnetic Sensor Tow Distance: 0250
Reference Field Code: 03
Reference Field: DGRF
Method of Applying Residual Field: DIURNAL CORRECTION USING DATA OF OBSERVATORY
General Digitizing Rate of Gravity: 050
General Sampling Rate of Gravity: 00
Theoretical Gravity Formula Code: 3
Theoretical Gravity Formula: IAG SYSTEM(1967)
Reference System: SYSTEM JGSN75
Corrections Applied: DRIFT,ETOVOS
Departure Base Station Gravity: 9797700
Departure Base Station Description: TOKYO 35-38.2N,139-46.5E JGSN75
Arrival Base Station Gravity: 9797700
Arrival Base Station Description: TOKYO 35-38.2N,139-46.5E JGSN75
Additional Documentation: CRUISE NAME:BOSO OKI *magnetics follows bathy,grav with poor nav,no times. OBSERVER:KAORU KOYAMA(GRAVITY), HINODE,TOKYO : 979774 MGAL 35-38.9N,139-45.8E JGSN 75, YOKOHAMA SINKO NO.9: 979743 MGAL 35-27.2N,139-38.8E JGSN75, YOKOHAMA SINKO NO.4: 979742 MGAL 35-27.2N,139-38.8E JGSN75, REDUCTION AND COMPILATION OF GRAVITY DATA HAVE BEEN MADE BY Y.GANEKO, T.YANAGI AND A,NISISITA OF THE ASTRONOMICAL DIVISION. OLD NGDC:56080011
Number of Data Records: 9556
Min/Max Data Record:
Date: 1975 05 30
Latitude: +33.38402
Longitude: +139.72828
Bathymetry, Corrected Depth: 13.0
Magnetics Total Field, 1st Sensor: 441100
Magnetics Residual Field: -03215
Observed Gravity: 9793209
Free-Air Anomaly: -3187
Min/Max Data Record:
Date: 1975 07 07
Latitude: +35.18901
Longitude: +142.02811
Bathymetry, Corrected Depth: 9220.0
Magnetics Total Field, 1st Sensor: 455000
Magnetics Residual Field: +09569
Observed Gravity: 9798435
Free-Air Anomaly: +2104