Survey Identifier: HS7603
Format Acronym: MGD77
Data Center File Number: J1020003
Parameters Surveyed Code: 55513
File Creation Date (yyyymmdd): 19801031
Source Institution: HYDROGRAPHIC DEPT.
Country: JAPAN
Platform Name: SHOYO
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): MITSUNAGA NAGASHIMA
Project: THE BASIC MAP OF SEA OF CONTINENTAL SHELVES
Survey Departure Date (yyyymmdd): 19760604
Port of Departure: TOKYO,JAPAN
Survey Arrival Date (yyyymmdd): 19760713
Port of Arrival: TOKYO,JAPAN
Navigation Instrumentation: LORAN-A 2H5.2S7,LORAN-C 9970-X.Y.Z,NNSS
Geodetic Datum/Position: LORAN-A 2H5.2S7,LORAN-C 9970-X.Y.Z
Bathymetry Instrumentation: 50KHZ,BEAM-WIDTH 15-DEGREE*2
Additional Forms of Bathymetric Data: ANALOG RECORD
Magnetics Instrumentation: PROTON MAG-KOKUSAI DENSHI CO. PMM-611G
Additional Forms of Magnetics Data: TOTAL INTENSITY CHART6510M,6511M,6512M
Gravity Instrumentation: TSSG-H2 SENSOR:P2.P3
Additional Forms of Gravity Data: GRAVITY ANOMALY CHART6510G,6511G,6512G
Seismic Instrumentation: AIR-GUN
Formats of Seismic Data: ANALOG RECORD
Topmost Latitude of Survey: +26
Bottommost Latitude: +23
Leftmost Longitude: +123
Rightmost Longitude: +127
General Digitizing Rate of Bathymetry: 100
General Sampling Rate of Bathymetry: 1/SECOND
Assumed Sound Velocity: 15000
Bathymetric Datum Code: 07
General Digitizing Rate of Magnetics: 050
General Sampling Rate of Magnetics: 60
Magnetic Sensor Tow Distance: 0250
Reference Field Code: 03
Reference Field: IGRF-65
Method of Applying Residual Field: DIURNAL CORR USING OBSERVATORY DATA
General Digitizing Rate of Gravity: 100
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 35-28.2N,139-46.5E
Arrival Base Station Gravity: 9797700
Arrival Base Station Description: TOKYO 35-28.2N,139-46.5E
Additional Documentation: CRUISE NAME:MIYAKO OKI, OBSERVER:SHINICHI KANAZAWA, TOKYO 979770 MGAL 35-28.2N,139-46.5E JGSN75, NAHA 979109 MGAL 26-14.0N,127-40.6E JGSN75, REDUCTION AND COMPILATION OF GRAVITY DATA HAVE BEEN MADE BY Y.GANEKO,T.YANAGI, AND A.NISISITA OF THE ASTRONOMICAL DIVISION. magnetics records follow bathy,grav. no times for mag OLD NGDC:56080003
Number of Data Records: 7896
Min/Max Data Record:
Date: 1976 06 07
Latitude: +23.80337
Longitude: +123.61112
Bathymetry, Corrected Depth: 32.0
Magnetics Total Field, 1st Sensor: 433500
Magnetics Residual Field: -01723
Observed Gravity: 9787475
Free-Air Anomaly: -1265
Min/Max Data Record:
Date: 1976 07 09
Latitude: +25.20909
Longitude: +126.69041
Bathymetry, Corrected Depth: 3480.0
Magnetics Total Field, 1st Sensor: 443000
Magnetics Residual Field: +03504
Observed Gravity: 9790608
Free-Air Anomaly: +1391