Survey Identifier: HS7501
Format Acronym: MGD77
Data Center File Number: J1020001
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): 19750410
Port of Departure: TOKYO,JAPAN
Survey Arrival Date (yyyymmdd): 19750515
Port of Arrival: TOKYO,JAPAN
Navigation Instrumentation: LORAN-A 2H6.2H7.2S7,LORAN-C 9970-X.Y.Z
Geodetic Datum/Position: LORAN-A 2H6.2H7.2S7,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 CHART 6505M,6507M
Gravity Instrumentation: TSSG-H2,SENSOR:P2,P3
Additional Forms of Gravity Data: GRAVITY ANOMALY CHART 6505G,6507G
Seismic Instrumentation: AIR-GUN
Formats of Seismic Data: ANALOG RECORD
Topmost Latitude of Survey: +28
Bottommost Latitude: +26
Leftmost Longitude: +126
Rightmost Longitude: +130
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 CORRECTIONS USING DATA OF OBSERVATORY
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:OKINAWA OKI 1, OBSERVER:SHINICHI KANAZAWA, TOKYO 979770 MGAL 35-28.2N,139-46.5E JGSN75, NAHA 979109 MGAL 26-14.0N,127-40.6E JGSN75, NAZE 979252 MGAL 28-23.1N,129-29.9E JGSN75, GRAVITY REDUCTION BY T.YANAGI, K.MATUMOTO, A.NISISITA OF ASTONOMICAL DIV. magnetics records follow bathy,mag; no times for mag OLD NGDC:56080001
Number of Data Records: 7397
Min/Max Data Record:
Date: 1975 04 13
Latitude: +0.00027
Longitude: +0.00000
Bathymetry, Corrected Depth: 41.0
Magnetics Total Field, 1st Sensor: 399800
Observed Gravity: 9789972
Free-Air Anomaly: -0862
Min/Max Data Record:
Date: 1975 05 12
Latitude: +81.00111
Longitude: +129.51754
Bathymetry, Corrected Depth: 2430.0
Magnetics Total Field, 1st Sensor: 478900
Observed Gravity: 9792405
Free-Air Anomaly: +1145