Survey Identifier: HS7201
Format Acronym: MGD77
Data Center File Number: J1020004
Parameters Surveyed Code: 55513
File Creation Date (yyyymmdd): 19810911
Source Institution: HYDROGRAPHIC DEPT.
Country: JAPAN
Platform Name: SHOYO
Platform Type Code: 1
Platform Type: SHIP
Survey Departure Date (yyyymmdd): 19720522
Survey Arrival Date (yyyymmdd): 19720704
Topmost Latitude of Survey: +43
Bottommost Latitude: +40
Leftmost Longitude: +140
Rightmost Longitude: +144
General Digitizing Rate of Bathymetry: 212
General Digitizing Rate of Magnetics: 050
General Sampling Rate of Magnetics: 06
Magnetic Sensor Tow Distance: 250
Reference Field Code: 03
Reference Field: IGRF-65
Method of Applying Residual Field: DIURNAL CORRECTIONS USING OBSERVATORY DATA
General Digitizing Rate of Gravity: 212
Additional Documentation: magnetics records follow bath,grav; no times for mag OLD NGDC:56080004
Number of Data Records: 8508
Min/Max Data Record:
Date: 1972 06 12
Latitude: +40.12785
Longitude: +140.35285
Bathymetry, Corrected Depth: 33.0
Magnetics Total Field, 1st Sensor: 471300
Magnetics Residual Field: -05925
Observed Gravity: 9801102
Free-Air Anomaly: -2149
Min/Max Data Record:
Date: 1972 11 10
Latitude: +42.81183
Longitude: +144.07810
Bathymetry, Corrected Depth: 3090.0
Magnetics Total Field, 1st Sensor: 500500
Magnetics Residual Field: +11137
Observed Gravity: 9804672
Free-Air Anomaly: +1930