Survey Identifier: HS7405
Format Acronym: MGD77
Data Center File Number: J1020010
Parameters Surveyed Code: 55500
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): 19740905
Survey Arrival Date (yyyymmdd): 19741004
Magnetics Instrumentation: PROTON MAG
Topmost Latitude of Survey: +32
Bottommost Latitude: +29
Leftmost Longitude: +128
Rightmost Longitude: +131
General Digitizing Rate of Bathymetry: 114
General Digitizing Rate of Magnetics: 050
General Sampling Rate of Magnetics: 60
Magnetic Sensor Tow Distance: 250
Reference Field Code: 03
Reference Field: DGRF
Method of Applying Residual Field: DIURNAL CORRECTIONS USING OBSERVATORY DATA
General Digitizing Rate of Gravity: 114
Additional Documentation: magnetics records follow bathy,grav. no times for mag OLD NGDC:56080010
Number of Data Records: 8229
Min/Max Data Record:
Date: 1974 09 05
Latitude: +29.74643
Longitude: +128.63958
Bathymetry, Corrected Depth: 50.0
Magnetics Total Field, 1st Sensor: 449600
Magnetics Residual Field: -04228
Observed Gravity: 9792149
Free-Air Anomaly: -0889
Min/Max Data Record:
Date: 1974 10 04
Latitude: +31.24704
Longitude: +130.90419
Bathymetry, Corrected Depth: 1820.0
Magnetics Total Field, 1st Sensor: 469200
Magnetics Residual Field: +10841
Observed Gravity: 9795063
Free-Air Anomaly: +1164