Survey Identifier: HM7401
Format Acronym: MGD77
Data Center File Number: J1030009
Parameters Surveyed Code: 55513
File Creation Date (yyyymmdd): 19801222
Source Institution: HYDROGRAPHIC DEPT.
Country: JAPAN
Platform Name: MEIYO
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): TEI NAKAZIMA
Project: THE BASIC MAP OF SEA OF CONTINENTAL SHELVES
Survey Departure Date (yyyymmdd): 19740507
Port of Departure: TOKYO
Survey Arrival Date (yyyymmdd): 19740614
Port of Arrival: TOKYO
Navigation Instrumentation: LORAN-A,LORAN-C 9970-X,Y
Geodetic Datum/Position: LORAN-A,LORAN-C 9970-X,Y
Bathymetry Instrumentation: 50KHZ,BEAM-WIDTH 15-DEGREE*2
Additional Forms of Bathymetric Data: ANALOG RECORD
Magnetics Instrumentation: PROTON MAG
Additional Forms of Magnetics Data: TOTAL INTENSITY CHART 6338M
Gravity Instrumentation: TSSG-H1 SENSOR:P1
Additional Forms of Gravity Data: FREE AIR ANOMALY CHART 6338G
Seismic Instrumentation: AIR GUN
Formats of Seismic Data: ANALOG RECORD
Topmost Latitude of Survey: +38
Bottommost Latitude: +35
Leftmost Longitude: +133
Rightmost Longitude: +135
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: 06
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: 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: 9798250
Departure Base Station Description: SAKAIMINATO 34-32.7N,133-15.6E
Arrival Base Station Gravity: 9797700
Arrival Base Station Description: TOKYO 35-38.2N,135-46.5E JGSN75
Additional Documentation: CRUISE NAME:TOTTORI OKI, OBSERVERS:Y.YANAGI AND A.UCHIDA, REDUCTION AND COMPILATION OF GRAVITY DATA HAVE BEEN MADE BY Y.GANEKO,T.YANAGI, AND K.KUBO OF THE ASTRONOMICAL DIV,JHD. magnetics records follow bathy,grav. no times for mag OLD NGDC:56070009
Number of Data Records: 6414
Min/Max Data Record:
Date: 1974 05 15
Latitude: +35.29712
Longitude: +133.00495
Bathymetry, Corrected Depth: 42.0
Magnetics Total Field, 1st Sensor: 470000
Magnetics Residual Field: -08716
Observed Gravity: 9797652
Free-Air Anomaly: -0308
Min/Max Data Record:
Date: 1974 05 29
Latitude: +37.55362
Longitude: +134.74000
Bathymetry, Corrected Depth: 2350.0
Magnetics Total Field, 1st Sensor: 489500
Magnetics Residual Field: +09100
Observed Gravity: 9799781
Free-Air Anomaly: +0857