Survey Identifier: HS8001

Format Acronym: MGD77
Data Center File Number: J1020021
Parameters Surveyed Code: 51511
File Creation Date (yyyymmdd): 19830727
Source Institution: HYDROGRAPHIC DEPARTMENT
Country: JAPAN
Platform Name: SHOYO
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): TAKEHIKO TAKEMURA
Funding: HYDROGRAPHIC DEP
Survey Departure Date (yyyymmdd): 19800221
Port of Departure: TOKYO
Survey Arrival Date (yyyymmdd): 19800321
Port of Arrival: TOKYO
Navigation Instrumentation: NNSS,LORAN-C 9970-X,Y
Geodetic Datum/Position: NNSS,LORAN-C 9970-X,Y
Bathymetry Instrumentation: 50KHZ,BEAM-WIDTH 15-DEGREE*2
Additional Forms of Bathymetric Data: ANALOG RECORD
Gravity Instrumentation: TSSG-H2 SENSOR:P2,P3
Topmost Latitude of Survey: +36
Bottommost Latitude: +32
Leftmost Longitude: +134
Rightmost Longitude: +140
General Digitizing Rate of Bathymetry: 100
General Sampling Rate of Bathymetry: 1/SECOND
Assumed Sound Velocity: 15000
Bathymetric Datum Code: 5
General Digitizing Rate of Gravity: 050
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 35-38.0N,139-46.7E
Arrival Base Station Gravity: 9797700
Arrival Base Station Description: TOKYO 35-38.0N,139-46.7E
Additional Documentation: CRUISE NAME:KII TOKAI OKI, OBSERVER:T.TAKEMURA AND A.NISISITA, TOKYO 979770 MGAL 35-38.0N,139-46.7E JGSN75, KOTI 979623 MGAL 33-32.2N,133-33.5E JGSN75, SIMIZU 979730 MGAL 35-00.4N,138-30.0E JGSN75, REDUCTION AND COMPILATION OF GRAVITY DATA HAVE BEEN MADE BY Y.GANEKO, Y.HARADA AND Y.KOMATU OF ASTRONOMICAL DIVISION OLD NGDC:56080021
Number of Data Records: 4226

Min/Max Data Record:
Date: 1980 02 21
Latitude: +32.36348
Longitude: +134.22520
Bathymetry, Corrected Depth: 20.0
Observed Gravity: 9794549
Free-Air Anomaly: -0942

Min/Max Data Record:
Date: 1980 03 21
Latitude: +35.63825
Longitude: +139.83963
Bathymetry, Corrected Depth: 4783.0
Observed Gravity: 9798106
Free-Air Anomaly: +1315