Survey Identifier: HM7201
Format Acronym: MGD77
Data Center File Number: J1030006
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): 19720511
Port of Departure: OTARU
Survey Arrival Date (yyyymmdd): 19720626
Port of Arrival: OTARU
Navigation Instrumentation: DECCA 9C/MP,LORAN-A.2S3.2S4
Geodetic Datum/Position: DECCA 9C/MP,LORAN-A.2S3.2S4
Bathymetry Instrumentation: 15KHZ,BEAM-WIDTH 15-DEGREE*2
Additional Forms of Bathymetric Data: ANALOG RECORD
Magnetics Instrumentation: PROTON MAG
Additional Forms of Magnetics Data: TOTAL INTENSITY CHART 6325M,6326M
Gravity Instrumentation: TSSG-H1,SENSOR:P1
Additional Forms of Gravity Data: FREE AIR ANOMALY CHART 6325G,6326G
Seismic Instrumentation: AIR GUN
Formats of Seismic Data: ANALOG RECORD
Topmost Latitude of Survey: +44
Bottommost Latitude: +41
Leftmost Longitude: +138
Rightmost Longitude: +141
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: 05
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: 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: 9805160
Departure Base Station Description: OTARU 42-12.2N,141-00.3E
Arrival Base Station Gravity: 9801830
Arrival Base Station Description: AKITA 39-45.0N,140-03.8
Additional Documentation: CRUISE NAME:HIYAMA OKI, OBSERVERS:K.MATSUMOTO AND A.NISISITA, HAKODATE:980390 MGAL 41-46.3N,140-42.9E, REDUCTION AND COMPILATION OF GRAVITY DATA HAVE BEEN MADE BY T.YANAGI, K.ONODERA AND K.KATSUNO OF THE ASTRONOMICAL DIV,JHD. CONVERSION POTSDAM INTI IGSN 71 HAS BEEN CARRIED OUT BY Y. GANEKO. magnetics records follow bathymetry and gravity; no times for magnetics.
Number of Data Records: 5808
Min/Max Data Record:
Date: 1972 06 13
Latitude: +40.49596
Longitude: +138.32807
Bathymetry, Corrected Depth: 46.0
Magnetics Total Field, 1st Sensor: 483000
Magnetics Residual Field: -09748
Observed Gravity: 9802142
Free-Air Anomaly: -0898
Min/Max Data Record:
Date: 1972 09 23
Latitude: +43.85731
Longitude: +140.58898
Bathymetry, Corrected Depth: 3680.0
Magnetics Total Field, 1st Sensor: 508500
Magnetics Residual Field: +07072
Observed Gravity: 9805922
Free-Air Anomaly: +1158