Survey Identifier: HT6501

Format Acronym: MGD77
Data Center File Number: J1010001
Parameters Surveyed Code: 53513
File Creation Date (yyyymmdd): 19801222
Source Institution: HYDROGRAPHIC DEPTARTMENT
Country: JAPAN
Platform Name: TAKUYO
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): ATUSHI TOKUHIRO
Project: UMP
Survey Departure Date (yyyymmdd): 19650421
Port of Departure: MAIZURU,KYOUTO
Survey Arrival Date (yyyymmdd): 19650522
Port of Arrival: TOKYO
Navigation Instrumentation: LORAN A.2S3.2S4
Geodetic Datum/Position: LORAN A.2S3.2S4
Bathymetry Instrumentation: 50KHZ,BEAM-WIDTH 15-DEGREE*2
Additional Forms of Bathymetric Data: ANALOG RECORD
Gravity Instrumentation: TSSG-H1,SENSOR:P1
Topmost Latitude of Survey: +42
Bottommost Latitude: +35
Leftmost Longitude: +133
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 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: 9798070
Departure Base Station Description: MAIZURU
Arrival Base Station Gravity: 9799520
Arrival Base Station Description: TOKYO
Additional Documentation: CRUISE NAME:YAMATO TAI, OBSERVER:ATSUSHI TOKUHIRO, TAKESHI YANAGI, VALUES OF GRAVITY BY TSSG WERE COMPARED WITH KNOWN VALUES OF GRAVITY AT TWO, STATIONS, TOKYO AND MAIZURU. REDUCTION AND COMPILATION OF GRAVITY DATA HAVE BEEN MADE BY K. SUGIMOTO AND, T. YANAGI OF THE ASTRONOMICAL DIVISION. CONVERSION POSTSDAM SYSTEM INTO, IGSN 71 SYSTEM HAS BEEN CARRIED OUT BY Y. GANEKO. OLD NGDC:56060001
Number of Data Records: 347

Min/Max Data Record:
Date: 1965 05 07
Latitude: +35.79645
Longitude: +133.40530
Bathymetry, Corrected Depth: 60.0
Observed Gravity: 9797622
Free-Air Anomaly: -0883

Min/Max Data Record:
Date: 1965 05 18
Latitude: +41.08596
Longitude: +140.09961
Bathymetry, Corrected Depth: 2970.0
Observed Gravity: 9802852
Free-Air Anomaly: +0834