Report of the Geodetic Works in Japan during the Period from January 1987 to December 1990

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Other Title
  • 1987～1990年間の日本の測地学研究事業報告〔英文〕
  • 1987 1990ネンカン ノ ニホン ノ ソクチガク ケンキュウ ジギョウ
  • NATIONAL REPORT TO THE XX GENERAL ASSEMBLY VIENNA, AUSTRIA 11-24 AUGUST 1991

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The Geographical Survey Institute (OS!) is responsible for the national fundamental survey which has been carried out for the past century as the basis for mapping and engineering works. Main purposes of the fundamental survey are, at present, to get information for the prediction of earthquakes, by resurveying control points and to establish control points for the area where large scale mapping or cadastral survey is planned. The geodetic fundamental survey comprises a number of surveys; precise horizontal geodetic survey, levelling and astronomical observation.

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