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Concept of the New Japanese Geodetic System



The new geodetic reference system for horizontal and vertical positioning adopted in 2002 in Japan will be described. The geodetic reference system, or "Japanese Geodetic Datum 2000", includes the geocentric geodetic system as the standard for measuring latitudes and longitudes, and the orthometric height system. The transition of the geodetic reference system was realized by an amendment of the Survey Act, which defines the standard for land surveying in Japan.


1. Introduction - Geodetic Reference System -
2. Horizontal Positioning
  2.1 References for Determining Latitude and Longitude
  2.2 Local Geodetic Reference System
  2.3 Global Geodetic Reference System
    2.3.1 ITRF
    2.3.2 WGS84
    2.3.3 Densification of the Geocentric Geodetic System
  2.4 Determination of Latitude and Longitude in Japan
    2.4.1 Realization of Tokyo Datum
    2.4.2 Geodetic Coordinates 2000:Realization of Geocentric Geodetic System
3. Vertical Positioning
  3.1 Tokyo Bay Mean Sea Level
  3.2 Definition of Geoid
  3.3 Vertical Reference System in Japan
  3.4 Ellipsoidal Height and Geoidal Height
4. Survey Act and Geodetic Reference System
  4.1 Scope of Survey Act
    4.1.1 Scope of Article 11 gSurvey Standardh
    4.1.2 Relationship of Survey Act and Hydrographical Operation Act with other Acts
  4.2 Representation of Position
  4.3 Distance and Area
  4.4 Origin Point
    4.4.1 Origin Point for Definition of Geodetic System
    4.4.2 Location of Origin Point
    4.4.3 Numerical values at the Origin Point
4.5 Definition of Geocentric Geodetic System

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