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JGD2000 is the national surveying system of Japan officially adopted by the Geospatial Information Authority of Japan in April 2002, replacing the previous “Tokyo Datum”. The main purpose of its introduction is to enhance the coordination with the global GPS coordinate system. JGD2000 is based on the geocentric coordinate system (ITRF: International Terrestrial Reference Frame) with the center of the earth as the origin, thus achieving higher-precision measurement and GIS analysis capabilities.
JGD2000 mainly includes the following three data formats:
Using the GRS80 ellipsoid as the benchmark, using latitude and longitude to represent the point position, and recording the ellipsoid height as the elevation information.
Three-dimensional rectangular coordinates (ECEF coordinate system) with the center of the earth as the origin, often used in conjunction with global positioning systems such as GPS.
Widely used in mapping and civil engineering design in Japan. Japan is divided into 19 projection zones, and each area uses the corresponding reference point for projection conversion.
JGD2000 is the standard coordinate system used in almost all surveying, mapping, infrastructure design, disaster response, urban planning, and GIS analysis in Japan. The topographic maps and basic map information released by the Ministry of Land, Infrastructure, Transport and Tourism and local governments are based on JGD2000. At the same time, construction engineering companies, consulting agencies, universities, and research institutions also widely use this benchmark system in civil design, drone mapping, 3D modeling, smart city construction, etc. In addition, web map services such as “Geographical Information Institute Map” and many GIS platforms (such as OpenStreetMap) also provide data based on JGD2000. Faced with the growing demand for high-precision spatial information, JGD2000 has become an indispensable “spatial information foundation” in Japan.