Overview

The Geospatial Information Authority of Japan (GSI; 国土地理院, Kokudo Chiri-in) is Japan's national agency responsible for surveying, mapping and maintaining geodetic infrastructure. It operates under the Ministry of Land, Infrastructure, Transport and Tourism and is headquartered in Tsukuba, Ibaraki Prefecture. The agency produces official topographic maps, digital geospatial data and reference systems used across government, science, industry and public life. For more about its mapping remit see mapping and survey and for general information on Japan see Japan.

Primary functions and products

GSI's work covers the full spectrum of national geospatial services. Core activities include:

  • Establishing and maintaining the national geodetic network and coordinate reference systems, including GNSS reference stations;
  • Producing and updating topographic maps and digital elevation models in a variety of scales and formats;
  • Conducting aerial photography and remote sensing surveys to support land use planning, environmental monitoring and infrastructure development;
  • Providing online map services, downloadable spatial datasets and geospatial standards for public and private use.

History and organization

The institution has roots in government surveying offices dating back to earlier modernizations of Japan's land administration, and it was formally known from 1949 until May 2010 as the "Geographical Survey Institute." Since reorganizing under its current name, GSI has modernized many services and expanded digital offerings. The authority's main offices are located in Tsukuba City; information about the city and prefecture is available via Tsukuba and Ibaraki Prefecture.

Applications and public importance

GSI products and services support disaster risk reduction, infrastructure design, land administration, navigation and scientific research. During earthquakes, tsunamis and other disasters, GSI provides rapid geospatial updates, hazard maps and elevation data that assist emergency response and planning. Its public-facing platforms enable citizens and professionals to access maps, elevation profiles and historical aerial imagery.

Notable facts and distinctions

GSI operates one of the country's primary GNSS reference networks and sets national standards for coordinates and map datum. It collaborates with international mapping bodies and contributes to open geospatial data initiatives. While its technical remit is broad, the authority remains focused on accuracy, interoperability and providing authoritative geospatial information for Japan's governance and society.

Further resources

Official publications, datasets and service portals are maintained by GSI and are frequently updated to reflect new surveys and technological advances. For direct access to official materials and datasets, consult the agency's resources linked above.