The Geospatial Information Authority of Japan (GSI) is the national mapping and surveying agency under Japan’s Ministry of Land, Infrastructure, Transport and Tourism. Its official site organizes services for maps, aerial photographs, geographic surveys, and the position and surveying standards used across the country. It links to GSI Maps, fundamental geospatial data, the digital national base map, historical map collections, point-cloud information, and thematic maps. Its disaster-response section publishes agency information about earthquakes, heavy rain, typhoons, and volcanic activity, including crustal movement and damage mapping, while also linking to hazard maps, evacuation-site data, and flood visualization services. The portal also covers survey control points, surveying results and calculations, research and technical information, and procedures for using or requesting official survey products. It is therefore a broad entry point to Japan’s government mapping, geodesy, spatial-data, and disaster-information services, rather than a single map viewer.
