All-in-One Lightweight GIS Platform

OSGB36 is the UK national coordinate system, the full name is Ordnance Survey Great Britain 1936, and its EPSG code is 4277. This coordinate system is based on the Airy 1830 ellipsoid and was developed by the Ordnance Survey of the United Kingdom. It is the national datum for topographic surveying in the United Kingdom. In the fields of geographic information systems (GIS), cartography, and engineering surveying in the United Kingdom, OSGB36 has been widely used, providing a unified reference framework for geospatial data in the United Kingdom, allowing geographic data from different sources to be integrated and analyzed in the same coordinate system.

The 2000 coordinate system, namely the China Geodetic Coordinate System 2000 (CGCS2000 for short), is a new generation of geocentric coordinate system released by the National Administration of Surveying, Mapping and Geoinformation of China in 2008, replacing the Xi’an 1980 coordinate system. CGCS2000 adopts the standard of the International Terrestrial Reference Frame (ITRF) and is highly compatible with the WGS84 coordinate system (the earth coordinate reference system used worldwide). Its geodetic datum is based on the GRS80 ellipsoid (the 1980 International Reference Ellipsoid), with accurate geocentric positioning, and is suitable for various precise measurements and geographic information processing.

ITRF2014 is the latest version of the International Earth Reference Frame. It is built based on multi-technical integrated observation data, providing high-precision earth coordinates and motion parameters, and providing a unified benchmark for geological research, space activities and geodesy.

Geodetic Coordinate System 2002, also known as GCJ-02 or nonlinear confidentiality processing technology for topographic maps, is a coordinate system for geographic information systems developed by the China National Administration of Surveying, Mapping and Geoinformation in 2002. It is an encryption algorithm for longitude and latitude data. By adding random deviations, the real coordinates are encrypted into false coordinates to achieve the confidentiality of geographic information. The Mars coordinate system is widely used in domestic map services, such as Amap and Baidu Maps, which must use this coordinate system to encrypt geographic locations.