Spatial data is data that can be located on earth using a coordinate system. There are different types of coordinate systems, such as geographic, projected, or local, that use different units and origins to measure the position of data. Horizontal coordinate systems are used for the surface of the earth, and vertical coordinate systems are used for the height or depth of data. WGS84 is a common datum that adjusts the coordinates over time.
WGS84 is defined and maintained by the United States National Geospatial-Intelligence Agency (NGA). It is consistent, to about 1cm, with the International Terrestrial Reference Frame (ITRF).
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