You cannot define a vertical coordinate system if the x,y coordinate system is unknown. It is not possible to georeference a feature associated with a UCS. M, or measure, values do not have a coordinate system.įor a spatial reference that includes an unknown coordinate system (UCS), you specify a tolerance only. Learn more about vertical coordinate systems A vertical coordinate system includes a geodetic or vertical datum, a linear unit of measure, an axis direction, and a vertical shift. A vertical coordinate system (VCS) georeferences z-values, most commonly used to denote elevation. A projected coordinate system (PCS) consists of a linear unit of measure (usually meters or feet), a map projection, the specific parameters used by the map projection, and a geographic coordinate system.Ī projected or geographic coordinate system can have a vertical coordinate system as an optional property. A geographic coordinate system (GCS) is defined by a datum, an angular unit of measure (usually degrees), and a prime meridian. X,y coordinates are georeferenced with a geographic or projected coordinate system. The spatial reference includes a coordinate system for x-, y-, and z-values as well as tolerance and resolution values for x-, y-, z-, and m-values. You define a spatial reference when creating a geodatabase feature dataset or stand-alone feature class. A spatial reference describes where features are located in the real world.
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