A projected coordinate system is composed of a geographic coordinate system and a map projection together. Projected coordinate systems (PCS) are planar systems that use linear measurements for the coordinates rather than angular units. The location of data is expressed as positive or negative numbers: positive x- and y-values for north of the equator and east of the prime meridian and negative values for south of the equator and west of the prime meridian.ĭownload the list of supported geographic and vertical coordinate systems. Geographic coordinate systems (GCS) are based on a three-dimensional ellipsoidal or spherical surface, and locations are defined using angular measurements, usually in decimal degrees, measuring degrees of longitude (x-coordinates) and degrees of latitude (y-coordinates). You can determine which type of coordinate system your data uses by examining the layer's properties. Horizontal coordinate systems can be of three types: geographic, projected, or local. Horizontal coordinate systems locate data across the surface of the earth, and vertical coordinate systems locate the relative height or depth of data. Coordinate systemsĭata is defined in both horizontal and vertical coordinate systems. Identifying this measurement system is the first step to choosing a coordinate system that displays your data in its correct position in ArcGIS Pro, in relation to your other data. The coordinates can be specified in many ways, such as decimal degrees, feet, meters, or kilometers any form of measurement can be used as a coordinate system. These numbers are part of a coordinate system that provides a frame of reference for your data to locate features on the surface of the earth, to align your data relative to other data, to perform spatially accurate analysis, and to create maps.Īll spatial data is created in a coordinate system, whether it is points, lines, polygons, rasters, or annotation. Spatial data is similar, but it also includes numerical information that allows you to position it on earth. Data usually comprises an array of numbers.
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