When you plan a project that uses spatial data, you need to determine whether the data should be based on one of the coordinate systems that are registered to the Spatial Extender catalog. If none of these coordinate systems meet your requirements, you can create one that does. This discussion explains the concept of coordinate systems and introduces the tasks of selecting one to use and creating a new one.
- Coordinate systems
A coordinate system is a framework for defining the relative locations of things in a given area; for example, an area on the earth's surface or the earth's surface as a whole. - Geographic coordinate systems
A*geographic coordinate system*uses a three-dimensional spherical surface to determine locations on the earth. Any location on earth can be referenced by a point with longitude and latitude coordinates. - Projected coordinate systems
A*projected coordinate system*is a flat, two-dimensional representation of the Earth. It is based on a sphere or spheroid geographic coordinate system, but it uses linear units of measure for coordinates, so that calculations of distance and area are easily done in terms of those same units. - Determine what coordinate system to use
A first step in planning a project is to determine what coordinate system to use.
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