Geographic Coordinate System

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A Geographic system is a latitude/longitude system defined in decimal degrees. Supported Geographic systems include:

  • NAD (North American Datum) 1927 and NAD 1988
  • 33 world ellipsoids and a user defined ellipsoid (i.e., Clarke 1866, WGS 1984, etc.)

The hemispheres are defined for non-NAD systems. The hemisphere cannot be changed for NAD systems (Northern, Western hemispheres).

Additional geographic coordinate systems can be added using the tools provided in the Horizontal Projection Dialog. New geographic coodinate systems can be imported from a file, or imputed directly.

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