Digital Atlas of Oklahoma

Map projection

The Albers Equal Area map projection is used for the data sets on both discs. This projection is appropriate for maps of the conterminous United States because of the visual presentation and equal-area characteristic, which facilitates areal analysis. This projection frequently is used for nationwide digital map data sets. The projection is cast on the North American Datum of 1983. The following table provides map projection information.

This projection slightly distorts shapes and distances (scale) in order to maintain equal-area properties. Scale is true along the standard parallels, which are to the north and south of Oklahoma. Scale distortion in Oklahoma reaches a maximum of slightly less than one percent at the northern border of the state.

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Albers Equal Area projection parameters.

[GRS1980, Geodetic Reference System 1980; NAD83, North American Datum 1983]

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Projection parameters:

   Spheroid                            GRS1980
   Datum                               NAD83
   First standard parallel             29 30 00 North
   Second standard parallel            45 30 00 North
   Central meridian                    96 00 00 West
   Latitude of projection origin       23 00 00 North

Coordinate system parameters:

   False easting                       0
   False northing                      0
   Planimetric units of measure        meters
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