Albers projection
The Albers equal-area conic projection, or Albers projection (named after Heinrich C. Albers), is a conic, equal area map projection that uses two standard parallels. Although scale and shape are not preserved, distortion is minimal between the standard parallels.
![](../I/m/Albers_projection_SW.jpg)
![](../I/m/Albers_with_Tissot's_Indicatrices_of_Distortion.svg.png)
The Albers projection is used by the United States Geological Survey and the United States Census Bureau.[1] Most of the maps in the National Atlas of the United States use the Albers projection.[2] It is also one of the standard projections used by the government of British Columbia,[3] and the sole governmental projection for the Yukon.[4]
Formulas
For Sphere
Snyder[5] describes generating formulae for the projection, as well as the projection's characteristics. Coordinates from a spherical datum can be transformed into Albers equal-area conic projection coordinates with the following formulas, where is the radius, is the longitude, the reference longitude, the latitude, the reference latitude and and the standard parallels:
where
See also
References
- "Projection Reference". Bill Rankin. Archived from the original on 25 April 2009. Retrieved 2009-03-31.
- Snyder, John P. (1987). Map Projections – A Working Manual. U.S. Geological Survey Professional Paper 1395. Washington, D.C.: United States Government Printing Office. p. 2. Archived from the original on 2008-05-16. Retrieved 2017-08-28.
- "Support & Info: Common Questions". Geomatics Yukon. Government of Yukon. Retrieved 15 October 2014.
- Snyder, John P. (1987). "Chapter 14: ALBERS EQUAL-AREA CONIC PROJECTION". Map Projections – A Working Manual. U.S. Geological Survey Professional Paper 1395. Washington, D.C.: United States Government Printing Office. p. 100. Archived from the original on 2008-05-16. Retrieved 2017-08-28.
External links
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Wikimedia Commons has media related to Albers projection. |
- Mathworld's page on the Albers projection
- Table of examples and properties of all common projections, from radicalcartography.net
- An interactive Java Applet to study the metric deformations of the Albers Projection.