Albers equal-area conic 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. 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. The Albers projection is used by the United States Geological Survey and the United States Census Bureau. Most of the maps in the National Atlas of the United States use the Albers projection. It is also one of the standard projections used by the government of British Columbia, and the sole governmental projection for the Yukon. Snyder 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 R {displaystyle {R}} is the radius, λ {displaystyle lambda } is the longitude, λ 0 {displaystyle lambda _{0}} the reference longitude, φ {displaystyle varphi } the latitude, φ 0 {displaystyle varphi _{0}} the reference latitude and φ 1 {displaystyle varphi _{1}} and φ 2 {displaystyle varphi _{2}} the standard parallels: