Support for Cylindrical Equal Area Projection

[winwaed]

Projection for the support of the Cylindrical Equal Area projection. This is actually a group of projections which include the Behrmann and Gall-Peters Projections. Implemented for ​http://www.equal-area-maps.com - a demonstration site that is under development and will be documented at ​http://www.geowebguru.com.

Current implementation is for spherical Earth models only. Commented code has been included for the forward ellipsoidal transformation. The maths for the inverse ellipsoidal transformation is beyond me and is not implemented - hence the forward transform is commented, and can be enabled when a suitable inverse transform can be found or derived.

Projection header description:

NAME LAMBERT CYLINDRICAL EQUAL AREA

PURPOSE: Transforms input longitude and latitude to Easting and

Northing for the Lambert Cylindrical Equal Area projection. This class of projection includes the Behrmann and Gall-Peters Projections. The longitude and latitude must be in radians. The Easting and Northing values will be returned in meters.

[winwaed]

cea.js Cylindrical Equal Area projection implementation file.

[winwaed]

I agree to release this patch under the LGPL license as a part of the Proj4Js Project.

• Richard Marsden

[madair]

added at rev #1613

Thanks!