= Welcome to Proj4js = Proj4js is a !JavaScript library to transform point coordinates from one coordinate system to another, including datum transformations. This library is a port of both the [http://trac.osgeo.org/proj/ PROJ.4] and [http://edcftp.cr.usgs.gov/pub//software/gctpc GCTCP] C libraries to !JavaScript. Enabling these transformations in the browser allows geographic data stored in different projections to be combined in browser-based web mapping applications. Proj4js is a part of the [http://wiki.osgeo.org/wiki/MetaCRS MetaCRS] group of projects and uses the same MIT style license as PROJ.4. == Starting Points == * [https://github.com/proj4js/proj4js GitHub] -- Contribute to Proj4js on Github * [wiki:Download] -- Get Proj4js now! * [wiki:UserGuide] -- User documentation - how to use Proj4js * [wiki:Examples] -- Examples of Proj4js in use * [wiki:MailingList] -- Mailing lists and contact info * [wiki:DevGuide] -- Developer documentation * [wiki:Primer] -- Coordinate Systems Primer