PROJ¶

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PROJ is a generic coordinate transformation software that transforms geospatial +coordinates from one coordinate reference system (CRS) to another. This +includes cartographic projections as well as geodetic transformations. PROJ +is released under the X/MIT open source license

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PROJ includes command line applications for easy conversion of +coordinates from text files or directly from user input. In addition to the +command line utilities PROJ also exposes an +application programming interface, or API in short. The API +lets developers use the functionality of PROJ in their own software without having +to implement similar functionality themselves.

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PROJ started purely as a cartography application letting users convert geodetic +coordinates into projected coordinates using a number of different cartographic +projections. Over the years, as the need has become apparent, support for datum +shifts has slowly worked its way into PROJ as well. Today PROJ supports more +than a hundred different map projections and can transform coordinates between +datums using all but the most obscure geodetic techniques.

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You can download the source code for PROJ on the download section +and find links to prepackaged executables in the +installation section.

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In addition to this website the PROJ documentation is also available in PDF +form.

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