About¶

+

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

+

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.

+

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.

+

Citation¶

+

To cite PROJ in publications use:

+

+
PROJ contributors (2020). PROJ coordinate transformation software +library. Open Source Geospatial Foundation. URL https://proj.org/. +DOI: 10.5281/zenodo.5884394
+

+

A BibTeX entry for LaTeX users is

+

@Manual{,
+  title = {{PROJ} coordinate transformation software library},
+  author = {{PROJ contributors}},
+  organization = {Open Source Geospatial Foundation},
+  year = {2022},
+  url = {https://proj.org/},
+  doi = {10.5281/zenodo.5884394},
+}
+

+

+

License¶

+

PROJ uses the MIT license. The software was initially released by the USGS in +the public domain. When Frank Warmerdam took over the development of PROJ it +was moved under the MIT license. The full text of the license follows, and can +also be found in the file COPYING, at the top level of the source +distribution package.

+

+All source, data files and other contents of the PROJ package are 
+available under the following terms.  Note that the PROJ 4.3 and earlier
+was "public domain" as is common with US government work, but apparently
+this is not a well defined legal term in many countries. Frank Warmerdam placed
+everything under the following MIT style license because he believed it is
+effectively the same as public domain, allowing anyone to use the code as
+they wish, including making proprietary derivatives.
+
+Initial PROJ 4.3 public domain code was put as Frank Warmerdam as copyright
+holder, but he didn't mean to imply he did the work. Essentially all work was
+done by Gerald Evenden.
+
+Copyright information can be found in source files.
+
+ --------------
+
+ Permission is hereby granted, free of charge, to any person obtaining a
+ copy of this software and associated documentation files (the "Software"),
+ to deal in the Software without restriction, including without limitation
+ the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ and/or sell copies of the Software, and to permit persons to whom the
+ Software is furnished to do so, subject to the following conditions:
+
+ The above copyright notice and this permission notice shall be included
+ in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ DEALINGS IN THE SOFTWARE.
+

+

+

+ + +

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