关于

PROJ是一个通用的坐标转换软件，它将地理空间坐标从一个坐标参考系（CRS）转换到另一个坐标参考系。这包括地图投影和大地坐标变换。项目在 X/MIT open source license

项目包括 command line applications 便于从文本文件或直接从用户输入转换坐标。除了命令行实用程序之外，PROJ还公开了 application programming interface ，简称API。API允许开发人员在自己的软件中使用PROJ的功能，而不必自己实现类似的功能。

PROJ一开始只是一个制图应用程序，允许用户使用许多不同的制图投影将大地坐标转换为投影坐标。多年来，随着需求的日益明显，对基准面偏移的支持也慢慢地进入了项目。如今，PROJ支持超过一百种不同的地图投影，并且可以使用除了最模糊的大地测量技术之外的所有其他技术在基准之间转换坐标。

引用

引用出版物中的项目：

项目贡献者(2020)。项目坐标转换软件库。开源地理空间基金会。网址https://proj.org/.DOI：10.5281/zenod.5884394

Btex BTA用户入口

@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},
}

许可

Proj使用麻省理工学院的执照。该软件最初是由美国地质调查局在公共领域发布的。当弗兰克·沃默丹接管Proj的开发时，它被转移到了麻省理工学院的许可证下。许可证全文如下，也可以在文件中找到 COPYING ，位于源代码分发包的顶层。

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.

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