Development

These pages are primarily focused towards developers either contributing to the PROJ project or using the library in their own software.

• Development practices
• Quick start for C API usage
• Quick start for C++ API usage
• Error handling
• Reference
• Using PROJ in CMake projects
• Language bindings
• Version 4 to 6 API Migration
• Version 4 to 5 API Migration

The source code for PROJ is maintained in a git repository on GitHub. Additionally, a collection of PROJ-compatible transformation grids are maintained in a separate git repository.

Attention

The projects.h header and the functions related to it is considered deprecated from version 5.0.0 and onwards. The header has been removed PROJ in version 6.0.0 released February 1st 2019.

Attention

The nmake build system on Windows is on longer supported in version 6.0.0 on onwards. Use CMake instead.

Attention

The proj_api.h header and the functions related to it is considered deprecated from version 5.0.0 and onwards. The header has been removed in version 8.0.0 released March 1st 2021.

Attention

With the introduction of PROJ 5, behavioural changes has been made to existing functionality. Consult Known differences between versions for the details.