Dec 1, 2025 · PROJ is a generic coordinate transformation software that transforms geospatial coordinates from one coordinate reference system (CRS) to another. This includes cartographic …

Dec 1, 2025 · The simplest way to install PROJ on Windows is to use the OSGeo4W software distribution. OSGeo4W provides easy access to many popular open source geospatial software …

Dec 1, 2025 · If a proj-string does not contain +type=crs, then it is interpreted as a coordination operation / transformation. If creation of the transformation object fails, the function returns 0 and the …

Dec 1, 2025 · Geodetic transformation PROJ can do everything from the most simple projection to very complex transformations across many reference frames.

Dec 1, 2025 · This section is devoted to the generic parameters that can be used on any projection in the PROJ library. Below is a list of PROJ parameters which can be applied to most coordinate …

Dec 1, 2025 · See the following sections for more in-depth descriptions of different parts of the PROJ API or consult the API reference for specifics. Before the PROJ API can be used it is necessary to …

Dec 1, 2025 · Coordinate transformations are defined by, what in PROJ terminology is known as, "proj-strings". A proj-string describes any transformation regardless of how simple or complicated it might be.

Sep 15, 2025 · See Installation for information on how to get pre-built packages of PROJ. Documentation in PDF and zipped HTML can be downloaded using the flyout menu on the left side …

We document here the working of this algorithm as implemented in PROJ 8.0.0. The results of some examples might also be quite sensitive to the content of the PROJ database and the PROJ version …

The proj-data package is a collection of all the resource files that are freely available for use with PROJ. The package is maintained on GitHub and the contents of the package are show-cased on the PROJ …