OSGeo/PROJ
Some data may be outdated — see provenance labels.
PROJ - Cartographic Projections and Coordinate Transformations Library observed · 2026-09-24
Health v2 · maintenance only
92/100
- Activity 96
- Release rhythm 83
- Longevity 100
Flags: no_license
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-10-21. Adoption (stars, forks) is never an input.
- gap_med: 84.5
- age_days: 4169
- days_rel: 35
- days_push: 29
- n_releases_24m: 9
Adoption not part of the score
2025 stars · 912 forks observed · 2026-09-24
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
PROJ is a C++ library for generic coordinate transformation, converting coordinates between coordinate reference systems (CRS), including cartographic projections and geodetic transformations. It also ships command-line utilities such as proj, cs2cs, geod, cct, and projinfo for projection and transformation tasks.
Use cases
- transform coordinates between coordinate reference systems
- project geodetic coordinates to a map projection
- convert lat/lon to UTM
- perform geodesic great circle distance calculations
- look up CRS definitions and coordinate operations
- reproject GIS data to a different datum
When to choose
- you need accurate, standards-based CRS transformations in C/C++ or via bindings
- you want battle-tested geodetic datum shift and grid-based transformations
- you need CLI tools for quick one-off coordinate conversions
When to avoid
- you only need simple distance math without CRS handling
- you need a high-level GIS data format reader/writer (use GDAL/OGR instead)
- you cannot manage the proj-data grid resource files required for some datum shifts
Facets
library · maturity stable
geospatial cli developer-tools cross-platform windows cpp cli coordinate-reference-systems cartographic-projections geodetic-transformations gis crs geospatial maps linux macos
1 source
- readme: https://github.com/OSGeo/PROJ · fetched 2026-09-24 · 0c5fb6f8078d
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| OSGeo/PROJ | main | 92 |
For agents
Data as of 2026-10-19T08:05:51.212177+00:00 · Report a problem