# pyproj4/pyproj

Python interface to PROJ (cartographic projections and coordinate transformations library)

Repository: https://github.com/pyproj4/pyproj
Canonical: https://ross.abutalabs.com/products/pyproj
Homepage: https://pyproj4.github.io/pyproj
Language: Python
License: MIT
License Family: permissive
Topics: geospatial, python, coordinate-systems, coordinate-transformation, cartographic-projection, geodesic, hacktoberfest
Last push: 2026-09-02T17:31:36+00:00

## Health v2 (maintenance only)
Score: 71/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 100, release rhythm 18, longevity 100
- inputs: {"age_days": 4265, "days_push": 0, "days_rel": 384, "gap_med": 158.0, "n_releases_24m": 3}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1223, forks 237 (observed 2026-09-03T02:15:17.146139+00:00)

## What it is
pyproj is a Python interface to the PROJ library for cartographic projections and coordinate transformations. It lets Python applications convert coordinates between coordinate reference systems and perform geodesic calculations.

## Use cases
- convert lat/lon coordinates to utm in python
- transform coordinates between coordinate reference systems
- reproject shapefile or raster coordinates
- python bindings for proj library
- calculate geodesic distances between points
- look up CRS definitions by EPSG code

## When to choose
- you need accurate coordinate transformations in Python
- you work with GIS data and need CRS handling
- you want a maintained wrapper around the industry-standard PROJ library

## When to avoid
- you need a full GIS toolkit with geometry operations - use geopandas or shapely alongside it
- you are not working with geospatial coordinates

## Facets
- artifact type: library
- maturity: stable
- function: geospatial, sdk
- domain: data-science
- platform: python, cross-platform
- tags: coordinate-transformation, cartographic-projection, proj, crs, geodesic, gis, geospatial, maps

## Member repositories
- pyproj4/pyproj (main) score 71

## Provenance
- Observed fields: from GitHub, fetched 2026-09-03T02:15:17.146139+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:16:01.845443+00:00, confidence not recorded.
  - readme: https://github.com/pyproj4/pyproj (fetched 2026-09-03T02:15:17.146139+00:00, sha 2f636dfe107c)
  - homepage: https://pyproj4.github.io/pyproj (fetched 2026-08-29T12:24:44.052439+00:00, sha e04c17b8b5c7)
- Data as of 2026-08-30T08:39:29.467469+00:00.