---
id: reproj
version: "0.2.0"
license: BSD-3-Clause
license_treatment: permissive
maintenance: active
---

# reproj — Reproject shapely geometries

License: permissive · Maintenance: active · Downloads: 267.7K/mo

## What it is and what it does

Reproj is a minimal wrapper around pyproj and shapely that reduces the boilerplate needed to reproject individual shapely geometries between coordinate reference systems. Instead of manually creating a pyproj Transformer and calling shapely.ops.transform, you pass a geometry and two CRS identifiers to a single reproj() function. It mirrors the ease of use of GeoPandas's to_crs method but for standalone shapely features rather than GeoDataFrames.

The package is designed for developers working with vector geospatial data who need to transform individual geometries or small collections between coordinate systems. It requires Python 3.9 or later and depends on pyproj for coordinate transformation logic and shapely for geometry handling.

Use it for:

- Convert a single shapely geometry from WGS84 (EPSG:4326) to a projected UTM zone for distance calculations.
- Batch reproject geometries in a loop without writing the pyproj Transformer boilerplate each time.
- Simplify coordinate system conversions in GIS scripts that don't warrant a full GeoPandas workflow.
- Transform geometries between arbitrary EPSG codes in geospatial data processing pipelines.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Reproject shapely geometries between coordinate reference systems with a single function call, wrapping pyproj and shapely to simplify the common GIS transformation task.

Yes, if you work with individual shapely geometries and need frequent coordinate system transformations. The package genuinely simplifies a common task and has no security vulnerabilities. It is actively maintained, has low install friction, and uses a permissive license. The main caveat is its small ecosystem footprint (1 star, early beta status) — it is stable for its narrow purpose but not battle-tested at scale.

## Install

pip install reproj
uv add reproj
poetry add reproj

## Installing reproj

Before you install: Low install friction with a pure-Python wheel and only two runtime dependencies (pyproj and shapely). Actively maintained with a recent release 75 days ago and ongoing repository activity.

License in practice: BSD-3-Clause is permissive; you can use this package freely in commercial and private projects with minimal restrictions beyond retaining the license notice.

Quickstart:

pip install reproj

from reproj import reproj

utm_shape = reproj(wgs84_shape, 4326, 32630)

Verify before relying:

- Whether the package handles edge cases like null geometries, invalid CRS codes, or mixed geometry types gracefully.
- Performance characteristics when reprojecting large geometry collections or complex shapes.
- Whether additional CRS formats beyond EPSG codes (e.g., WKT, proj strings) are supported.

## Package facts

- License: BSD-3-Clause (permissive)
- Python support: supports_current
- Install friction: low
- Maintenance: active
- Downloads: 267.7K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

reproject shapely geometries, coordinate reference system transform, gis coordinate conversion, shapely crs reprojection, pyproj wrapper geometry, geospatial coordinate transform, gis, geospatial, coordinate-transform

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