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RGeo is a geospatial data library for Ruby.

Contributors Wanted!

If you use RGeo and are interested in contributing, please check out our open issues to see if there's anything you're able to help with.


RGeo is a key component for writing location-aware applications in the Ruby programming language. At its core is an implementation of the industry standard OGC Simple Features Specification, which provides data representations of geometric objects such as points, lines, and polygons, along with a set of geometric analysis operations. This makes it ideal for modeling geolocation data. It also supports a suite of optional add-on modules that provide various geolocation-related services.

Use the core rgeo gem to:

  • Represent spatial and geolocation data objects such as points, lines, and polygons in your Ruby application.
  • Perform standard spatial analysis operations such as finding intersections, creating buffers, and computing lengths and areas.
  • Correctly handle spherical geometry, and compute geographic projections for map display and data analysis.
  • Read and write location data in the WKT and WKB representations used by spatial databases.


RGeo works with the following Ruby implementations:

  • MRI Ruby 2.6.0 or later.
  • Partial support for JRuby 9.0 or later. The FFI implementation of GEOS is available (ffi-geos gem required) but CAPI is not.
  • See earlier versions for support for older ruby versions.

Some features also require the following:

  • GEOS 3.2 or later is highly recommended. (3.3.3 or later preferred.) Some functions will not be available without it. This C/C++ library may be available via your operating system's package manager (sudo aptitude install libgeos-dev for debian based Linux distributions, yum install geos geos-devel for redhat based Linux distributions), or you can download it from http://trac.osgeo.org/geos
  • On some platforms, you should install the ffi-geos gem (version 1.2.0 or later recommended.) JRuby requires this gem to link properly with Geos, and Windows builds probably do as well.


Install the RGeo gem:

gem install rgeo

or include it in your Gemfile:

gem "rgeo"

If you are using proj.4 extensions, include rgeo-proj4:

gem "rgeo-proj4"

Upgrading to Version 3.0

See doc/Upgrading-to-v3.md for a checklist of changes to make before upgrading to RGeo 3.0.

For a brief overview of the changes, see NEWS.md.

For a comprehensive list of all changes, see History.md.


The RGeo organization provides several gems that extend RGeo:


Proj4 extensions


Read and write GeoJSON


Read ESRI shapefiles


ActiveRecord connection adapter for PostGIS, based on postgresql (pg gem)


ActiveRecord connection adapter for MySQL Spatial Extensions, based on mysql2


ActiveRecord connection adapter for SpatiaLite, based on sqlite3 (*not maintained)

Development and support

RDoc Documentation is available at https://www.rubydoc.info/gems/rgeo

Contributions are welcome. Please read the Contributing guidelines.

Support may be available on the rgeo-users google group or on Stack Overflow.


You can see more in-depth documentation in the doc folder. Factories and methods are documented inline, you should consider checking https://rubydoc.info/gems/rgeo with the version you are currently using. Or generate documentation locally if you're working on RGeo: yardoc server.

Here's the current list of available topics:

You can see an exhaustive and up to date list at https://rubydoc.info/gems/rgeo/index.


Daniel Azuma created RGeo. Tee Parham is a former maintainer. Keith Doggett, Ulysse Buonomo are current maintainers.

Development is supported by:

RGeo calls the GEOS library to handle most Cartesian geometric calculations, and the Proj4 library to handle projections and coordinate transformations. These libraries are maintained by the Open Source Geospatial Foundation; more information is available on OSGeo's web site.

JRuby support is made possible by the ffi-geos (and upcoming ffi-proj4) gems, by J Smith.


Copyright (c) Daniel Azuma, Tee Parham