RGeo

RGeo is a geospatial data library for Ruby.

Summary

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.

Several optional modules are currently available:

• Generate and interpret GeoJSON data for communication with common location-based web services using the rgeo-geojson gem.
• Read GIS datasets from ESRI shapefiles using the rgeo-shapefile gem.
• Extend ActiveRecord to handle spatial data in MySQL Spatial, SpatiaLite, and PostGIS using RGeo's spatial ActiveRecord adapters. These are available via the gems:
  • activerecord-postgis-adapter
  • activerecord-mysql2spatial-adapter
  • activerecord-spatialite-adapter

Need help? Join the rgeo-users google group at: http://groups.google.com/group/rgeo-users

Dependencies

RGeo is known to work with the following Ruby implementations:

• Ruby 2.0.0 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 pre-2.0 ruby.

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
• Proj 4.7 or later is also recommended. This library is needed if you want to translate coordinates between geographic projections. It also may be available via your operating system's package manager (sudo aptitude install libproj-dev for debian based Linux distributions, yum install proj proj-devel for redhat based Linux distributions), or from http://trac.osgeo.org/proj
• On some platforms, you should install the ffi-geos gem (version 0.0.6 or later recommended.) JRuby requires this gem to link properly with Geos, and Windows builds probably do as well.

Installation

Install the RGeo gem:

gem install rgeo

Note: By default, the gem installation looks for the Proj4 library in the following locations by default: /usr/local, /usr/local/proj, /usr/local/proj4, /opt/local, /opt/proj, /opt/proj4, /opt, /usr, and /Library/Frameworks/PROJ.framework/unix.

If Proj4 is installed in a different location, you must provide its installation prefix directory using the "--with-proj-dir" option.

Development and support

RDoc Documentation is available at http://rdoc.info/gems/rgeo

Source code is hosted on Github at https://github.com/rgeo/rgeo

Contributions are welcome. Fork the project on Github.

Report bugs on Github issues at https://github.com/rgeo/rgeo/issues

Support available on the rgeo-users google group at http://groups.google.com/group/rgeo-users

Acknowledgments

RGeo was created by Daniel Azuma. Tee Parham is the current maintainer.

Thanks to Pirq and Neighborland for development support.

Continuous integration service provided by Travis-CI (http://travis-ci.org).

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 (http://www.osgeo.org).

JRuby support is made possible by the ffi-geos (and upcoming ffi-proj4) gems, by J Smith (https://github.com/dark-panda).

License

Copyright (c) Daniel Azuma, Tee Parham

https://github.com/rgeo/rgeo/blob/master/LICENSE.txt