RGeo is a geospatial data library for Ruby.
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 such as SimpleGeo, 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:
and more to come…
Need help? Join the rgeo-users google group at: groups.google.com/group/rgeo-users
RGeo is known to work with the following Ruby implementations:
Standard “MRI” Ruby 1.8.7 or later. (1.9.2 or later preferred.)
Rubinius 1.1 or later.
Partial support for JRuby 1.6.3 or later. The FFI implementation of GEOS is available (ffi-geos gem is required) but CAPI is not. Proj4 support is expected in the future.
Some features also require the following:
GEOS 3.2 or later is highly recommended. Some functions will not be available without it. This C/C++ library may be available via your operating system's package manager, or you can download it from 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, or from trac.osgeo.org/proj
Note: The build system assumes a unix-like environment. Windows builds may be possible, but not likely “out of the box”.
Install RGeo as a gem:
gem install rgeo
Note: By default, the gem installation looks for the GEOS library in the following locations: /usr/local, /usr/local/geos, /opt/local, /opt/geos, /opt, /usr, and /Library/Frameworks/GEOS.framework/unix. In other words, MacPorts, Homebrew, the Kyngchaos port, and building from source to /usr/local are supported out of the box.
If GEOS has been installed in a different location, you must provide its installation prefix directory using the “–with-geos-dir” option. This option must be preceded by “--” to separate it, as a build switch, from the switches interpreted by the gem command. For example:
gem install rgeo -- --with-geos-dir=/path/to/my/geos/installation
Similarly, 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.
The RGeo suite of tools is evolving rapidly. The current to-do list for the core library includes:
YAML and Marshal serialization support across all major entities.
Better JRuby support.
Ellipsoidal geography implementation, possibly utilizing geographiclib.
Windows build support.
Each of the current add-on modules also has its own feature roadmap, and we are planning on introducing more add-on modules, including:
GeoRSS and KML format support.
Integration with third-party APIs.
Possible additional ActiveRecord adapters.
Development and support
Documentation is available at virtuoso.rubyforge.org/rgeo/README_rdoc.html
Source code is hosted on Github at github.com/dazuma/rgeo
Contributions are welcome. Fork the project on Github.
Report bugs on Github issues at github.org/dazuma/rgeo/issues
Support available on the rgeo-users google group at groups.google.com/group/rgeo-users
Contact the author at dazuma at gmail dot com.
RGeo is written by Daniel Azuma (www.daniel-azuma.com).
Development of RGeo is sponsored by GeoPage, Inc. (www.geopage.com).
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 (www.osgeo.org).
JRuby support is made possible by the ffi-geos (and upcoming ffi-proj4) gems, by J Smith (github.com/dark-panda).
Copyright 2010-2011 Daniel Azuma
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