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RGeo component for reading and writing GeoJSON

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README.rdoc

RGeo::GeoJSON

RGeo::GeoJSON is an optional module for RGeo that provides GeoJSON encoding and decoding services.

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. See the README for the “rgeo” gem for more information.

RGeo::GeoJSON is an optional RGeo add-on module that provides GeoJSON encoding and decoding services. GeoJSON is an emerging standard format used by many web services that need to communicate geospatial data. See www.geojson.com for more information.

Example:

require 'rgeo/geo_json'

str1 = '{"type":"Point","coordinates":[1,2]}'
geom = RGeo::GeoJSON.decode(str1, :json_parser => :json)
geom.as_text              # => "POINT(1.0 2.0)"

str2 = '{"type":"Feature","geometry":{"type":"Point","coordinates":[2.5,4.0]},"properties":{"color":"red"}}'
feature = RGeo::GeoJSON.decode(str2, :json_parser => :json)
feature['color']          # => 'red'
feature.geometry.as_text  # => "POINT(2.5 4.0)"

hash = RGeo::GeoJSON.encode(feature)
hash.to_json == str2      # => true

Installation

RGeo::GeoJSON has the following requirements:

  • Ruby 1.8.7 or later. Ruby 1.9.2 or later preferred.

  • RGeo 0.2.8 or later.

  • If you are using Ruby 1.8, you should install the “json” gem to support parsing JSON strings. Ruby 1.9 has JSON support in its standard library and does not require the gem.

Install RGeo::GeoJSON as a gem:

gem install rgeo
gem install rgeo-geojson

See the README for the “rgeo” gem, a required dependency, for further installation information.

To-do list

  • Add support for the “bbox” and “crs” elements.

Development and support

Documentation is available at virtuoso.rubyforge.org/rgeo-geojson/README_rdoc.html

Source code is hosted on Github at github.com/dazuma/rgeo-geojson

Contributions are welcome. Fork the project on Github.

Report bugs on Github issues at github.org/dazuma/rgeo-geojson/issues

Contact the author at dazuma at gmail dot com.

Acknowledgments

RGeo is written by Daniel Azuma (www.daniel-azuma.com).

Development of RGeo is sponsored by GeoPage, Inc. (www.geopage.com).

License

Copyright 2010-2011 Daniel Azuma

All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

  • Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

  • Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

  • Neither the name of the copyright holder, nor the names of any other contributors to this software, may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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