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GeoHash library for pure Ruby

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README.rdoc

pr_geohash

DESCRIPTION:

GeoHash encode/decode library for pure Ruby.

It's implementation of en.wikipedia.org/wiki/Geohash

FEATURES

  • Encode/decode geohash

  • Calculate adjacent geohash

  • Tested with Ruby 1.8.7 and JRuby 1.3.1

SYNOPSIS:

require "rubyforge"
require "pr_geohash"

#########
# Encode latitude and longitude into geohash

GeoHash.encode(47.6062095, -122.3320708)
# => "c23nb62w20st"

GeoHash.encode(47.6062095, -122.3320708, 6)
# => "c23nb6"

#########
# Decode from geohash

GeoHash.decode("c23nb6")
# => [[47.603759765625, -122.332763671875], [47.6092529296875, -122.32177734375]]

#########
# Calculate adjacent geohash

GeoHash.neighbors("xn774c")
# => ["xn774f", "xn7754", "xn7751", "xn7750", "xn774b", "xn7748", "xn7749", "xn774d"]

=begin
+--------+--------+--------+
| xn774d | xn774f | xn7754 |
+--------+--------+--------+
| xn7749 | xn774c | xn7751 |
+--------+--------+--------+
| xn7748 | xn774b | xn7750 |
+--------+--------+--------+
=end

INSTALL:

  • sudo gem install pr_geohash

LICENSE:

(The MIT License)

Copyright © 2009 Yuichiro MASUI

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Based library is

github.com/davetroy/geohash-js/blob/master/geohash.js

Geohash library for Javascript

Copyright © 2008 David Troy, Roundhouse Technologies LLC

Distributed under the MIT License

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