2014-11-16 21:31:11 +00:00
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these-3-words
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=============
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2014-11-17 00:03:10 +00:00
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Address any 3x3meter square on earth with a unique three word name.
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2014-11-16 21:31:50 +00:00
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Inspired by http://what3words.com/
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2014-11-17 00:03:10 +00:00
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example
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=======
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>>> import thesethreewords as these
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# the home of particle physics
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>>> CERN = (46.232355, 6.055419)
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>>> three = these.three_words(CERN)
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>>> print three
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'engirt-aleutic-canun'
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>>> these.decode(three)
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(46.232335567474365, 6.055419445037842)
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Check out where this is on [google maps][cernmap].
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requirements
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============
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You need to install the [geohash][geohash] library:
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$ pip install geohash
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six words
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=========
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There are a lot of 3x3m squares on the earth's surface. To encode
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them in only three words requires a long wordlist, as a result
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some fairly obscure words get on it. If you can live with
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having to remember six words the wordlist is much shorter.
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The six word wordlist comes from the amazing [humanhash][humanhash]
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library. Words were chosen to maximise clarity in human
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communication.
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>>> six = these.six_words(CERN)
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>>> print six
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'spaghetti-carolina-kentucky-oscar-iowa-table'
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>>> these.decode(six)
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(46.232335567474365, 6.055419445037842)
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how it works
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============
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Each latitude/longitude pair is converted to a nine
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character geohash. This provides about 3meter
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resolution at all latitudes. The geohash is then
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converted to an integer which is encoded as a string
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of words.
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The wordlist used to encode the `geohash` into just
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three words uses your local computers dictionary. Some
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attempts are made to remove really obscure words but
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it could be better. You need to use the same wordlist
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when encoding and decoding a `these-3-words` hash.
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The `these-3-words` hash shares the
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property of a `geohash` that nearby locations share
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have similar `these-3-words` hashes
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>>> other_CERN_site = (46.256811, 6.056792)
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>>> six = these.six_words(other_CERN_site)
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>>> print six
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''spaghetti-carolina-kentucky-utah-seventeen-neptune'
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>>> these.decode(six)
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(46.256797313690186, 6.056792736053467)
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The other CERN site is [here][othercernmap].
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this is a [@betatim][betatim] kind of idea
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[humanhash]: https://github.com/zacharyvoase/humanhash
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[geohash]: https://code.google.com/p/python-geohash/
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[cernmap]: https://www.google.ch/maps/place/46%C2%B013'56.4%22N+6%C2%B003'19.5%22E/@46.2323356,6.0554194,17z/data=!3m1!4b1!4m2!3m1!1s0x0:0x0
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[othercernmap]: https://www.google.ch/maps/place/46%C2%B015'24.5%22N+6%C2%B003'24.4%22E/@46.256811,6.056792,14z/data=!4m2!3m1!1s0x0:0x0
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[betatim]: https://twitter.com/betatim
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