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((refimprove|date=June 2012))
The '''Geohash-36''' [[Geocoding|geocode]] is an [[opensource]] compression algorithm for world coordinate data. It was developed as a variation of the [[Irish Geocodes|OpenPostcode]] format developed as a candidate [[geolocation]] [[Postal codes in the Republic of Ireland|postcode for the Republic of Ireland]].<ref>((cite web|title=DCENR Postcodes|url=http://www.dcenr.gov.ie/Communications/Postal/Postcodes.htm|access-date=26 June 2012))</ref>   It is calculated differently and uses a more concise [[base 36]] representation rather than other [[geocode]]s that adopted [[base 32]].<ref>((cite web|title=Geohash Tips & Tricks|url=http://geohash.org/site/tips.html|access-date=26 June 2012))</ref>

Despite the name, there are '''no''' [[algorithm|algorithmic]] (not use [[Z-order curve]]) or [[geocode#Classification|typological]] relationship with [[Geohash]]. It is a publicity strategy to relate to a popular geocode of base 32. The encode/decode functions are not mathematically-similar to Geohash functions.

== Coding Method ==
Designed for [[URL]]s and electronic storage and communication rather than human memory and conversation, it is case-sensitive, using a 36 character alphabet: "23456789bBCdDFgGhHjJKlLMnNPqQrRtTVWX".

Character Conversion:

{| class="wikitable" style="float: left;"
|- align="right"
! Decimal
| 0 || 1 || 2 || 3 || 4 || 5 || 6 || 7 || 8 || 9 || 10 || 11 || 12 || 13 || 14 || 15 || 16 || 17
|- align="right"
! Geohash-36 
| 2 || 3 || 4 || 5 || 6 || 7 || 8 || 9 || b || B || C || d || D || F || g || G || h || H
|- 
| style="font: 0.5em/0.5em serif;" colspan="19" | &nbsp;
|- align="right"
! Decimal
| 18 || 19 || 20 || 21 || 22 || 23 || 24 || 25 || 26 || 27 || 28 || 29 || 30 || 31 || 32 || 33 || 34 || 35  
|- align="right"
! Geohash-36 
| j || J || K || l || L || M || n || N || P || q || Q || r || R || t || T || V || W || X
|}
((clear|left))

Characters are chosen to avoid [[vowel]]s, vowel-like numbers, character confusion, and to use lowercase characters which are generally distinct from their uppercase equivalents in standard typefaces.

The code can be of varying length and thus precision. Each character represents a further subdivision in a 6 by 6 grid - starting at the North-West (top-left) coordinate and continuing, row by row, to the South-East (bottom-right). Neighbouring coordinates have largely similar encodings and generally vary at the rightmost characters only; however extreme [[edge cases]] exist where neighbouring coordinates are on opposing sides of a grid division. Codes sort logically but not in ordinary coordinate order.

Without vowels, unintended English-language words are avoided that may appear in the original Geohash code. As vowels are not used, an altitude component of encoded meters is optional with a prefixing "A" character (below sea-level prefixed by a lowercase "a").

An optional [[checksum]] is represented using the lowercase English alphabet. It confirms the code as a Geohash-36 and provides a check for incorrect or transposed characters. It is calculated as [[modulo operator|modulus]] 26 of the sum of each character value (the altitude delimiters of "A" or "a" are valued at zero) multiplied by its position reading from left to right.

== Efficiency ==
Compared to storing GPS coordinates using the [[Decimal data type|Decimal]] datatype in [[SQL]] the Geohash-36 does not save significantly on database bytes. Using DECIMAL(8,5) and DECIMAL(7,5) requires 10-bytes<ref>((cite web|title=MSDN "decimal and numeric (Transact-SQL)"|url=http://msdn.microsoft.com/en-us/library/ms187746.aspx|access-date=26 June 2012))</ref> and is accurate to about 1.1 metre squared (or better further from the equator). An equivalent 10-bytes of the Geohash-36 code is accurate to approximately a 6th of square meter.<ref>((cite web |title=Geohash-36 |url=http://www.openpostcode.org/other-codes/geohash-36 |access-date=26 June 2012 |url-status=dead |archive-url=https://web.archive.org/web/20121227195936/http://www.openpostcode.org/other-codes/geohash-36 |archive-date=27 December 2012 ))</ref>

The [[Statue of Liberty]], at coordinates 40.689167, −74.044444, is encoded as 9LVB4BH89g-m. The reverse decoding equates to 40.68916''8'', −74.044445.

The [[Shard London Bridge|Shard]] building, London, at coordinates 51.504444, −0.086667 is encoded as bdrdC26BqH-m (decodes to 51.504444, −0.08666''6''), or may be successfully shorted to bdrdC26B.<ref>((cite web|title=Geo36.org|url=http://geo36.org/bdrdC26BqH-m|access-date=26 June 2012))</ref>

== Implementations ==

=== C ===
* [https://github.com/rafamdr/libgeohash36 'libgeohash36'] – a pure C implementation of Geohash-36 algorithm.

=== Ruby ===
* [https://github.com/clothesnetwork/geohash36 'Geohash36'] – a Ruby implementation of the Geohash-36 algorithm.

== See also ==
* [[List of geodesic-geocoding systems]]
== References ==
((Reflist))

((-))
((geocoding-systems))

[[Category:Compression algorithms]]
[[Category:Geocodes]]

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