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Gps座標を短い文字列で扱えるGeo Hashが面白い

by Kentaro Matsui on Feb 15, 2010

http://ke-tai.org	126
http://www.slideshare.net	2

GPS GeoHash ke-tai.org
• • ke-tai.org •
GeoHash • • +141.22.35.364, +43.3.14.112 ↓ ↓ ↓ xpssbxt2gpf
GeoHash (2) • • xpssbxt2 8 xpssbx 6
GeoHash (3) • xpst08
(1) • • SQL like lon > 141.22345 AND lon < 141.23124 AND lat > 43.41228AND lat < 143.42.097 ↓ ↓ ↓ geohash LIKE ‘xpssbxt2%’
(2) • URL foo.php?lon= 141.22345&lat= 43.41228&zoom=12 ↓ ↓ ↓ bar.php?gh=xpssbxt2 • Perl, PHP, Ruby, Java, JavaScript → LOCAL riaf PHP http://blog.riaf.jp/post/378886859/geohash-php
• → 1. base32 2. 2 (5bit) 3. bit( ) bit( ) 4. • URL http://d.hatena.ne.jp/yuroyoro/20100115/1263526125
GeoHash • • Web