使用 Apache Lucene 和 Solr 进行位置感知搜索

http://tech.idv2.com/2011/07/05/geohash-intro/

http://tech.idv2.com/2011/06/17/location-search/

http://code.google.com/p/simplelatlng/

http://code.google.com/p/geohashdroid/

http://code.google.com/p/python-geohash/

http://code.google.com/p/python-geohash64/

http://code.google.com/p/geoandhash

http://code.google.com/appengine/articles/geosearch.html

https://github.com/phughes/geobox

在GAE之中使用基于地理位置的查询

http://www.cnblogs.com/step1/archive/2009/04/04/1426714.html