Proximity search methods using tiles to represent geographical zones
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United States of America Patent
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Oct 20, 2009
Grant Date -
Mar 16, 2006
app pub date -
Sep 14, 2004
filing date -
Sep 14, 2004
priority date (Note) -
Reissued
status (Latency Note)
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Abstract
A proximity search engine for carrying out a proximity search with respect to a reference location uses as a reference frame the earth divided into tiles, which are predefined geographic regions of substantially equal areas. Records that are searched based on proximity to a reference location include location pointers, each of which identifies a particular tile that encompasses the physical location indicated by the corresponding record. When the proximity search is carried out, the tiles that are within a specified distance from the reference location are obtained and records having location pointers corresponding to such tiles are selected for inclusion in the search results.
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