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Sitecore.ContentSearch.Spatial (Lucene Only)
Integrating Spatial search with Sitecore Search API (Sitecore.ContentSearch)
This module will allow you to run Spatial queries against items in sitecore which have latitude and longitude fields
.IsWithinRadius() : This method returns locations within specific circle, results will be sorted based on the distance of the center of circle
Installation and usage description are in this post : http://bit.ly/SitecoreSpatial
Apply geo location filter Using Sitecore ContentSearch API