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From "" <>
Subject Re: Lucene spatial for grid clusters
Date Thu, 06 Nov 2014 13:11:23 GMT
FYI I plan to implement this in Lucene-spatial & Solr in January.

~ David Smiley
Freelance Apache Lucene/Solr Search Consultant/Developer

On Wed, Nov 5, 2014 at 10:52 PM, Shahak Nagiel <>

> I need a way to perform a spatial aggregation query against a potentially
> large document store in order to display summary clusters on a map.  The
> query would slice the current map extents (e.g. -180,-90,180,90) into a
> number of X and Y bins (e.g. 20 x 16) and, for each, seek a summary count,
> so that a heat map or series of clusters could be rendered for the grids.
> Given Lucene's native usage of prefix trees/geohashes, this seems to be a
> good fit.  As a user pans and zooms the map, new map extents would apply,
> so this would need to support dynamic grids.  However, snapping
> results/bins to existing geohashes (of the appropriate depth/level) would
> be fine, assuming that lines up with how the indexes are structured.
> Naively, I could just issue a series of spatial queries, one for each
> grid, and get the count.  But I wonder if there's a better way...
> Has anyone encountered this use case?  Any suggestions on the best/most
> efficient way to achieve?
> Thanks!

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