On 09/14/2010 07:48 PM, Dennis Gearon wrote: > You are probably not talking about clusters in the physical structure of data > on this disk, right? > > What do YOU mean by clusters if not?
I mean basically "range facets", where the ranges are 2-dimensional distances between documents that have indexed latitudes and longitudes. An example of what I mean: http://googlegeodevelopers.blogspot.com/2009/04/markerclusterer-solution-to-too-many.html http://gmaps-utility-library.googlecode.com/svn/trunk/markerclusterer/1.0/examples/simple_example.html If you zoom in (or, in an analogy with searching, specify a bounding box within which to look for documents), the grouped points become individual points. This is basically the same idea as "Show me the widgets between $0 and $100", and then narrowing further from $50 to $60. But instead of just a single float or int, it's a distance calculation to a 2D point. The mapping stuff is all out-of-scope for Solr, but indexing of documents in such a way that I could get counts of documents in various geographic ranges seems useful to anyone interested in providing a browsing/searching interface to a large corpus of geographic data. Does that explain it? The previous thread which discusses this is here: http://search.lucidimagination.com/search/document/16d0dbc4ac0a7540/geographic_clustering#6c1bba9a39df5f1b best, Charlie
