[Solr Wiki] Update of "SpatialSearch" by Bill Bell

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The "SpatialSearch" page has been changed by Bill Bell.
http://wiki.apache.org/solr/SpatialSearch?action=diff&rev1=43&rev2=44

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  The geodist function can have the points specified as function arguments, or can default to looking at the '''pt''' and '''sfield''' global request parameters.
  
+ Or you could combine geodist() with geofilt (or bbox) to limit the results and sort them by distance:
+ 
+  . [[http://localhost:8983/solr/select?wt=json&indent=true&fl=name,store&q=*:*&fq={!geofilt}&sfield=store&pt=45.15,-93.85&sort=geodist()%20asc|...&q=*:*&fq={!geofilt}&sfield=store&pt=45.15,-93.85&sort=geodist() asc]]
+ 
  == Returning the distance ==
  Returning distances (and any arbitrary function query value) is currently under development. As a temporary workaround, it's possible to obtain distances by using geodist or geofilt as the only scoring part of the main query.