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The "SpatialSearch" page has been changed by GrantIngersoll.
http://wiki.apache.org/solr/SpatialSearch?action=diff&rev1=17&rev2=18

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  In practice, for those using Solr's field types above, the Spatial Filter 
!QParser will automatically make the correct decision about how best to filter. 
 If an application needs a specific type of filtering for performance or other 
needs, the best bet is to extend the !FieldType in question with your own needs.
  
+ 
+ 
  == Spatial Filter QParser ==
  See https://issues.apache.org/jira/browse/SOLR-1568.
+ 
+ ''NOTE: Depending on the !FieldType, different calculations for distance will 
be applied''  For instance, the !PointType uses a rectangular coordinate system 
and uses the Euclidean distance.
+ 
+ See !SpatialFilterTest for examples of the various points.
+ 
  
  The following parameters are supported:
  

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