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The "SpatialSearch" page has been changed by AlexandreRafalovitch:
http://wiki.apache.org/solr/SpatialSearch?action=diff&rev1=87&rev2=88

Comment:
Now that Solr 4 is out, it makes sense to indicate new Geo type more 
prominently on the page

  
  '''NOTE: Unless otherwise specified, all units of distance are kilometers and 
points are in degrees of latitude,longitude.'''
  
+ = New Solr 4 Spatial Field Types =
+ Lucene 4 has a new spatial module that replaces the older one described 
below. The Solr adapters for it are documented here: 
SolrAdaptersForLuceneSpatial4. The rest of this document is about the 
still-supported older approach.
+ 
  = QuickStart =
  If you haven't already, download Solr, start the example server and index the 
example data as shown in the [[http://lucene.apache.org/solr/tutorial.html|solr 
tutorial]].  With the Solr server running, you should be able to click on the 
example links and see real responses.
  
@@ -25, +28 @@

  <field name="store">40.7143,-74.006</field>     <!-- NYC store -->
  <field name="store">37.7752,-122.4232</field>   <!-- San Francisco store -->
  }}}
+ 
  
  == Schema Configuration ==
  
@@ -204, +208 @@

  === Filtering Caveats ===
  For the {{{bbox}}} filter, when the bounding box includes a pole, the 
!LatLonType will switch from producing a bounding box to a "bounding bowl" 
(i.e. a [[http://mathworld.wolfram.com/SphericalCap.html|spherical cap]]) 
whereby it will include all values that are North or South of the latitude of 
the would be bounding box (the lower left and the upper  right) that is closer 
to the equator.  In other words, we still calculate what the coordinates of the 
upper right corner and the lower  left corner of the box would be just as in 
all other filtering cases,  but we then take the corner that is closest to the 
equator (since it  goes over the pole it may not be the lower left, despite the 
name) and  do a latitude only filter.  Obviously, this means there will be more 
 matches than a pure bounding box match, but the query is much easier to  
construct and will likely be faster, too.
  
- = New Solr 4 Spatial Field Types =
- Lucene 4 has a new spatial module that replaces the older one before it.  The 
Solr adapters for it are documented here: SolrAdaptersForLuceneSpatial4
- 
  = Spatial Options Under Development =
  SpatialSearchDev -- Covers things like Geohash (supports multivalue lat-lon 
points), other distance functions, etc.
  

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