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From Apache Wiki <wikidi...@apache.org>
Subject [Solr Wiki] Update of "SpatialSearch" by GrantIngersoll
Date Mon, 28 Dec 2009 18:14:38 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Solr Wiki" for change notification.

The "SpatialSearch" page has been changed by GrantIngersoll.
http://wiki.apache.org/solr/SpatialSearch?action=diff&rev1=8&rev2=9

--------------------------------------------------

  
  See http://www.geohash.org and http://en.wikipedia.org/wiki/Geohash
  
- === Tiers ===
+ === Tiles ===
- (The following information is best described on the [[http://www.nsshutdown.com/projects/lucene/whitepaper/locallucene_v2.html|Local
Lucene White Paper]]. Thanks to Patrick O'Leary for providing this information.)
+ (Sometimes called Grids or Tiers or a variety of other things.  See http://www.lucidimagination.com/search/document/e0dc70aa8ade729d/spatial_cartesian_tiers_nomenclature#bcf8a28f8d651022
for discussion)
  
- A Cartesian tier is the result of first flattening the world (using a Sinusodial projection)
and then dividing up the world into 2^n grid boxes. Each tier (called "n") covers a particular
area of the flattened earth, and as n grows bigger, so does the tier resolution. That is,
tier 2 is at a much coarser resolution than say tier 10 that covers the same area.
+ A tile is the result of first flattening the world (using a projection) and then dividing
up the world into 2^n grid boxes. Each tile (called "n") covers a particular area of the flattened
earth, and as n grows bigger, so does the tile resolution. That is, 2nd level tile is at a
much coarser resolution than say a tile at level 10 that covers the same area.
  
- See https://issues.apache.org/jira/browse/SOLR-1586 for the CartesianTierFieldType, which
can index points into tiers.
+ See https://issues.apache.org/jira/browse/SOLR-1586 for the !SpatialTileField, which can
index points into tiles at multiple levels.
  
  = Indexing =
  = Filtering =

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