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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 =
