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Re:Spatial Data Structures for Better Map Interactions by saosebastiao on Thursday March 27, 2014 @12:35PM (#7481489)
PostGIS uses an R Tree implemented on a GiST index by default, with a pure R tree partially implemented.

http://postgis.net/docs/manual-2.1/using_postgis_dbmanagemen...

Re:Spatial Data Structures for Better Map Interactions by ryandrake on Thursday March 27, 2014 @12:46PM (#7481586)
Ahh, I stand corrected. Thanks!