Which applications use R-Trees?

Question

Besides GIS applications, which other applications or libraries use R-trees and its variants?

Answer 1

Computer games often do. Here's a link to something cool.

Computer graphics - both software and hardware - often use spatial partitioning e.g. BSP; there's neat logic in Imagination and Intel chips termed tile or zone rendering, for example.

Code I've seen tends to lean towards fixed resolution dividing - octtrees, typically - rather than variable size buckets, but I'd still consider them 'variants' of R-trees.

Answer 2

"R-trees have grown everywhere; from CAD and geographical databases to multimedia and time series management systems." http://www.rtreeportal.org/

about 2,620,00 results, 10.9 seconds to Google and post on SO

Answer 3

Some relational databases use R-trees for indexing.

PostgreSQL is one example. http://www.postgresql.org/docs/8.1/static/indexes-types.html

Answer 4

Here's an application -- a personal carbon calculator that resides within your smartphone -- using R-trees that are part of the Perst Lite open source embedded database.

http://tinyurl.com/2377fpl