R*-tree

Abstract: 

● C++ and Java implementations by Marios Hadjieleftheriou @UCR: link to source code and visual interface supports main memory and disk based storage managers, advanced query capabilities, arbitrary shaped range queries etc.
● C implementation by Bernhard Seeger group @Marburg: RStarTree.tar.gz (50k) original link
● C++ implementation by Hans-Peter Kriegel's group @Munich: Rstar_Berchtold.tar.gz (30k)
● Java implementation by Dimitris Papadias group @HKUST: Rstar-java.zip (59k)
with a nice interface involving several types of spatial queries
● C implementation in SQLite by unknown author (implemented and packaged as an SQLite virtual table module) link to source code
● C++ in-memory efficient and lightweight implementation by Sattam Alsubaiee and Chen Li (main contributors) more information

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