A collection of index based algorithms for comparison purposes. Also contains RStarTrees for indexing and the DBSCAN algorithm. Yet, this library is not intended as a library and really is complicated to use (see http://elki.dbs.ifi.lmu.de/wiki/HowTo/InvokingELKIFromJava).
Event-Detection - DBSCAN Algorithm in Map/Reduce logic, implemented with Hadoop and MongoDB, to analyze tweets and photos and to create geolocated events
D. Habich, P. Volk, W. Lehner, R. Dittmann, и C. Utzny. ICDMW '07: Proceedings of the Seventh IEEE International Conference on Data Mining Workshops, стр. 471--476. Washington, DC, USA, IEEE Computer Society, (2007)
S. Günnemann, B. Boden, и T. Seidl. Joint European Conference on Machine Learning and Knowledge Discovery in Databases, стр. 565--580. Springer, (2011)