\input zb-basic \input zb-ioport \iteman{io-port 05735893} \itemau{Vetro, Rosanne; Simovici, Dan A.} \itemti{Entropic quadtrees and mining Mars craters.} \itemso{Perner, Petra (ed.), Advances in data mining. Applications and theoretical aspects. 10th industrial conference, ICDM 2010, Berlin, Germany, July 12--14, 2010. Proceedings. Berlin: Springer (ISBN 978-3-642-14399-1/pbk). Lecture Notes in Computer Science 6171. Lecture Notes in Artificial Intelligence, 210-221 (2010).} \itemab Summary: This paper introduces entropic quadtrees, which are structures derived from quadtrees by allowing nodes to split only when nodes point to sufficiently diverse sets of objects. Diversity is evaluated using entropy attached to the histograms of the values of features for sets designated by the nodes. As an application, we used entropic quadtrees to locate craters on the surface of Mars, represented by circles in digital images. \itemrv{~} \itemcc{} \itemut{} \itemli{doi:10.1007/978-3-642-14400-4\_17} \end