“…As façades and poles are usually oriented in vertical direction, further features can be derived by projecting all 3D points onto a ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume II-5/W2, 2013 ISPRS Workshop Laser Scanning 2013, 11 -13 November 2013, Antalya, Turkey horizontally oriented plane P. In particular, the local point density D2D in the new 2D representation can be derived based on the radius r k-NN,2D of the circular neighborhood defined by a 2D point and its k neighbors (Lari and Habib, 2012). Additionally, the eigenvalues λ1,2D and λ2,2D of the structure tensor S2D in 2D as well as their ratio…”