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The paper analyses the method of processing LIDAR points. The method of point classification is made with reference to selecting points in the neighbourhood and to fitting a local plane. The values of eigenvectors are calculated and the iteration method of Jacobi is used for fitting the local plane. The approximately created slope top and bottom lines are revised fitting the local plane on the left and right side of each segment. Computer programs are made with reference to the algorithm. The proposed method is employed in the tested territory. The correct values of the parameters of the algorithm are chosen comparing the obtained results with cartography data traditional in this territory. The results of the carried out experiment confirm that the algorithm allow to achieve the excellent quality of the maps at a scale 1:1000. [ABSTRACT FROM AUTHOR]