DSM based on ALS data for needs of urban space analysis / Radosław PISKORSKI, Krystian PYKA // W: Geomatics 2018 : archives of geomatics : Baltic Geodetic Congress : Olsztyn, Poland 21-23 June 2018 : book of abstracts / ed. Mateusz Ciski. — Olsztyn : University of Warmia and Mazury in Olsztyn. Faculty of Geodesy, Geospatial and Civil Engineering, 2018. — ISBN: 978-83-947357-7-7. — S. 60–61. — Bibliogr. s. 61