SGEM SGEM 2019. 19th International Multidisciplinary Scientific GeoConference. Volume 19. Informatics, Geoinformatics and Remote Sensing : conference proceedings. Albena, Bulgaria, 30 June - 6 July 2019 Issue 2.2 Geodesy and Mine Surveying, Photogrammetry and Remote Sensing, Cartography and GIS. -- 1. vyd. -- Sofia : STEF 92 Technology, 2019. -- 1086 s. -- ISBN : 978-619-7408-80-5. -- ISSN : 1314-2704. -- 10.5593/sgem2019/2.2.