The main challenge in the renewal and updating of the Cadastre of Real Estate of the Czech Republic is to achieve maximum efficiency but to retain the required accuracy of all points in the register. The paper discusses the possibility of using UAV photogrammetry and laser scanning for cadastral mapping in the Czech Republic. Point clouds from images and laser scans together with orthoimages were derived over twelve test areas. Control and check points were measured using geodetic methods (RTK-GNSS and total stations). The accuracy of the detailed survey based on UAV technologies was checked on hundreds of points, mainly building corners and fence foundations. The results show that the required accuracy of 0.14 m was achieved on more than 80% and 98% of points in the case of the image point clouds and orthoimages and the case of the LiDAR point cloud, respectively. Nevertheless, the methods lack completeness of the performed survey that must be supplied by geodetic measurements. The paper also provides a comparison of the costs connected to traditional and UAV-based cadastral mapping, and it addresses the necessary changes in the organisational and technological processes in order to utilise the UAV based technologies.

In the period 1939 – 1946, the territory of the Czech Republic was mapped for the purpose of renewing topographic maps of the territory of the Third Reich, and aerial reconnaissance (AR) of the CR territory was also carried out by the Allies. The AR was conducted in two directions. The first was to search for enemy targets, and the second was to verify the results of bombing these targets. Allied data indicated that up to 20% of the bombs did not explode. This unexploded aerial ammunition is to this day a threat to construction in the outskirts of towns and cities. This paper discusses the procedures for processing archival aerial photographs of bombed areas in the Czech Republic and the identification of unexploded ammunition on these images.