Updating digital technical maps for the needs of building design

The aim of the paper is to present selected experiences with the updating of the digital technical map (DTM) data set after less than a year of its operation, to specify its advantages from the surveyor's point of view and its consequences for building design. When updating the basic spatial situation (ZPS) data set, problems were identified concerning photogrammetric surveying, the unprofessional vectorisation of mobile mapping data, and inconsistencies between digital technical maps and digital cadastral maps. Problems were also identified during the update of the transport and technical infrastructure (DTI) data set, these being the incompleteness of available data and the incorrect assignment of descriptive attributes.