Summary:

Following the torrential rain and floods that occurred between 1997 and 2010, there has been an emergence of new and previously activated processes related to soil and rock landslides in the Polish Carpathians. In light of the damage incurred by landslides, there is a problem with the thorough diagnosis of the nature of phenomena and thus the development of methods to prevent landslides in the future. This article discusses the problem of surveying landslide areas. It highlights the possibility of using photogrammetric methods for digital imaging, as well as determines the dimensions when estimating the mass of buildings within the area of a landslide, with particular emphasis on the use of an unmanned aerial system (UAS). The described method for obtaining processing images involves a non-metric camera mounted on a UAS. The designed projections centre on individual images and elements of angular orientation and the camera interior. This enables the creation and texturing of a triangulated irregular network (TIN) model. The final result in this work is a digital surface model (DSM) and an orthophotomap. It was found that characteristic land types have been occurring in the landslide substrate with key parameters determining their properties. This enabled the determination of a resistance ground border and provided an opportunity to examine whether a building of known mass may be the main cause of a landslide.