One of the first visible signs of landslide occurrence is changes in microrelief of the slope. In the classical landslide monitoring procedure to determine the land deformation, direct surveys are used. To get accurate and actual information about the object, the ultrahigh resolution unmanned aerial systems imagery can be applied. A digital surface model can be developed and utilized to create a high-resolution orthophotograph as well as a point cloud, which can be used to develop a digital terrain model. Pictures taken by unmanned aerial vehicles have a ground resolution of a pixel on the level of single centimetres. This type of cartometric material is developed in short time and allows to specify the landslides range and features, and in evaluating the mass movement. Cyclical measurements also allow to determine the resulting deformation although it should be noted that the accuracy of survey depends on the vegetation process. In this study, the methodology of landslide monitoring using unmanned aerial systems as well as comparative analyses to the other techniques such as terrestrial laser scanning or airborne laser scanning, were presented.
Keywords: terrestrial laser scanning (TLS), airborne laser scanning (ALS), unmanned aerial vehicle (UAV), unmanned aerial systems (UAS), erosion processes, landslide