SUITABILITY OF DIGITAL ELEVATION MODELS GENERATED BY UAV PHOTOGRAMMETRY FOR SLOPE STABILITY ASSESSMENT (CASE STUDY OF LANDSLIDE IN SVÄTÝ ANTON, SLOVAKIA)

摘要

Assessing the accuracy of photogrammetrically-derived digital elevation models (DEMs) from UAV is essential in many geoscience disciplines. The suitability of different DEM devised for slope stability assessment was evaluated in the example of the landslide in Svätý Anton village in Slovakia. Aerial data was acquired during a one-day field campaign in autumn 2014. The point cloud from 218 images (54,607,748 points) was manually classified into 7 different classes for filtering vegetation cover and buildings. Assessment of vertical differences between the UAV derived elevation model and real terrain surface was based on comparison of control points targeted by GPS (337 points) and unclassified and ground classified point cloud for raster elevation models with 1, 5, 10, 20 and 50 cm pixel resolution.