Accuracy assessment of DEMs derived from low-cost UAV-based remote sensing for geomorphic landform representation: First results
(2013) Belgian Geographical Day — Location: Louvain-la-Neuve, Belgium (25.May.2013)
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- Abstract
- This study investigates the construction of a digital elevation model (DEM) using aerial photographs taken from a drone in the perspective of geomorphic applications. In this context, a representation of the earth surface at very-high resolution is crucial to accurately quantify small geomorphic landforms with high precision. These very high resolution digital elevation models can then theoretically be used to quantify changes in earth surface topography over time, based on differencing of DEMs taken at various time periods. However, high accuracy topographic representation is compulsory in this case as DEM differencing automatically leads to error propagation. As a low-cost alternative, we equipped an eight-propeller drone with a standard reflex camera. This equipment can easily be deployed in the field, as it is a lightweight, low-cost system in comparison with classic aerial photo surveys and terrestrial or airborne LiDAR scanning. Here, we tested to one method to extract a high-resolution DEM on the basis of the aerial photos: aerial photos are first processed into free software which generates 3D point clouds from arbitrary image configuration. The entire generated point cloud is then georeferenced. The accuracy and precision of the earth surface representation is then assessed by comparing it with very high resolution topographic data from airborne LiDAR and very high-resolution GPS measurements.
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Clapuyt, F., Vanacker, V., Van Oost, K., & et al. (2013). Accuracy assessment of DEMs derived from low-cost UAV-based remote sensing for geomorphic landform representation: First results. Belgian Geographical Day, Louvain-la-Neuve, Belgium. https://hdl.handle.net/2078.5/218405