Photo-Based 3d Scanning vs. Laser Scanning – Competitive Data Acquisition Methods for Digital Terrain Modelling of Steep Mountain Slopes

Abstract

ABSTRACT:The paper presents how terrestrial laser scanning (TLS) and terrestrial digital photogrammetry were used to create a 3D model of a steep mountain wall. Terrestrial methods of data acquisition are the most suitable for such relief, as the most effective registration is perpendicular to the surface. First, various aspects of photo-based scanning and laser scanning were discussed. The general overview of both technologies was followed by the description of a case study of the western wall of the Kościelec Mountain (2155 m). The case study area is one of the most interesting and popular rock climbing areas in the Polish High Tatra Mts. The wall is about 300 meters high, has varied relief and some parts are overhung. Triangular irregular mesh was chosen to represent the true-3D surface with its complicated relief. To achieve a more smooth result for visualization NURBS curves and surfaces were utilized. Both 3D models were then compared to the standard DTM of the Tatra Mountains in TIN format, obtained from aerial photographs (0.2 m ground pixel size). The results showed that both TLS and terrestrial photogrammetry had similar accuracy and level of detail and could effectively supplement very high resolution DTMs of the mountain areas.

A low-cost landslide displacement activity assessment from time-lapse photogrammetry and rainfall data: Application to the Tessina landslide site

“…Even though the accuracy of photogrammetric methods can be increased by using high-resolution camera sensors and decreasing the distance from the surface to be monitored, the results will never be comparable to the accuracy of other methods, such as laser scanner surveys (Kolecka, 2011). However, millimetric or centimetric displacement measurements are typically unnecessary for many landslides, and long-term or high frequency monitoring could be more important, especially for large and intermittent movements.…”

“…The use of images from different points of view in terrestrial digital photogrammetry was shown to be a promising technique to obtain 3D reconstructions of slope surfaces (Kolecka, 2011;Westoby et al, 2012). In the future, this tool will likely be a valuable way to obtain accurate metric 3D displacement fields, as has already been demonstrated for laboratory applications (Szeliski and Kang, 1994;Pons et al, 2007) and aerial photos (Kaab, 2000).…”

Double Size Fulljet Field Rainfall Simulator for Complex Interrill and Rill Erosion Studies

“…Obtained stereo pair images are processed in PhotoModeler Scanner software, which derives accurate, high quality 3D models and enables measurements based on photographs. The process is known as photo-based 3D scanning [29] or image-based modelling [30] and is used for producing a dense point cloud (Dense Surface Modelling) from images of textured surfaces. The multi-sheet camera calibration is executed before the automatic Dense Surface Modelling.…”

Rockfall detection along road networks using close range photogrammetry

“…Furthermore, integration of geophysical sensors such as geophones, seismographs and accelerometers for efficient rockfall monitoring has been proposed in [5,6]. Besides these techniques, image based methods that rely upon the construction of accurate digital elevation models from stereo photographs have been proposed, evaluated and implemented in several studies [7][8][9][10].…”