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A. Roncat, S. Ghuffar, B. Székely, P. Dorninger, S. Rasztovits, M. Mittelberger, Z. Koma, D. Krawczyk, N. Pfeifer:
"A Natural Laboratory - Terrestrial Laser Scanning and auxiliary Measurements for studying an active Landslide";
Talk: 2nd Joint International Symposium on Deformation Monitoring (JISDM), Nottingham, UK (invited); 2013-09-09 - 2013-09-10; in: "Proceedings", (2013), 9 pages.

The mentioned natural laboratory is an active landslide in Doren (Vorarlberg, Western Austria). This landslide, located in the foreland Molasse zone, was already sketched in historical maps from the 19th century. In recent years, there have been two major events in 2006 and 2007, resp., and ongoing movement since then. These events triggered the demand for regular geodetic monitoring of the landslide. The monitoring activities comprise multi-temporal data sets from both terrestrial (TLS) and airborne laser scanning (ALS), regular geodetic measurements with a tacheometer and a UAV campaign based on a high-resolution medium-frame camera (80 megapixel). The tacheometric monitoring was carried out subdiurnally with an automatic total station on a fixed platform for several years until 2010 and has been continued in epochs of two to three months since then. TLS data sets have been recorded every year from 2008 to 2013, the last two with a full-waveform instrument (RIEGL VZ-400). The UAV campaign was performed synchronously with the last TLS campaign. ALS data sets were recorded in 2003, 2006, 2007 (two times) and 2011.
One focus of this paper is the comparison of movement rates calculated from tacheometry and TLS in homologous areas. Those from TLS were calculated with a range flow approach. The high resolution digital terrain models derived from laser scanning data are used as input for a range flow algorithm, which estimates dense 3D motion vectors over the entire landslide area. The estimated motion vectors represent deformations and surface changes at different parts of the landslide that occurred between two data acquisition campaigns. Furthermore, we compare the resolution and accuracy of TLS vs. the point clouds from image matching of the UAV images. This comparison is accompanied by a discussion on acquisition methods beyond accuracy and measurement time.

http://publik.tuwien.ac.at/files/PubDat_220254.pdf