[Back]

B. Székely, G. Molnár, A. Roncat, H. Lehner, T. Gaisecker, P. Drexel:
"Integrating Airborne and Terrestrial Laser Scanning data to monitor active landsliding";
Poster: EGU 2009, Vienna; 2009-04-19 - 2009-04-24; in: "Geophysical Research Abstracts", 11 (2009), Paper ID EGU2009-3557-2, 1 pages.

Active slope processes often endanger various built-up objects and, as a consequence, sometimes human lives
as well. Data acquision on the status and evolution of such slopes, especially those that had already affected by
landsliding, therefore is a primary target for engineering geomorphic research.
The method of laser scanning provides an appropriate data collection technique with the requested accuracy.
Data from repeated Airborne Laser Scanning (ALS) campaigns are suitable to be analysed for the slow, incipient
movements of the slope. The problem of this surveying technique is that repetition time is strongly dependent on
the financial resources of the monitoring project, and often the requested recurrence of flight campaigns cannot be
achieved.
A possible solution to densify the data acquisition in time is the application of Terrestrial Laser Scanning (TLS)
and intergration of its data with ALS data sets. TLS has the advantage of flexibility and shorter observation
distances compared to ALS.
This technique needs special considerations and tedious processing since the geometric setting of the data
acquision considerably differ in TLS and ALS. Furthermore, obstacles in the landscape may partly hamper the
data acqusition which rarely the case in ALS.
Our case study area is a several-decade-long active landsliding in Doren (Federal State Vorarlberg, Austria)
that as it develops, it is about to endangers houses of the locality. The site is especially suitable for the project,
because multi-temporal data sets (from ALS flight campaigns in 2003, 2006 and 2007, respectively) of this area
are available.
The data integration is carried out in the form of production of point clouds (sensed from various points of the
valley sides) and we compared the results with the results of the previous ALS campaigns. With the planned
repetition of the TLS measurements new and detailed insights can be achieved concerning the evolution of the
incipient and on-going slow motions.
This project has been supported by the Austrian Academy of Sciences (ÖAW) within the framework of scheme
¨ Geophysics of the Earth´s crust¨ , Riegl GmbH generously provided a full-waveform terrestrial laser scanning
device.

http://publik.tuwien.ac.at/files/PubDat_175575.pdf