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| Titel |
Assessing the capability of terrestrial laser scanning for monitoring slow moving landslides |
| VerfasserIn |
A. Prokop, H. Panholzer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 9, no. 6 ; Nr. 9, no. 6 (2009-11-19), S.1921-1928 |
| Datensatznummer |
250007060
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| Publikation (Nr.) |
 copernicus.org/nhess-9-1921-2009.pdf |
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| Zusammenfassung |
Digital elevation models (DEM) are widely used to determine characteristics
of mass movement processes such as accumulation and deposition of material,
volume estimates or the orientation of discontinuities. To create such DEMs
point cloud data is provided by terrestrial laser scanning (TLS) and
recently used for analysis of mass movements. Therefore the reliability of
TLS data was investigated in a comparative study with tachymetry. The main
focus was on the possibility of determining movement patterns of landslides
<100 mm. Therefore, several post processing steps are needed and the
reliability of those were analyzed. The post processing steps that were
investigated include: (1) The registration process is a crucial step
considering long term TLS monitoring of an object and can be significantly
improved using an iterative closest point (ICP) algorithm; (2) Filtering
methods are necessary to create DEMs in order to separate favored laser
points on the terrain surface (ground points) from topographically
irrelevant points (non-ground-points). Therefore GIS tools were applied.
Surfaces with and without vegetation cover were differentiated; (3)
Displacement vectors are used to determine slope movement rates. They were
created from TLS data after the computation of true orthophotos.
Using the methodology presented it was not possible to determine movement
rates <50 mm per period. However, if the quality of the point density is
described and areas with very low point density are detected, reliable
conclusions can be made regarding slope movement patterns and erosion and
deposition of material for changes <100 mm for the investigated slope. |
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