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| Titel |
Surveying accuracy of badland surface morphology in Central Spanish Pyrenees using a high resolution terrestrial LIDAR scanner |
| VerfasserIn |
Sandra Werb, Susanna Werth, Till Francke, Axel Bronstert |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250053098
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| Zusammenfassung |
| Terrestrial LIDAR scanning (TLS) serves as a monitoring tool to observe changes in surface
morphology for areas covering >103 m2 with a resolution for single scans of up to 5 mm.
Traditional measurement methods like erosion pins and Sedimentation Erosion Tables (SET)
can be used to document ground level changes on plot scale but face the drawback of a point
measurement and intervening into the area of interest. In contrast, TLS provide a
non-invasive three-dimensional surface observation, wherefore reference objects are arranged
along the boundaries of scanning sections. Data collected with TLS can be used
for both calculation of volumetric changes as well as documentation of surface
conditions (e.g. rill structure, surface roughness). Therefore they provide an ideal tool
to estimate sediment erosion rates of badlands, e.g. caused by rainfall and water
flows.
But to what extend does data processing affect the quality of the raw dataset? The
calculation of erosion rates by volumetric changes of intermittent measurements is a result of
a workflow consisting of a series of single steps that modifies the original pointcloud. We
therefore studied on the one hand the impact of accuracy of the realization of the
reference network as part of the fieldwork and on the other hand the effects of data
processing.
Our study area is the Isábena catchment (445 km2) located in the Central Spanish
Pyrenees. The catchment includes a large system of badlands being one of the major
sediment sources. So far we conducted several investigations of an experimental setup as well
as one survey within the study area in October 2010 using a Riegl VZ-400 observing the
surface conditions of a badland (19000 m2) which serves as one of the major sediment source
areas within the Isábena catchment.
In order to estimate the accuracy for future TLS derived volumetric changes within the
badland system, we present the results of our data processing uncertainty studies. |
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