In: Wagner W., Székely, B. (eds.): ISPRS TC VII Symposium - 100 Years ISPRS, Vienna, Austria, July 5-7, 2010, IAPRS, Vol. XXXVIII, Part 7B
Figure 6. In situ validation of VRM C .
6. CONCLUSION AND OUTLOOK
In this paper a novel approach of data classification and
revaluation was presented with the focus on identifying
‘roughness’ on various vertical levels in wooded areas.
Roughness parameters and corresponding raster layers were
calculated and jointly analyzed in order to develop a novel
roughness classification scheme considering the entire vertical
structure of vegetation from surface to treetop. This
classification procedure can be outlined as vertical roughness
mapping (VRM).
Results of the roughness classification were cross-validated
against collected in situ reference data indicating a high level of
thematic accuracy. As follow-on analysis several ways of
smoothing the VRM C raster files (i.e. information-preserving
‘intelligent’ generalization) will be tested in order to derive
areal roughness hot spots useful for terrain related hazard
assessments (e.g. water hazards, mass movements).
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ACKNOWLEDGMENTS
The presented research was funded by the Austrian Research
Promotion Agency (FFG) in the frame of the Austrian Space
Applications Programme (ASAP). The ALS data was kindly
provided by the “Amt der Niederösterreichischen
Landesregierung, Gruppe Baudirektion, Abteilung Vermessung
und Geoinformation“.
