TY - JOUR
T1 - Geomorphometry of cerro sillajhuay (Andes, Chile/Bolivia)
T2 - Comparison of Digital Elevation Models (DEMs) from ASTER remote sensing data and contour maps
AU - Kamp, Ulrich
AU - Bolch, Tobias
AU - Olsenholler, Jeffrey
N1 - Funding Information:
The authors like to thank H. Schröder and G. Kröber, University of Erlangen-Nuremberg, Germany, for support in the field, J. Böhner, University of Göttingen, Germany, for solar radiation calculations, and S. Röttger, University of Stuttgart, Germany, for providing the interactive terrain renderer. The corresponding terrain-rendering library is distributed under the terms of the LGPL and can be downloaded from http://wwwvis.informatik.uni-stuttgart.de/ ~roettger. Part of this project was funded by the Max Kade Foundation, New York.
PY - 2005
Y1 - 2005
N2 - Digital elevation models (DEMs) are increasingly used for visual and mathematical analysis of topography, landscapes and landforms, as well as modeling of surface processes. To accomplish this, the DEM must represent the terrain as accurately as possible, since the accuracy of the DEM determines the reliability of the geomorphometric analysis. For Cerro Sillajhuay in the Andes of Chile/Bolivia two DEMs are compared: one derived from contour maps, the other from a satellite stereo-pair from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER). As both DEM procedures produce estimates of elevation, quantative analysis of each DEM was limited. The original ASTER DEM has a horizontal resolution of 30 m and was generated using tie points (TPs) and ground control points (GCPs). It was then resampled to 15m resolution, the resolution of the VNIR bands. Five parameters were calculated for geomorphometric interpretation: elevation, slope angle, slope aspect, vertical curvature, and tangential curvature. Other calculations include flow lines and solar radiation. Although elevations are too low above 5000 m asl., the ASTER DEM offers reliable results when analyzing the macro- and mesorelief, and for mapping at medium scales (1:100,000 to 1:50,000).
AB - Digital elevation models (DEMs) are increasingly used for visual and mathematical analysis of topography, landscapes and landforms, as well as modeling of surface processes. To accomplish this, the DEM must represent the terrain as accurately as possible, since the accuracy of the DEM determines the reliability of the geomorphometric analysis. For Cerro Sillajhuay in the Andes of Chile/Bolivia two DEMs are compared: one derived from contour maps, the other from a satellite stereo-pair from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER). As both DEM procedures produce estimates of elevation, quantative analysis of each DEM was limited. The original ASTER DEM has a horizontal resolution of 30 m and was generated using tie points (TPs) and ground control points (GCPs). It was then resampled to 15m resolution, the resolution of the VNIR bands. Five parameters were calculated for geomorphometric interpretation: elevation, slope angle, slope aspect, vertical curvature, and tangential curvature. Other calculations include flow lines and solar radiation. Although elevations are too low above 5000 m asl., the ASTER DEM offers reliable results when analyzing the macro- and mesorelief, and for mapping at medium scales (1:100,000 to 1:50,000).
UR - http://www.scopus.com/inward/record.url?scp=33746641278&partnerID=8YFLogxK
U2 - 10.1080/10106040508542333
DO - 10.1080/10106040508542333
M3 - Article
AN - SCOPUS:33746641278
VL - 20
SP - 23
EP - 33
JO - Geocarto International
JF - Geocarto International
SN - 1010-6049
IS - 1
ER -
