Abstract
Slope is a key parameter for regional scale hydrology, soil erosion, and relevant land surface process modelling. Slope information is usually extracted from moderate and lower resolution DEMs because of time and financial limitations. But research has shown that the slope will become flatter as the resolution of the DEMs becomes coarser. That is, slope reduction (SR) has occurred. Due to the reduction of slope as the DEM resolution becomes coarser, the slopes from coarser DEMs have to be re-scaled, firstly in order to represent terrain accurately and secondly to directly support the environmental modelling mentioned above. A transform approach by slope histogram matching is suggested in this chapter. A case study in a loess hill area shows that a coarser resolution slope histogram (derived from a 1:250,000 topographic based DEM), can be successfully re-scaled into the slope histogram at a finer resolution (using a 1:100,000 topographic based DEM). The transformed slope surface has been improved as an estimate of the finer resolution DEM slope in comparison with the coarser resolution DEM, the statistical results are similar to those from the finer resolution DEM in the loess hill area, and little new distortion has been introduced
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Qinke, Y., Jupp, D., Rui, L., Wei, L. (2008). Re-Scaling Lower Resolution Slope by Histogram Matching. In: Zhou, Q., Lees, B., Tang, Ga. (eds) Advances in Digital Terrain Analysis. Lecture Notes in Geoinformation and Cartography. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-77800-4_11
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DOI: https://doi.org/10.1007/978-3-540-77800-4_11
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