A physically-based method for removing pits in digital elevation models |
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| Authors: | Salvatore Grimaldi Fernando Nardi Francesco Di Benedetto Erkan Istanbulluoglu Rafael L Bras |
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| Institution: | 1. GEMINI Department, University of Tuscia, Via San Camillo De Lellis, 01100 Viterbo, Italy;2. Dipartimento di Idraulica, Trasporti e Strade, Universitá degli Studi di Roma La Sapienza, Via Eudossiana, 18, Rome, Italy;3. Honors Center of Italian Universities (H2CU), Universitá degli Studi di Roma La Sapienza, Via Eudossiana, 18, Rome, Italy;4. Department of Geosciences and Biological Systems Engineering, University of Nebraska-Lincoln, 200 Bessey Hall, Lincoln, NE 68588, USA;5. Department of Civil and Environmental Engineering, Rafael L. Parsons Laboratory, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Room 48-211, Cambridge, MA 02139, USA |
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| Abstract: | Spurious pits in digital elevation models (DEMs) are traditionally removed by filling depressions, often creating flat regions that lead to inaccurate estimation of landscape flow directions. In this study, a physical approach based on a simple landscape evolution model is proposed for DEM pit removal. This method, an alternative to traditional geometrical procedures, enforces more realistic slopes and flow directions on topography. The procedure is compared with the method most commonly used in the literature and distributed with commercial GIS software where, generally, elevations of a depression are increased up to the lowest value among neighbouring cells. Several tests are performed and parameters sensitivity is carried out in order to demonstrate the performance of the proposed model as compared to traditional methods. |
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| Keywords: | Geographical Information Systems GIS Digital elevation models DEM Pit filling Depressions in DEMs Sinks in DEMs Errors in DEMs Landscape evolution models Drainage networks |
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