Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLI-B2, 235-239, 2016
https://doi.org/10.5194/isprs-archives-XLI-B2-235-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
 
07 Jun 2016
ANALYSIS OF THE PIT REMOVAL METHODS IN DIGITAL TERRAIN MODELS OF VARIOUS RESOLUTIONS
S. Šamanović1, D. Medak2, and D. Gajski1 1Faculty of Geodesy, Institute of Cartography and Photogrammetry, Kačićeva 26, Zagreb, Croatia
2Faculty of Geodesy, Institute of Geomatics, Kačićeva 26, Zagreb, Hrvatska
Keywords: Pit removal, DTM, photogrammetry, carving method, filling method, geomorphometry, hydrology Abstract. Digital terrain model (DTM) is the base for calculation of the surface runoff under the influence of the gravity (gravity flow) in hydrological analysis. It is important to produce hydrologically corrected DTM with the removed natural and artificial depressions to avoid numerical problems in algorithms of the gravity flow. The pit removal procedure changes geomorphometry of the DTM. GIS software packages use pit removal algorithm independently of geomorphmetric features of the analyzed area. In need of minimally modified DTM after the pit removal areas, the carving method (deepen drainage routes) and the filling method (fill sink) were analyzed on three different geomorphometric areas (bare mountain range, hilly wooded area and the plain area intersected with the network of the drainage canals). The recommendation is given for the choice of geomorphometric least changing DTM algorithm. The input data are raster data of elevation points created by stereoscopic photogrammetry method in 5x5 and 25x25 meter resolution. Differences have been noticed during the process of creating raster data. The recommendation is given for the choice of the most acceptable method for each type of area on the basis of comparison of the original elevation points with the elevation points in created DTM.
Conference paper (PDF, 728 KB)


Citation: Šamanović, S., Medak, D., and Gajski, D.: ANALYSIS OF THE PIT REMOVAL METHODS IN DIGITAL TERRAIN MODELS OF VARIOUS RESOLUTIONS, Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLI-B2, 235-239, https://doi.org/10.5194/isprs-archives-XLI-B2-235-2016, 2016.

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