Józsa E., Fábián, Sz., Varga, G., & Varga, T. (2014). Peculiarities of topography modeling of flat surfaces separated by steep slopes on the example of high Danube banks. Modern Geográfia, 9(2), 1–20.
The high bluffs along Danube with frequent steep slopes imply challenge during digital surface mod- elling. Free GIS software distributed under GPL offer several solutions to interpolate in raster from contours, but problems can be managed at different levels. Collecting available methods, evaluating calculated elevation models and verifying them with field measurements and DDM-5 data provide new information on topic. The results of the research reflected on the deficiencies of DDM-5 on the high bluff areas. The contour lines to DEM interpolation methods adviced by the “GRASS GIS Community” presented different results with the circumstances of the examined terrain. The „Natural Neighbor” method managed the problem of high bluffs well, however the „Raster Contours” method proved less suitable. Detailed description for preparing and correcting contours and for implementing of elevation modelling, moreover introducing applicable tools can serve as a guide for further studies to choose adequate tools and methods.
Keywords: surface modeling, validation, Danubian bluffs, GNU GPL GIS, DEM