On topographic maps, contour lines are used to show the relief. In the past they were made analogously whereas nowadays they can be generated by various software tools. For less varied relief, modelling results are acceptable, but often unsuitable for modelling demanding karst relief. We have found the optimal choice of the elevation model and compared the results of the above-mentioned tools. Among the latter we have chosen the one that most closely resembles the relief on the selected topographic map. The aim was to improve it by using the chosen programming language in order to get as close as possible to the course of the lines shown on the national topographic maps. The developed algorithm was tested in four selected areas.
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