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The history of digital terrain modelling started in the 50's. Digital terrain modelling is nowadays one of the basic ways of a terrain representation. The basic task of creating the digital terrain model (DTM) includes data collection, generation, visualization, interpretation and application. There can be various sources of data to generate DTM. The source data set is the basic element for the accuracy of the resulting model. There is also described a few series of tests on the accuracy of DEM source data. The co...