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Error map of landslide model resulting from the adoption of different methods for the definition of displacement fiel

Wyczałek I.

Reports on Geodesy

2011

z. 1/90

531--536

A vast area of landslide topped by a road, required tacheometric survey of marked points. As a result of repeated surveys the displacement vectors were obtained for each observed mark. Assuming that the points are a representation of spatial phenomenon, the map of movements of entire slope was carried out using two methodological approaches - the nearest neighbor (NN), in which weights to near lying observed points are much more important than to the more distant, and kriging, which describes the modeled phenomenon statistically. These approaches, like the most approximation techniques, base on the global nature of the phenomenon. In the meanwhile in not marked zone of described landslide the surface had been folded. In such cases the better is to take into account the aroused skeletal lines. The approximation techniques do not allow this. It was done using own algorithm TeMCA, which implements the method of cartographic cellular automata for surface modeling. The purpose of this study is to analyze differences between various ways of description of slope movements defined by both conventional methods and to compare them to the results of the TeMCA method which should better comply the nature of the landslide. Analyses were performed on synthetic data in order to avoid the impact of survey errors. The results of modeling have been elaborated in a graphical form and the distances between the different models were calculated for all cells of the grid. Maps of errors have been generated by taking into account the visualization of model errors. The conclusions focus on errors of interpretation of the results obtained by considered methods of modeling.

Digital terrain model comparison based on the direct satellite measurement and direct tacheometric measurement

Pająk K.

Reports on Geodesy

2009

z. 2/87

301-307