The visualisation of various elements, phenomena or processes - whether it represents mere word or one of the top outcomes of human (technical) imagination – has always pertained to the most important and the most illustrative results in a great number of scientific researches. The same situation also exists in geo-scientific disciplines (here we talk about geovisualisation, i.e. visualisation of geodata), where the products of geovisualisation represent one of the most illustrative outputs for lay and professional public. Here the GIS (Geographical Informative Systems), in cooperation with many predominantly graphic programmes, are used in a still growing measure.

For the present epoch, characteristic by rapid development of virtual reality, is also typical the quick development of geovisualisation for both scientific purposes and for the needs of the public at large. 3D visualisation and the classic 2D visualisation of data allow us, in connection with GIS, to reach not only new and better ways of their presentation. They also bring us many possibilities of more effective views on their mutual spatial relations or they provide us with a picture about their mutual interactions. In my dissertation, I would like to present the possibilities of visualisation of geodata, more specifically of geomorphologic processes in GIS area.

The aim of my dissertation is the visualisation of potential and topically affecting geomorphologic processes. I tried to visualize the processes that are topically affecting the area of the commissioned map sheet ZM10: 25-33-05, which is situated in the region of Outer Western Carpathian Mountains, in the central part of Vizovice Highlands. The described processes are concretely the motion of slopes and water and wind erosion (for that matter, they represent the predominant geomorphologic processes in the area of the Czech Republic and they also cause the greatest economical damages). This dissertation also includes a proposal of the caption of active and potential slope changes itself. The caption was subsequently used in the final visualisation.

The using of GIS became the basics for the accomplishment of set aims. Primarily, it was necessary to obtain needed data. This data were provided by ČUZK (ZABAGED, ortophoto) and ČGS (coatings of landslides). Next step lay in the creating of the already mentioned caption. Then it was possible to proceed to the creation of visualisations. ArcGIS 9.1 was used as the main tool for their shaping. Important part of the thesis is the Internet presentation, which contains an interactive map of slope deformations on ZM: 25-33-05.

The visualisation of slope deformations runs in two mutually refilled ways – in 2D and 3D. The created 2D map shows their action and spatial spread in a specific region and gives a highly synoptic and self-contained view to these problems. Of course, the map was refilled also with other elements (for example the shadow relief), which serve for the most impressive appearance. But for visualisation in 3D I decided to choose a different form. In this case I concentrated on a certain region (I tried to choose regions with most expressive action of initiate phenomena) and I accomplished subsequent 3D visualisation. The final outputs are, in my opinion, appropriate illustration of the way of demonstration of  geomorphologic processes with the using of 3D tools of GIS.

The water and wind erosion became the next visualized geomorphologic process. First of all, it was necessary to accomplish a calculation or their values by relevant equations. But also the choice of relevant equations was very important. Finally, I chose USLE (Universal Soil Loss Equation) and USPED (Unit Stream Power – based Erosion Deposition) for water erosion and RKPVVE (Equation of complex examination of all influences of wind erosion) for wind erosion. The created visualisations have two forms again. The classical 2D illustration provides a perfect view of a spatial spread of erosion. From this we are able to determine the size of certain process in any chosen locality. 3D isometric view is an appropriate addition. This view shows us, except the presentation of visualized process, another refilled information. For example, we can better understand the spatial spread of erosion and sedimentation. The using of ortophoto was very important element too. It is an excellent tool for understanding the influence of the terrestrial surface cover on the aforementioned processes.

The creating of the interactive map (ArcIMS) of slope deformations belonged to the closing acts. This map is a part of the Web presentation included in my dissertation.

Finally, I should like to express hope that this dissertation will become an inspiration and source of information for everyone, who is interested in this issue from either professional or lay point of view.