Comparison of the quality of thalweg lines extracted from data of DMR 4G, DMR 5G and its derivatives
Determining the gradient of watercourses in the case of local applications is a common problem, which is most often dealt with by geodetic surveying. However, determining the gradient of all watercourses in the Czech Republic is a challenge. The use of geodetic methods on such a scale is usually unrealistic. Therefore, it is necessary to choose a different approach, such as the extraction of the gradient lines from other already existing elevation data. The DMR 4G and DMR 5G are elevation models currently available for the Czech Republic. For the extraction of gradient lines, it is necessary to create a digital terrain model (DTM) from the available datasets. Various interpolation methods are used for this. But which of the available interpolation methods is the most suitable? What role does the size of spatial resolution play in the quality of altimetry representation and subsequent sizes of the stored DTMs? To find answers to these questions, we chose four study sites (fourth order catchments) in the Otava river basin. Eight different DTMs were then created at each site, which were then compared. The results show that choice of raster size has a significantly greater influence on the resulting quality of the gradient lines than the choice of interpolation method in the case of DTM creation from DMR 5G data. DTM from DMR 4G data gives worse results than from DMR 5G at the same raster resolution.
Identification of non-point agricultural pollution using thermographic imaging
Water quality monitoring has a much shorter history in the Czech Republic (CR) than water quantity monitoring. Yet the quality of water resources is crucial for society, industry and agriculture.
Matematické stanovení batymetrie vodního toku – software Bathy_supp
Topografické údaje hrají klíčovou roli v otázce přesného hydrodynamického modelování povodňových událostí. Často je vyžadován přesný digitální model terénu (DMT), který obsahuje popis říční batymetrie. DMT může být získán z různých zdrojů dat, jako jsou pozemní měření nebo metody dálkového průzkumu země.
Bathymetric measurement for determination of morphology of water reservoir bottom
Information and communication technologies are currently one of the decisive factors influencing economic and social development. Similar developments and trends in relation to information and communication technologies can be observed in the field of water management.
