For visualization of distributed hydrological phenomena, a multidimensional visualization tool such as VisAD embeds sophisticated visualization techniques in hydrological models. Heterogeneous hydrological properties can be visualized draped on top of a digital elevation model (DEM), in order to model parametrization or results.This article discusses how the VisAD library was applied to hydrology related information in the headwater catchments of the SchmiJcker Graben and the Steinbach utilizing DEMViewer. IntroductionVisualization plays an important role in simulation model development and application. The distributed variability of physiographic properties contributing to the river basin's hydrological budget needs to be reflected in a suitable visual representation. Sophisticated tools are required to visualize distributed entities. These entities have to be accessed relative to the relief of a given basin. Distributed hydrological models take into account a spatial distribution of factors controlling the hydrologic dynamic. In order to be able to analyze, interpret and compare spatial-related information from simulation and observation, software tools are needed which allow "ad hoc" assessment of this information.VisAD [2] is a scientific visualization library written in and for the Java architecture [3] to provide visualization of data using a flexible tool that assembles and arranges data sets in multiple dimensions.The application of VisAD in distributed hydrological modeling focuses on data models that enable the visualization of properties in a given location in a digital elevation model.With this goal in mind, software tools based on VisAD were developed to direct and simplify the application of VisAD in a hydrological sense. The DEMViewer is one result of this work, and is described in the Tool Application section. In the Background Hydrology section, the modeling background is described as the driving factor for the creation of the visualization applications.
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