The Polish national IT crisis management system for protection against extreme hazards (ISOK), which was created to increase the protection of people and property, produces two-dimensional data. The development of information technology has made it possible to visualize spatial data using 3D GIS systems. However, detailed visualization requires the integration of spatial data that comes from different sources, e.g. from direct land-surveying measurements, laser scanning data, aerial photography, orthophotomaps and other photogrammetric products, as well as sites from various databases, in particular from topographic databases. This paper presents a concept and the results of three-dimensional visualization of hydrodynamic modeling for a section of the Widawa River valley. The digital terrain model from airborne laser scanning was used and was overlaid with the texture of an orthophotomap. Spatial data was supplemented with three-dimensional models of buildings and trees that were taken from the publicly-available Google 3D Warehouse gallery. Visualization of the hydrodynamic modeling was done using the constructed spatial model. The integration and visualization of data was performed in ArcGIS software using the ArcScene module.

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