The Czech Republic DSM 1, the quality of the model in areas covered by vegetation and possibilities of its use for visibility analysis

Visibility analysis is in the military but also in other sectors one of the main activities for data collecting about objects of interest in terrain. Choosing observation spots may be random or based on a sophisticated selection. This selection is usually based on an analysis of geographic data. Digital surface model (DSM) is the key data model that is used for modelling visibility. These models are usually created by combining digital elevation model (DEM) and geodatabases containing information about ground objects. From 2016 is in the Czech Republic available DSM 1 which was created as a by-product of new DEM generation which were created by using airborne laser scanning technologies. The fundamental object in terrain that affects observation is vegetation. Verification of vegetation display in DSM pointed to problems in some areas. The main outcome of this work is to identify these locations, propose possibilities of removing the problems and use DSM for visibility analysis.