This thesis addresses the identification of auxiliary fortification elements in Sector VI. of the Rupnik Line, a defensive system of the Kingdom of Yugoslavia, using remote sensing methods. The first part presents the political and historical context in which the defensive line emerged, compares different European fortification concepts, and describes in detail the layout, construction process, and purpose of the Rupnik Line, with particular focus on Sector VI. In the second part, LiDAR point clouds from seven sample areas are used to identify and digitise rifle trenches; their strategic positioning and spatial distribution are compared, a viewshed analysis is carried out, and the accuracy of the applied method is evaluated. The results reveal differences in the strategic arrangement of the trenches, which may represent a way of closing gaps in the fortification system, forming a secondary line of defence, or supporting a specific permanent fortification structure.
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