The purpose of the thesis was to show the possibility of changing visibility of transmission line, creating powerline clearings and changing the length of forest edge, taking into account the different heights of trees (between 5 and 35 m). The section of transmission line between Hrušica plateu and Postojna basin was selected. The length of section was 11.024 m. The analysis included 30 standing places. Viewport of transmission towers covered 33,7 % (4823,3 ha) of total calculated area. The viewport of two imaginary spatial placments of transmission line covered 2395,1 ha and 3586,2 ha. The viewport of the second variant was grater than the viewport of existing transmission line. The average proportion of the visible area of different transect width was 30,3 %.The area of visibility comprised 4395,5 ha, at specified height of trees 35 m. Unified width of corridor (40 m) was evident with 4327,5 ha. Number of harvest locations has decreased with the size of the trees. Maximum surface of clearings (39,9 ha) and the length of forest edge (15 km) was calculated for height of trees of 35 m. The differences in the length of forest edge and surface of removals has decreased by the height of trees.
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