The master thesis deals with the smallest unit of the landscape, still considered a landscape, i.e. avenue of trees. It is one of central elements of the green area planning in the city. Its role in the space is border-defining, space-creating, connecting and separating, it has a significant impact on the quality of the space, it enriches the planned space. With a historical review of the avenue, its origin and development, the thesis tries to define its role in planning and is spatially limited to the analysis of avenues in the Municipality of Ljubljana. It presents a chronological overview of the changing roles and factors that influenced avenues through time, and describes where the tree avenues were created in the city. Analysis is made reviewing primary sources and some important historical maps on which tree avenues have already been drawn. Historical maps of the city’s planning represent the basis for reconstruction maps in different periods. The macro view of Ljubljana is additionally supported by analyses of the roles of individual avenues in different periods. The space is presented through different historical periods in different scales, we described its visual changes, the role of the tree lines in the given space as well. Concepts such as tree line, landscape element, green area, landscape, and green system are closely related to each other - from the smallest unit to the largest systems that build the city’s image. The entire system cannot be treated as a single layer, as it is made of multiple layers that only work if its smallest unit works. The role of avenues in the Municipality of Ljubljana has changed significantly and has been reduced throughout history to the present days. Current planning and the perception of green elements have changed, which is a reflection and consequence of the profit oriented planning and construction of the city. The solution to this problem remains unknown, but the thesis, nevertheless, tries to answer the question, how much did the role of green elements subordinate to the built elements, which offer nothing else but a luxurious façade of wasted space.
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