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Seilaplan

The QGIS plugin Seilaplan is a GIS-based forest management support tool for designing and optimizing rope line layouts. It was developed in 2012 as part of Dr. Leo Bont's dissertation at ETH Zurich and has been under further development by him at the Swiss Federal Institute for Forest, Snow and Landscape Research WSL since 2017.

The abbreviation "Seilaplan" stands for rope crane layout planner. Using defined start and end coordinates, machine data and other technical rope line parameters, the tool calculates the optimal rope line layout based on a digital elevation model. The position and height of the supports, as well as the most important characteristic values of the rope line are determined. The load path curve is calculated using Zweifel's (1960) algorithm, a catenary method. In the research project "New Foundations for Efficient Rope Line Planning" completed in 2020 by the Sustainable Forestry Research Group (WSL) under the direction of Dr. Leo Bont, calculations of load-path curves according to Zweifel (1960) achieved significantly more accurate results than with the widely used method of Pestal (1961).