Jurg Andreas Stuckelberger's A Weighted-graph Optimization Approach for Automatic PDF

By Jurg Andreas Stuckelberger

ISBN-10: 3728132179

ISBN-13: 9783728132178

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Extra resources for A Weighted-graph Optimization Approach for Automatic Location of Forest Road Networks

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Because of this, the link pattern used in road network models becomes important, especially in steep terrain. In order to connect two terminals (mandatory access nodes) with a large elevational difference, one should find the road route with a centerline gradient (nroad ) nearest the maximum allowable value (nroad = nmax ). Then again, the strict application of gradient constraints (nlink ≤ nmax ) to each single link gradient (nlink ) often results in the average gradients of the centerline (nroad ), which are usually below the maximum allowable link gradient (nroad < nmax ).

2). In this study, the minimum radius has been set at 20 m for regular curves and 10 m for switchbacks. Representation of such constraints requires one physical node to be split into 16 virtual nodes. Thus, the corresponding mathematical graph can be displayed three-dimensionally (3-D), consisting of 16 virtual layers, each of which maps one directional class. 3 illustrates this 3-D approach for turnings of different road links. Node O represents an incoming node, while Nodes A, B, C, and D represent potential intermediate control points, depending on the road direction.

7 illustrates the spatial variability in road life cycle costs for Scenario III, which considered both slope gradient and geotechnical soil properties. 8 presents the variability of life-cycle cost per unit for the three model scenarios as cumulated frequency curves. Scenario I assumed a route independent cost of 240 CHF m . Therefore the variability is zero, resulting in a vertical straight line of cumulated frequency curve. 9 ) (Tab. 4). The cumulated frequency curve represents more or less the distribution of the slope gradients in the project area.

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A Weighted-graph Optimization Approach for Automatic Location of Forest Road Networks by Jurg Andreas Stuckelberger


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