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By Jurg Andreas Stuckelberger

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

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Finally protective structures against natural hazards (rock fall, mudflow, avalanches) which result in additional cost, is a third problem to be investigated for extreme area conditions. Chapter 2 Improved road network design models with the consideration of various link patterns and road design elements J¨ urg Andreas St¨ uckelberger, Hans Rudolf Heinimann, Woodam Chung Submitted: October 2, 2006 / Accepted: February 17, 2007 / Published: November 23, 2007 Canadian Journal of Forest Research 37: 2281–2298 c National Research Council Canada CHAPTER 2.

A first problem consists of stream crossings for which we implemented only the ford-case. In some sites bridges may be more appropriate. A second problem is the road location near sharp terrain edges and small channels for which a 10 m × 10 m grid resolution is inappropriate to map these small-scale terrain features. Finally protective structures against natural hazards (rock fall, mudflow, avalanches) which result in additional cost, is a third problem to be investigated for extreme area conditions.

Under real conditions, such patterns should be limited for two reasons. First, roads have to maintain a certain minimum-curve radius for driving comfort. Second, the construction of switchbacks entails additional cost. One approach for preventing this has been to penalize dramatic directional changes in road alignment (Anderson & Nelson, 2004). , 2001). However, none of these previous tactics has actually been used to map curvature constraints on a mathematical graph. 1b, 16 different directions are considered in the model.

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