A Weighted-graph Optimization Approach for Automatic - download pdf or read online

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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6 shows an entity-relationship model of the data. 1. 2 Geotechnical parameters Engineering and cost properties are specific for each geotechnical unit. , Eq. 10), six parameters for construction costs (excavation cost (cexc ), cost for emplacement and compaction of the filling material (ccomp ), additional cost for rock excavation (crock ), cost for pavement structures (cpav ), cost for retaining walls (cwall ), and cost for drainage structures (cdrain )), and two parameters for maintenance (constant cost per road length (c0ann ), and variable cost proportional to the road gradient (c1ann ) and road length).

15) cost for single culvert cost for drainage structure distance between ditch relief culverts (in the present model, = 50 m) length of road segment Life-cycle cost model Life-cycle costs entail those for construction, routine and periodic maintenance, rehabilitation, and decommissioning. The model analyzed here did not consider the last two factors, and assumed the maintenance cost to be dependent only on road gradient and geology. This assumption, however, differs from practices in the USA and in Canada, where thresholds for total traffic volume trigger periodic maintenance.

The road type is linked to the geotechnical unit and defined by the parameters maximal allowable road gradient (ηmax ), minimal radius in curves (rmin ) and switchbacks (rSB ), standard road surface width (ws0 ), width for ditch and shoulders (wd+s ), road widening in curves (kcw ), and minimal excavation depth for pavement structures (zmin ). 2). 0 software (Object Pascal language), which produced approximately 3700 lines of code. Input and output data consisted entirely of text files that could be easily imported from or exported to commercial geographical information systems, such as ESRI ArcGIS.

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


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