DBPapers
DOI: 10.5593/SGEM2014/B23/S11.107

SIMPLE METHOD FOR INCORPORATION OF TOPOGRAPHICAL FACTOR INTO GIS-SUPPORTED MULTI-VARIANT RAIL ROUTE SELECTION

T.Pirowski, W. Drzewiecki, E. Orzinska
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-12-4 / ISSN 1314-2704, June 19-25, 2014, Book 2, Vol. 3, 841-852 pp

ABSTRACT
Geographic Information Systems are considered and used as a tool supporting designers in the process of linear infrastructure routing. In case of designing a railway or a road the terrain is one of the most important factors to be considered. The appropriate methodology of incorporation of topography-related issues into the analytic process is necessary for practical usefulness of the results. The paper propose simple method designed for this purpose. It uses the trend of terrain profile for minimizing the ruling gradient. It is also aimed at imitating the manual setting out of routes by a designer, tending to minimizing the number of intersections between designed route and contour lines. The results obtained in the test performed for a hypothetical suburban railway routing are presented. Besides the topography, the factors taken into consideration included other physiographic factors, formal and legal, environmental and economic conditions and criteria, such as legal protection of natural areas, water intakes, monuments, mitigation of the adverse impact of investment on inhabitants and the environment, considering the distribution of the existing road and river network in the area, location of the biggest clusters of population (which the designed railway line would provide service to), preference to geologically “safe” areas of favorable construction properties of the subsoil. For the purpose of joint consideration of design factors and barriers, the method of weighted linear combination was used, obtaining, at the first stage, the revised map of area suitability of the designed investment project, followed by maps of resistance (friction), accumulated values of resistance (costs) and optimum connections, such as linear structures and corridors. The adopted decision support tool enabled to generate additional variants of solutions, depending on the priority assigned to various groups of factors. The results obtained indicated high flexibility of the GIS tools for resolving the contradictory spatial decisions, requiring the simultaneous consideration of a large number of spatial conditions. The method/methodology proposed fulfilled the goals assumed, taking into account the land relief in the process of location of the linear rail investment.

Keywords: linear infrastructural object routing, geographical information systems, spatial analyses, terrain analysis

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