GIS Based Route Alignment Selection Between Dabat and Keraker Towns
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Date
2020-10
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Addis Ababa University
Abstract
Road network connectivity improves socio-economic development and functionality as
well as quality of life through enabling sustained and all-inclusive growth. It also enhances
mobility of people and goods providing access to market - value chain and services on top
of creating an opportunity to discover our most valued resources such as land. However,
practical aspects of road network optimization require designing best route alignment
selection. Usually, route alignment selection is governed by many factors. Multi-criteria
decision analysis is well adopted method that considers the effect of various factors such
as engineering, social, economic and environmental factors on route planning. The aim of
this study is to use a multi-criteria approach specifically Analytic Hierarchy Process (AHP)
pairwise compression analysis for route planning that connects Dabat and Keraker towns
located in northern region of Ethiopia. The operations to select the least cost route depend
on the effective collection, processing, storing and analysis of spatial data such as slope,
drainage, land use, soil type, geology, existed road and drainage. The weight overlay
analysis was considering seven factors that affect route planning. The value of the factor
is unique because of distinctiveness of geographic, socio-economic, and environmental
situations of the study area. The results suggest that the first governing factor for the route
selection in the study area is slope. While fault and soil are the second and third most
governing factors for the road alignment selection, respectively. The length of the
proposed route is 65 km compared to the existing road of 90 km length. The new alignment
is 34 km shorter than the existing road, implying the novelty of the multi criteria approach.
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Keywords
Route selection, Multi-Criteria Decision Approach, factors governing route selection