LEAST-COST PATH MULTI-CRITERIA DECISION ANALYSIS ON SUMATERA HIGH-GRADE HIGHWAY ROUTE PLAN
Case Study for Banda Aceh-Sigli Section
The Sumatera High-Grade Highway (HGH) project is an ambitious national project that would provide
Sumatera with a high-quality first-class arterial road network connecting all provinces, regional economic centres, and major seaports and airports of the island. One of many challenges faced during HGH planning is in determining route candidate that would be the most cost-effective option under various considerations. In this study, an integrated Least-cost Path Analysis (LCPA) and Multi-criteria Decision Analysis (MCDA) was exercised in a Geographic Information System (GIS) to draw the most cost-effective routes for Sumatera HGH based on a series of scenarios. In each scenario, seven aspects were considered to form a cost-weighted raster map: geological formation, geological structure, peak ground acceleration due to an earthquake, topography, water body (mainly river order), land use, and forestry. Four scenarios were set up to develop four route candidates; each reflecting a different weighing set of the aforementioned aspects. In the next step, the routes a route plan suggested by previous studies were compared and ranked segment-by-segment to determine the most suitable HGH route candidate. This paper reports the developed LCPA-MCDA method by taking one section connecting Banda Aceh and Sigli, which is a part of Medan – Aceh Toll Road Plan.