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ABSTRACT
The increasing demand for electricity and global awareness of environmental impacts of large-scale projects, have brought to the fore high voltage overhead transmission line route selection as a crucial component of the power transmission line project life cycle. It is the aim of this study to select optimum path from available geographical space between Lafia in Nasarawa State and Abuja, the Federal Capital Territory for high voltage power transmission line using geographic information system, multi-criteria decision method (AHP), and environmental impact factors strategy. To achieve this goal, ArcGIS 10.1 image classification using landsat 8 satellite images was used to produce maps of land use, land cover, and other variables. To determine the land cover type, three major land features were classified namely; Built-up areas, Vegetation and Water bodies. Using a Landsat Band combination of five Near Infrared Radiation (5NIR), 4 (Red) and 3 (Green) a false coloured composite were generated and with the inbuilt colour judgment, vegetation appears as red, built-up area as yellow, and the water bodies appearing as blue etc. A model was developed for optimum route selection to evaluate numerous environmental factors and their relative weight determination which reveals respective level of influence on the proposed power transmission line using pairwise comparison, analytic hierarchy process (AHP) method and these were presented in GIS layers for visualizations. Prior to project installation, operation, and maintenance, all likely environmental issues were taken into considerations. One of the GIS functions, Dijkstra’s algorithm, was used to determine the least cost path from the corridor and finally ROW out of the selected three alternative routes.
