Module 6 Scenario 2, Suitability and Least-Cost Analysis

Here we are at the end of Application in GIS course. This module was a biggie; it is broken up into 4 different scenarios dealing with suitability and least-cost analysis. There were many learning outcomes from this module to name a few being able to perform suitability analysis using both vector and raster analysis tools, preparing data for use in suitability analysis, being able to compare different approaches to suitability analysis, including Boolean and scoring. Comparing vector and raster tools to complete specific steps in suitability analysis and adjusting specific parameters employed in suitability analysis, such as scoring and weighting. 

In scenario 2 as a GIS Analyst for a property developer, we are tasked with rating the suitable locations and returning the results in a raster. Basing the analysis on, Land cover, Soils, Slopes, Streams, and Roads. The developer is thinking of buying some land to build a development on before it becomes a conservation area or before a pipeline gets put it. 

I started this analysis by editing the raster's using the Reclassify Tool and the Polygon to Raster Tool. Then creating a slope layer using the Slope Tool from the DEM raster. I used the Euclidean Distance Tool to obtain a raster of the distance from the roads and rivers layers. Then, I reclassified each raster using the Reclassify Tool and assigned a suitability rating between 1 and 5 for certain value ranges. Then, I used the Weighted Overlay Tool to create a raster that took into account the suitability rating from each input and created an overlay suitability rating for each pixel within the area of interest. I started with an equal weighting of 20% for each raster and then I created alternative weighted overlay output with altered weighting to explore how that impacts the final product. Below I have shared with you the Equal Weight and the Alternative Weight maps that shows the comparison.