SMT201 AY2018-19T1 EX2 Tan Jie Ting Christine
Contents
Part 1: Map Layers
Gombak and the Target Roads
Gombak and Buildings
Gombak and the Target Natural Features
Gombak and Digital Elevation
Part 2: Decision Factors
Economic Factor
The selected site should avoid steep slope. This is because construction at steep slope tends to involve a lot of cut-and-fill and will lend to relatively higher development cost. According to Legal Eagle Contractors, Co. [1], "Less than 10% incline is considered slight and is the easiest to build on, while 11-20% is considered moderate. Anything above 20% is deemed steep.". Hence, I used that as the measure to deem if an area is too steep for building the site.
Using the following matrix, I used a ranked model to compute a score for the economic factor.
| Percentage of Incline | Score |
|---|---|
| Less than 10% | 2 |
| 10-20% | 1 |
| More than 20% | 0 |
Accessibility Factor
The selected site should be close to existing local roads, namely: service roads and tracks. This is to ensure easy transportation of building materials during the construction stage. I assume that for the site to be accessible, the site must be at least 200m away from local roads. I used a binary model, where I gave a score of 1 for the areas that were within 200m from a local road, and a score of 0 for the areas that were more than 200m away from a local road.
Health Risk Factor
The selected site should be away from population i.e. housing areas and offices in order to avoid disease spreading to the nearby population. I assume that for the site to be sufficiently far away from buildings, it needs to be minimally 250m away from buildings. I used a binary model, where I gave a score of 1 for the areas that were at least 250m away from buildings, and a score of 0 for the areas that within 250m away from a building.
Natural Conservation Factor
The selected site should be away from forested land, park and water. I assume that for the site to be sufficiently far away from natural conservation sites, the site must be at least 200m away from natural sites. I used a binary model, where I gave a score of 1 for the areas that were at least 200m away from natural sites, and a score of 0 for the areas that within 200m away from a natural site.
Final Output
I used the Raster Calculator to calculate the final scores to deduce where would be the best area to build the site, with the formula "Economic@1" + "Accessibility@1" + "HealthRisk@1" + "Natural@1", where the variables refer to the factors as listed above respectively.
References: [1] https://legaleaglecontractors.com/building-house-on-slope-challenges/
