SMT201 AY2019-20G1 EX2 Tan Kin Meng

Objective: Identify a location suitable for building a national Communicable Disease Quarantine Centre in Bukit Gombak (Singapore)

The selected site must be located at Gombak planning subzone, with a contiguous area of at least 10,000m2 and it must meet the following 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.
• 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.
• 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.
• Natural conservation factor: The selected site should be away from forested land, park and water.

Target roads, Buildings, Target Natural Features and Digital Elevation

A short description of not more than 100 words for each view.

Each layer was created by extracting the respective features and clipping them with the Bukit Gombak study area. The Bukit Gombak study area was extracted from the Master Plan 2014 Subzone Boundary from URA found on Data.gov.sg [1]

Target roads

For the target roads layer, we are tasked to analyse only service roads and track. Hence, I extracted the service and track layers and clip them with the Bukit Gombak study area, already extracted, to create the layer for target roads. As evident from the map, service road networks are more extensive in the North Eastern parts of Bukit Gombak.

Buildings

For the buildings layer, there are only a few types of buildings in the area and they are namely garage, construction sites, residential areas and public institutions. However, there are many buildings that are categorized under “Others” and by using the Open Street Map view, I can identify that some of these land uses are used by the military. This is relevant for the analysis later as we need to be aware that we might be building the quarantine area in the military camp.

Target Natural Features

For targeted natural features, I simply extracted the selected areas by clipping to the study area Bukit Gombak.

Digital Elevation

For the digital elevation layer, it was created by extracting the ASTER Global Digital Elevation Model (GDEM) dataset jointly prepared by NASA and METI, Japan according to the study area Bukit Gombak. After which, I used singleband grey for band rendering to show the elevation of Bukit Gombak. The map shows that the elevation increases gradually from north to the south of Bukit Gombak and peaks in Bukit Panjang camp as seen in the Open Street Map (OSM).

Data for the Digital Elevation Model was obtained from: [2] and compiled by Professor Kam Tin Seong.

Proximity and slope

Brief overview of proximity and slope

For this section of analysis, the steps taken were to first rasterize each of the layer (roads, buildings, and natural features) and then with the rasterized layers I analyse the proximity (Raster --> Analysis --> Proximity (Distance)). The choice of the colors and band rendering were blues and discrete (instead of continuous) as I think that the proximity limits can be observed more clearly with discrete. Each of the layer’s distances were also calculated by quantiles and sorted into 5 classes.

A short description of not more than 150 words for each view.

Proximity to target roads layer

As observed, most areas of Bukit Gombak are below 135.87m away from the roads, this also means that most areas of Bukit Gombak are relatively accessible from the roads.

Proximity to buildings layer

As observed from the map, in the northern parts of Bukit Gombak, the buildings are densely positioned. As proximity to buildings affects the rate at which diseases spread, it may not be a feasible idea to build the quarantine area in the northern parts of Bukit Gombak. In contrast, in the southern parts of buildings layer, there are spaces which are further away from buildings (> 41.1metres) away from buildings. The furthest spaces away from buildings are approximately 300 to 400 metres. This must be taken account in the selection of our quarantine site.

Proximity to target natural features layer

This factor aims to conserve natural features such as parks, forested land, and water areas. As observed in the map, it can be observed that most areas are less than 40m away from a natural feature, with the maximum distance being at 103.22 metres away from the nearest natural features, which are toward the south eastern part of Bukit Gombak

The study area and slope layer

The slope affects the elevation which will, in turn, cause the development costs to be higher. Hence, slope should be avoided. Observing from the map, the elevated parts of the slope (as indicated by the white areas of the map), seem to be positioned in the central of Bukit Gombak and the corner areas of the map are flatter (as indicated by the darker areas). Hence, it might be more feasible to locate the site near the periphery of Bukit Gombak

A map layout with four views showing the criterion scores of each factor layers and a short description of not more than 150 words for each view

Analytical Hierarchical Process (AHP) analysis

An Analytical Hierarchical Process input matrix and result report and a short description of not more than 150 words discussing the analysis results.

Analytical Hierarchical Process input matrix

Suitability land lot

A map layout with the suitability land lot(s) and a short description of not more than 200 words commenting on each of the suitable land lot identified.

Land Lot Suitability Assessment

Area of land Identified

Fulfilling the criterion of a minimum of a contiguous land area of 10000m²