SMT201 AY2019-20G2 Ex2 Lu Zhimao

TAKE HOME EXERCISE 2

Part One: A map layout with four views

The study area and the target roads

Using Selection by Location feature, I extracted the roads that falls within Gombak study area, followed by the filtering of roads to sieve out the relevant roads namely – service and track which are depicted by the colors blue and purple respectively. There are a total of 199 services roads and 2 track roads where most of the roads are located towards the right-hand side of the study area.

The study area and buildings

Using Selection by Location feature, the extraction of the buildings is done. Buildings are generally in clusters except for a few which are built at a higher elevation. The buildings located at the lower elevations might be more easily accessible by more roads due to lesser slopes and more road connections as opposed to the buildings at the higher elevation. Most of the buildings located at the lower elevation tend to have more facilities located near them such as parks, roads and water bodies compared to those buildings at the higher elevation. However, those buildings at the higher elevation would have a better overview.

The Study area and the target natural features

After extracting Naturals which falls within the Gombak study area through the Selection by Location feature function, I have identified 3 water bodies, 1 forest and 4 parks. The water body, forest and parks are represented by the colors light blue, green and darker pink respectively. All the natural attractions are located away from the center of the study area due to the elevation level.

The study area and digital elevation

The highest elevation points fall in the lower-center parts of the Gombak study area which is 145m above sea level and the lowest elevation points fall in the top, left and right parts of the Gombak study area which is 8m above sea level. Most of the roads, buildings and natural attractions tend to build at a relatively lower elevation level apart from the five buildings which are built at the highest elevation. An important information to take note of is that during the process of creating slope layer, the QGIS system tends to auto-remove one row of pixels away from each side of the Aster_GDEM layer. In order for the slope layer to cover up the entire study area, when extracting clip raster by extent the clipping extent (xmin, xmax, ymin,ymax) has to be adjusted to a slightly bigger scale so that even after creating the slope layer the study area will still falls within the slope layer.

Part Two: A map layout with four views(Proximity)

the study area and Proximity to target roads layer

The distance from land lot to the nearest road is 0m and represented by blacks and furthest distance is 791.281m and represented by the whites. By looking at the color we can determine where is the ideal location to build the quarantine building on the requirement. As mentioned in the above, due to the accessibility factor, we should build the building nearer to the roads hence we should pay more attention to those areas represented by the blacks. Areas in whites are not as accessible because there are either no road or lesser roads as compared to the area in blacks as it is located further away from the roads, which might not be the ideal location to build the quarantine building.

Part Three: A map layout with four view showing the criterion scores of each factor layer

1. Accessibility Factor
2. Health risk Factor
3. Natrual Conversation Factor
4. Economic Factor

Part Four: An Analytical Hierachical input matrix and result report

Part Five: A map layout with the suitability land lot(s)

1. Step 1
2. Step 2
3. Step 3
4. Step 4