Spatial Analysis
3.1 MCE Boolean Intersection
3.2 MCE Weighted Linear Combination
3.3 Results
Spatial Analysis
3.1 MCE Boolean Intersection
3.2 MCE Weighted Linear Combination
3.3 Results
3.2 Weighted Linear Combination
For my MCE Weighted Linear Combination, I chose 3 constraints and 6 factors to help in the decision of where the site should go. To see a larger version of any of the small images, simply click on the image you wish to enlarge. Also, to view the cartographic model of the WLC, click here.
Constraints:
1. Water:
Although there is a fuzzy factor relating to distance from water, I decided to make a constraint of 200 meters away from water. The best location would be adjacent to the water so that the pump would not have to go quite so far. I decided that anything further than 200m would be just a little bit too far for pumping water (especially at low tide).
This buffer was done by initially reclassifying the city.rst to isolate the water and land. Then a buffer of 200m was put around the water.
2. People:
As this is a quarantined site, you would not want to locate it near where people (and their pets!) live. Although the chances of someone contracting anything from these seals is extremely small, there is a larger chance that the seals could contract something from us. This is partially why the site's location is not told to the general public and one of the most important rule at the site is for cleanliness (constantly have to clean and disinfect everything!)
I decided to put a 50 meter buffer around areas where people live. This was done using the people.rst on "Areas Where Nobody Lives"
3. Landuse:
Although I do already have a constraint with a 50m buffer around areas where nobody lives, I also have a constraint on the type of landuse that the Rehabilitation site could be on. This includes open space/undeveloped, industrial, and transport/communications. Normally, I would not have included transport/communications but the Port of Vancouver and the existing Rehabilitation site is on this land type.
This was accomplished by assigning all land that was usable as 1 and everything else as 0.
Factors:
1. Slope:
Because of everything that is on the site, having a flat surface is necessary. I decided on having a slope of less than 5% as being ideal. Since this is a factor and not a constraint, it is possible to locate the Rehabilitation Site on areas with a greater slope (would just involve a lot more leveling of the area)
Using a DEM of a large part of the Lower Mainland and part of the Gulf Islands, I calculated out the slope into percent and reprojected it to fit the other images. I also overlayed it with where land is on the Lower Mainland so that it was easier to visually see the slope.
Weight: 0.3389
2. Landuse:
Although there is a constraint on landuse using the same types of land (undeveloped, industrial, and transportation/communication), they are not all equally ideal. Ideally, the site would be placed on undeveloped (=255), then industrial (=175), followed by transportation/communication (=100).
Weight: 0.2899
3. Water:
A fuzzy sigmoidal curve was applied to water to have the best location adjacent to the water's edge and decreasing until it reached the constraint of 200 meters.
Weight: 0.1763
4. Roads:
As having access to roads (to transport seals) is important, having the site too far away from the road is not the best situation. A Fuzzy J-Curve was used, with control points at 50m and 200m.
Weight: 0.1301
5. Aquarium:
The closer the to the aquarium the site is, the better it would be. Although this isn't a necessity, a Fuzzy J-Curve was used, having control points at 0 and 25000.
Weight: 0.0225
6. Bus Routes:
This really isn't an important factor but since I (as well as other people) do take the bus to get there, thought I should put it in. I used data obtained from Translink and decided that 500 meters would be appropriate. I would have had a larger area but at the current site, there is a bus stop roughly 300m but with detours such as buildings and railways, thought a maximum should be 500m.
Weight: 0.0122
Results of MCE WLC
With the MCE Weighted Linear Evaluation, the results (shown above) were very widespread. Since there were so many results, I decided to do an overlay and rule out any cities that were not ideal. I kept Vancouver, North Vancouver, West Vancouver, Richmond, Burnaby, New Westminster, and UBC. After that, I grouped the areas and found out their area in square meters. Below, you can see the results from that.
By visually looking at this, you can still rule out any locations along the Fraser River as it is fresh water, not salt water. With that, the aquarium should focus its attention around False Creek, and industrial areas along Burrard Inlet.
