Methods

The following macro modeler depicts the creation of three factors that will be used in the final analysis: (i) exposure, (ii) ocean_dist, and (iii) floodplain.

Exposure to the dominant wind direction with low values equating to a high exposure.

Distance from the ocean in meters

Fraser River floodplane as defined by a cost analysis in meaningless units


Temperature, precipitation, and snowfall factors were converted from point data to being representative of the whole region by using linear regression equations. These equations were created based on there conditions that were elevation, distance from the ocean, and distance from the mountains (defined as any area over 1000m). Elevations are given in the gvrd_dem, distance from the ocean was created above, and distance from the mountains was created using the following steps.

The location of each weather station was then overlayed on each of the conditions to obtain values using the curser inquiry mode. Elevation values were previously obtained from the Enviornment Canada website.

Distance from ocean with weather stations


Distance from mountains with weather stations

 

Using the 'multireg' and 'image calculator' features in Idrisi, the following equations and images were then produced

Temperature





Precipitation





Snow



ID
Elevation (m)
Location
Distance from ocean (m)
Distance from mountains (m)
1
365.8
SFU
997
9403
2
50
Cloverdale
21395
26286
3
2.4
Tsawwassen
218
218
4
76
Fort Langley
41966
15335
5
147
Haney
19362
7599
6
1127.8
Grouse mtn
6219
510
7
182.9
N.Vancouver
5118
2131
8
5
Pitt Meadows
13226
14131
9
129.5
Port Moody
1274
7972
10
0
Sandheads
0
30563
11
4.3
YVR
1860
20164
12
168
W.Vancouver
1505
3537
13
13
White Rock
21675
35501

 

 

next page