Aspect

Graphs for Entire MLFD
These consist of three data sets:
The single graph represents the conditions over the entire MLFD.
The Pine data set identifies the percentage of pine in a given area and the Susceptibility data set identifies how susceptible the pine areas are to MPB infestation as predicted by the Shore and Safranyik susceptibility model. These data sets represent conditions in 1995.

All data sets are at a spacial resolution of 200m.

Table 1
entire MLFD asp In general, south facing slopes around 160º to 180º are slightly more prevalent in the MLFD.  Slight peaks also exist in the south west west (225º-275º) and north north east (25º-75º) directions.

Pine coverage and MPB infestation susceptibility are most prevalent on south facing slopes between 160º to 180º as well as south west west facing slopes between 225º to 275º.  A less pronounced peak also exists in the north north east direction (25-75), however, this trend diminishes as pine cover and susceptibility increases. 

The trends observed for the MLFD as a hole are more pronounced in pine covered areas, especially for the south and south west west facing slopes.
suscep aspect
pine aspect




Graphs for MPB Infested Areas
Table 1
New infestation for each Year:
 Summary of Observations:
Figure 1
new-asp
The New infestation graphs (fig. 1) show a consistent preference for south facing slopes between 160º and 180º with a drop around 225º to 275º. This indicates that new beetle spread is strongest up south facing slopes.  Although part of this trend can be attributed to the prevalence of south facing slopes in the MLFD, and the higher concentration of pine on these slopes, the through in the south west west direction indicates that that MPB spread patterns are controlled by additional factors.

A less pronounced peak around 25º to 75º is also apparent for most years. Although this peak is also present in the overview graphs (table 1), it is more pronounced in the new infestation graphs (fig1).


The cumulative MPB spread patterns (fig. 2)
Total (cumulative) infestation for each year:
Figure 2
all-0		 Figure 3
all-25
Figure 4
all-50
 Figure 5
all-75-2002
all-75-2003
(Other years have very low or 0 n values.  This is an indication of the increased severity as infestation progresses indicating that infestation ates were at their peak in 2002.)