Total fire risk
polygon risk wind risk
slope risk ÿ 2 (3)
Two is subtracted from the ranking to scale values
from 1±7 instead of 3±9.
The rating method described in Fig. 2 weights the
importance of polygon, slope, and wind risk equally.
Stand risk factors are only half as important as landscape
risk factors. In a landscape with large polygons,
the importance of neighboring stand attributes to total
risk diminishes. Larger polygons have reduced edgeto-area
ratios, thus increasing the probability of internal
compared to external ignition. Weights of polygon
vs. neighbor risk factors can be adjusted to account for
the size of individual polygons in a landscape. To test
the model's sensitivity to risk factor weights, we
evaluated the scenarios with stand risk factors of equal
importance to landscape risk factors, and stand risk
factors being twice as important as landscape risk
factors.