Burn severity run immediately post-fire may not capture the true impact on vegetation; heat damage to vegetation (i.e. needle drop) may not be fully realized until a full growing season has passed, and so this classification may over- or under-estimate some burn severity categories, particularly in areas of dense canopy cover where the ground may not be visible in the post-fire satellite imagery.
Early season fires may be fully classed as unburned due to a combination of lower fire intensity and rapid vegetation green-up in the spring.
Default breakpoint values (based on research by the US Forest Service) are used for all fires across the province, regardless of fuel/timber types:
0-75 = unburned
76-109 = low
110-187 = medium/moderate
188-255 = high