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Canopy Bulk Density Appears Low: External review has suggested that LANDFIRE canopy bulk density (CBD) estimates are too low.

Background:

Some external review suggests LANDFIRE canopy bulk density estimates are too low for simulating active crown fire. This is difficult to verify given the lack of field-based CBD observations. The matter is further complicated by the myriad of fire behavior processors for which LANDFIRE data are available. Variances in simulated crown fire activity can be observed between the different processors.

Advice:

Both FlamMap 3.0 (Finney 2006) and FARSITE 4.1.052 (Finney 1998) have an embedded switch that enables the user to determine which method of crown fire calculation to use for a potential fire behavior run. Based on many fire behavior simulations using both modes of crown fire calculation, we recommend use of the Scott and Reinhardt "button." This does not mean that the Scott and Reinhardt 2001 switch is "better" or more useful. Rather, it means that use of this button with LANDFIRE data produces more crown fire activity without modifying the CBD layer provided by LANDFIRE.

Conditions vary and data should be evaluated prior to use for fire behavior analyses in new situations.

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