LANDFIRE's (LF) Forest Canopy Bulk Density (CBD) describes the density of available canopy fuel in a stand. It is defined as the mass of available canopy fuel per canopy volume unit. CBD unit measurements are kg m-3 * 100. These products are provided for forested areas only.
Annual Disturbance products were incorporated into CBD during LF 2008 production. The introduction of this information allowed for informed changes to the assigned CBD from disturbance type, severity, and time since the disturbance.
LF Remap incorporates Fuel Vegetation Type, Canopy Cover and Canopy Height in place of Existing Vegetation Type, Existing Vegetation Cover, and Existing Vegetation Height for CBD assignment. The fuel vegetation data are pre-disturbance at disturbance locations and existing vegetation at non-disturbance locations. The pre-disturbance scenario is represented by the vegetation that existed before the event occurred. The combination of pre-disturbance and non-disturbance vegetation used to calculate CBD by informing how much or little and what type of fuels are natural or acted on by a disturbance event. A general linear model (Reeves et al, 2009), derived from fuelcalc plots, is used for these calculations.
LF Remap CBD has "capable fuels" functionality, meaning CBD is assigned using FDist capable fuels.
CBD supplies information for fire behavior models, such as FARSITE, to determine the initiation and spread characteristics of crown fires across landscapes.