LANDFIRE's (LF) Forest Canopy Base Height (CBH) describes the average height from the ground to a forest stand's canopy bottom. Specifically, it is the lowest height in a stand at which there is enough forest canopy fuel to propagate fire vertically into the canopy. CBH unit measurements are meters * 10. These products are provided for forested areas only.
Annual Disturbance products were first incorporated into CBH during LF 2008 production. The introduction of this information allowed for informed changes to the assigned CBH from disturbance type, severity, and time since the disturbance.
LF Remap incorporates Fuel Vegetation Type, Canopy Cover (CC) and Canopy Height in place of Existing Vegetation Type, Existing Vegetation Cover, and Existing Vegetation Height for CBH 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 are used to calculate CBH by informing how much or little and what type of fuels are natural or acted on by a disturbance event. Linear equations for these calculations are derived from Forest Vegetation Simulator scenario outputs.
CBH provides information for fire behavior models to determine areas in which a surface fire is likely to transition to a crown fire.
LF Remap CBH has "capable fuels" functionality, meaning CBH is assigned using FDistcapable fuels.