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The Forest Canopy Base Height (CBH) layer 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 a sufficient amount of forest canopy fuel to propagate fire vertically into the canopy. These data are provided for forested areas only. CBH unit measurements are meters * 10.
CBH is generated using a predictive modeling approach that relates Landsat imagery and spatially explicit biophysical gradients to calculated values of CBH from field training sites.
CBH provides information for fire behavior models to determine areas in which a surface fire is likely to transition to a crown fire.