Crown fraction burned
n. A mathematical function for scaling rate of spread between that of a surface fire and that of an active crown fire.
The concept of using a mathematical function to scale rate of spread between predictions for surface fire and active crown fire was developed by Van Wagner (1993). This crown fraction burned concept is used in the Canadian Forest Fire Behavior Prediction System, and the fire behavior models FARSITE, FlamMap, and NEXUS. Crown fraction burned is a dimensionless number between 0 and 1.