A comma delimited text file with the flame length probability (FLP) at each node based on the MTT. The FLP file is available in English and metric versions.
The English version has the conditional probability by six categories of Fire Intensity Levels (FIL) which are flame length ranges. Conditional probability is the probability of the flame length occurring given that at least one of the random simulated fires has burned the node.
WARNING: Conditional probability is a complex concept and requires careful interpretation.
The fields of the English file are,
An example may help clarify this concept.
In the above screen shot the first 10 data lines indicate these nodes were not burned, as they have a burn probability (third column) of zero. The 11th line has a burn probability of 0.004000 and a flame length probability of 1.000000 for FIL1. This indicates that all of the random fires that burned this node did so at FIL1 or a flame length < 2 ft.
In this second example the 1st line has a burn probability of 0.032000 and a flame length probability of 0.125000 for FIL1, 0.500000 for FIL2, and 0.375000 for FIL3. No simulated fires burned at FIL 4, 5, or 6. Note that all FIL categories must total 1.000000.
The metric version of the file is similar except it has conditional probability for 20 categories of Fire Intensity Level (FIL) expressed as flame lengths in 0.5 meter categories for FIL1 – FIL19 and FIL20 > 9.5 meters.