A brief NIR drone video of a forest fire vulnerable site in the southern Coa Valley in Portugal. We were examining this site to create full 3D orthomosaic maps of the region which has been changed by seasonal forest fires, which have gained in intensity over the past few years. Most of the remains of trees here are from an older forest fire in 2017 but some are more recent.
Mapping the location of the most effected areas and relating the areas of dried vegetation to the topology of the region is essential in understanding the physics of forest fires and relating the theory to the evidence in evaluating the path the fire follows.
An important rule of thumb is that fires will travel through the path of least resistance but they will also consume the most fuel in areas with a slope as the upward air helps dry out the vegetation and captures more of the flame than on a flat surface, hence a fire will typically double in speed for every 10 degree angle of slope in a region.