The official PERSON@1 scale category is determined by meteorologists -LRB- and engineers -RRB- after a ground and/or aerial damage survey ; and depending on the circumstances , ground-swirl patterns -LRB- cycloidal marks -RRB- , radar tracking , eyewitness testimonies , media reports and damage imagery , as well as photogrammetry/videogrammetry if motion picture recording is available .

The official PERSON@1 scale category is determined by meteorologists -LRB- and engineers -RRB- after a ground and/or aerial damage inspection ; also including analysis of available sources such as eyewitness accounts and damage images and/or videos .
