The question asked to a watcher is: based on the information available, how would they consider the state of the vegetation in a particular group, as compared to the “normal” situation (= what can be expected at this location for this month, in other words the average situation of past years)? Better than usual? Normal? Worse on a scale between 0% and 100%?
“Damage severity” is based on a scale from 0% to 100% that represent the local “damage” as define before. 0% mean that the local situation is better or the same as usual, and 100% that all vegetation is locally inexistant, where it is not supposed to be so at this period of year (for example, the damage severity in a desert is always 0%, as the situation cannot be worst at it is usually). Damage severity can be seen as “the negative part of anomaly”