WRT detection triangulation based off sound is both effective and wide spread. Search for “shot spotter” in use in many cities in a civillian context. For military threat modeling you may be interested in the human intelligence exploitation (HET) teams in afghanistan and itaq. Theyre compound teams pulling in disparate specialists (like sociologists) to study, model, and report on an area. And yes, thats aggregated up through battalion intelligence for tactical use.