Seems quite a move forward, basically triangulation from smartphone microphones. Examples and maps at the link. Has been released as open source code for testing.
Carnegie Mellon System Locates Shooters Using Smartphone Videos
Carnegie Mellon University By Byron Spice
Researchers at Carnegie Mellon University (CMU) have developed a system that can accurately locate a shooter based on video recordings from as few as three smartphones. The researchers tested the Video Event Reconstruction and Analysis (VERA) system using three video recordings from the 2017 mass shooting in Las Vegas that left 58 people dead and hundreds wounded; it correctly estimated the shooter's actual location. The system uses machine learning to match up video feeds and calculate the position of each camera based on what it is seeing; it also tracks the time delay between the sound of a shock wave caused by a bullet’s passage through the air, and the sound of the muzzle blast from the gun. Using video from three or more smartphones allows the direction from which the shots were fired to be triangulated. Said CMU’s Alexander Hauptmann, "When we began, we didn't think you could detect the crack with a smartphone because it's really short, but it turns out today's cellphone microphones are pretty good." ... "
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