Coolest and scariest thing I've seen in a while

I had no idea that Doppler waves would show up like this, but it makes sense they do. I would assume the three letter agencies have been using this forever, but it feels like this unlocks a lot of crazy use cases for both commercial and private sectors?

Also.. I think this might be the coolest thing I've ever seen on YouTube.

This is extremely cool to the point where I feel dangerous even knowing that the option to do this exists.