Highly recommend the “Advisory Circular Project”[1]. It takes ADS-B data grabbed from a network of 3000 pi+gnu radios [2], analyzes them for aircraft flying in circles(!), and tweets out the images[3].
This is better than FlightAware as you are getting raw unfiltered ADS-B/Mode S/MLAT location data broadcast from the aircraft and aren’t filtering out position only flights.
This is really cool. Pretty remarkable how a relatively simple heuristic captures the behavior so effectively.
Also, take a look at the timestamps for the most recent tweets from @skycirclesla.
Would be cool if the adsbexchange project added some audio fingerprinting and even skyward-facing cameras to start detecting and even identifying aircraft that don’t sqwawk/squit/etc.
This is better than FlightAware as you are getting raw unfiltered ADS-B/Mode S/MLAT location data broadcast from the aircraft and aren’t filtering out position only flights.
Here is an instance of the California Highway Patrol observation plane circling downtown Oakland last night for some reason: https://twitter.com/skycirclessf/status/1268408145224720384?...
[1] https://gitlab.com/jjwiseman/advisory-circular/
[2] https://www.adsbexchange.com/
[3] https://twitter.com/skycirclesdc/status/1268332759358947328?...