Positions stats


#1

For fun (heatmaps) I’ve started logging all the positions dump1090 picks up by dumping all the output from port 30003 (the SBS port). Since I started logging about 14 hours ago, I’ve picked up 284560 locations, all of which are unique (no lat/long pair is ever repeated). Meanwhile, FlightAware is reporting averages of ~80k positions reported a day.

Oh and I should mention that MLAT forwarding isn’t enabled on my dump1090 instance, the positions I’m looking at should be positions from my receiver alone.

I’m just curious, why isn’t FlightAware using all the positions I’m reporting?


#2

piaware aggregates positions before forwarding to FA; there is not a 1:1 correspondence between ADS-B position messages and Flightaware’s position stats. So they are different because you are counting different things.

(see github.com/mutability/dump1090/ … io.c#L1549)