I provide feeds locally, to FlightAware, and ADSB Exchange.
Yesterday, I was watching an aircraft doing touch and goes. The tracks shown on my local dump1090-fa feed are slightly different than the racks shown on the flight history shown here: – https://flight-data.adsbexchange.com/map?icao=AD4643&date=2019-03-19
The tracks on my local feed are rounded where as those shown on the ADSB-Exchange history are straight lines from point to point.
So, what is going on? Does dump1090-fa interpolate the curves between those dots or do those dots on the history page represent only a few of the data points that dump1090-fa uses to draw the paths taken by an aircraft?
Thanks for any insight provided.