Dump1090
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gvanem
Plane Jumping around on the map?
now, im not sure if this is a fixable bug, or really what is going on here, but planes seem to jumping between the base station and specific points on the map, as shown below. I have no idea what's causing this to happen, but it is very... odd, and not very random either.
post script note: the longer I leave it running, the more planes accumulate in those and other areas, eventually forming a grid, pictured below.
I see the same myself. It's some issue with the CPR (Compact Position Reporting) algorithm used for message-type 17
and sub-types [9..18+20,21,22]. Probably some math-rounding error in decode_CPR() or a wrong usage of this function.
I grabbed it from the Mictronics repo long time ago.
So I should be improved to use this version which I fail to understand fully. The condition for a mm->cpr_even_valid etc.
eventually forming a grid, pictured below.
I fail to parse this "grid". Your location is not shown on the map. But I assume it's in Oklahoma?
I do not get this clustering effect. I see jumps like this just now:
when clicking on the WIF453 plane to show the tracks. Seems correct initially, but then the plane jump way up North and back to the correct position. A zoomed-up version 10 min. later:
Related to your issue?
possibly, but the issues happen even without tracks shown or planes selected. I don't know anything about this, I just know that when i ran it with persist on and left it going overnight, I got the results in the second image.