MLAT - how can i see where Altitude numbers come from


#1

i’m still wondering if/how/where i can see where the altitude data came from those three possible:

  • from aircraft transmitted
  • from aircraft transmitted and corrected by mlat computing
  • only based on mlat computing

in aircraft.json i find different behavior in field mlat:

  • lat lon altitude track speed vert_rate
  • lat lon track speed vert_rate

is this the right place and if so single place where one can find the answer of my question?
what exactly do the two behaviors stand for?

thanks
tom


#2

You could look at the raw beast messages to distinguish these cases. Mlat messages are easily recognized by their timestamps.


#3

yes - thanks for the reminder i again forgot about the mlat-timestamps! but it were nice if you could explain me why and when you set those parameters (lat lon altitude track speed vert_rate ) into mlat-field and what that means. when i have to do this and in addition dive through the code behind it would probably cost me hours :slight_smile:


#4

The code is the definitive reference here, I think you’ll just have to spend the time to understand it.


#5

ok - when i have to - i will :slight_smile: but one thing is sure - if there were a user ranking for dump1090/mlat-client/piaware code diving i’d be the number one at least if parameter were the time spent …