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Forum: Tech Log

9th Mar 2016, 16:19

Replies: 14

Geopotential or geometric feet?

Views: 4,881

Posted By seriewoordenaar

Barometrics

So, if I understand correctly, the QNH corrected altitudes set in the onboard altimeter are NOT reported in ADS-B and are applied on the data by the ground station?
This could explain why sometimes...

Forum: Tech Log

9th Mar 2016, 11:11

Replies: 14

Geopotential or geometric feet?

Views: 4,881

Posted By seriewoordenaar

Barometric geopotential altitudes

To put it all together and conclude from what I've read on forums and found in references:
ADS-B definitely reports barometric altitudes that are most likely expressed in geopotential feet.
To...

Forum: Tech Log

8th Mar 2016, 09:28

Replies: 14

Geopotential or geometric feet?

Views: 4,881

Posted By seriewoordenaar

Thanks for the reference! It basically confirms...

Thanks for the reference!
It basically confirms what I already knew : ADS-B CAN transmit both barometric and geometric altitude, but only barometric is important (standard) for ATC.
If it is...

Forum: Tech Log

7th Mar 2016, 21:07

Replies: 14

Geopotential or geometric feet?

Views: 4,881

Posted By seriewoordenaar

Geopotential or geometric feet?

I know what ellipsoidal heights and the geoid mean - that's what is used when calculating the orthometric altitude.

The question remains : what units are barometric altitudes (flight levels)...

Forum: Tech Log

7th Mar 2016, 18:26

Replies: 14

Geopotential or geometric feet?

Views: 4,881

Posted By seriewoordenaar

Geopotential or geometric feet?

For a project I need to calculate the orthometric altitudes of flying aircraft.
Flight altitudes above the Transition Altitude and Transition Level as reported by ADS-B (in Plane Plotter logs) are...

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