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I have two wind data sets that I want to compare:

  • a) Aircraft derived data (ADS-B and Mode-S).
  • b) ERA5 Reanalysis data. To compare both I need altitudes to be comparable. On data set a) I have the geometric height. Precisely, it corresponds to Data Item from I021/140 from ICAO document Part 12: Category 021, as seen in the following image:

enter image description here

On the other hand, data set b) is given in "pressure levels". What I did is to transform this pressure level on b) to altitude using the ISA model. Then I supposed I can compare this altitude with the geometric height given on a). But I am not sure if it's correct to do so. I don't know if the pressure level on ERA5 is just a way to indicate altitudes or not.

Is it correct? If not, is there any way to compare them?

Doc.:

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  • $\begingroup$ Related What is the geoid undulation used for in aviation? I think you need to add the geoid undulation N to the altitude obtained from the ISA model, to get the ellipsoidal height comparable with ADS-B data. Still you'll be comparing a barometric altitude (not an actual altitude) with a GPS altitude. $\endgroup$
    – mins
    Oct 12 at 23:33

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