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Why does ADS-B altitude from multiple landed planes vary so much from one plane to another?

The aircraft do not send out altitude when they are on the ground. On the ground, aircraft send out the surface messages, which combine position, speed and heading. The airborne message formats ...
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Is it appropriate to determine approximate flight altitudes based on ADS-B landed altitude compared to runway elevation?

For an after-the-fact analysis, for example looking at flight data recorded by an EFB or displayed on a flight-tracking website, what you describe sounds very reasonable. For use during a flight this ...
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What is the relation between ADS-B MOPS & quality indicators?

The MOPS stands for Minimum Operational Performance Standard. It is a document that describes exactly how the transponder should create and transmit ADS-B messages. The document is maintained by ...
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