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Re:Hyundai and Uber Unveil Autonomous Pods, EVTOL Aircraft, ... by toomuchtodo on Saturday January 18, 2020 @11:55AM (#22085426)
Reports both geometric and barometric/pressure altitudes. You can work back to AGL from geometric and GPS coordinates.

https://www.faa.gov/nextgen/programs/adsb/faq/#g7

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