Above what reference point is the Kármán line altitude of 100 kilometers measured?
Answer
Mean sea level
The measurement basis for the Kármán line altitude is explicitly defined as being above mean sea level. This choice is crucial for standardization because it ensures that the 100-kilometer measurement remains consistent globally, regardless of local topographical variations. Whether a vehicle ascends from a high mountain range or from the ocean surface, the reference point for determining whether the Kármán line has been crossed is the standardized measure of mean sea level, which removes fluctuations caused by physical geography.
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Scientific and Technical Aspects of the Karman Line - YouTube
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