FAQ

What is the Geopotential altitude?
Geopotential altitude is the geometric altitude corrected for the gravity variation. Geopotential altitude is usually measured using the Meter for Length. Note that the value of Geopotential altitude is always positive.
Can the Geopotential altitude be negative?
No, the Geopotential altitude, measured in Length cannot be negative.
What unit is used to measure Geopotential altitude?
Geopotential altitude is usually measured using the Meter[m] for Length. Millimeter[m], Kilometer[m], Decimeter[m] are the few other units in which Geopotential altitude can be measured.
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