Keywords: GPS altitude, RTK altitude
Both GPS altitude and RTK altitude can output the current ellipsoid height of the drone. The difference is that the RTK altitude origin depends on the user's choice of the rtk coordinate system (C2000, WGS84, or custom), while the GPS altitude origin is only in the WGS84 coordinate system.
GPS is limited by positioning accuracy. Generally, the short-term error of the altitude is relatively large, but it is basically reliable in the long-term.
In the case of fix, RTK has high positioning accuracy and is very reliable in the short and long term (under the fix condition).
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