Overview
The Standard Datum Plane (SDP) is the theoretical level in the atmosphere where the weight of the atmosphere is 29.92” Hg as measured by a barometer. The SDP is used to determine pressure altitude.
The Standard Datum Plane (SDP) is the theoretical level in the atmosphere where the weight of the atmosphere is 29.92” Hg as measured by a barometer. The SDP is used to determine pressure altitude.