North east down

North east down
The east north up (ENU) local tangent plane is similar to NED, except for swapping 'down' for 'up'

North east down (NED), also known as local tangent plane (LTP), is a geographical coordinate system for representing state vectors that is commonly used in aviation. It consists of three numbers: one represents the position along the northern axis, one along the eastern axis, and one represents vertical position. Down is chosen as opposed to up in order to comply with the right-hand rule. The origin of this coordinate system is usually chosen to be the aircraft's center of gravity.

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