The paper shows how to add altitude to the adaptive enhanced cell identity (AECID) fingerprinting localization method in the long term evolution (LTE) cellular system. This improves the precision of E- 911 emergency positioning in vertically extended regions like in tall buildings. The altitude is added to the corners of a polygon using assisted GPS (A-GPS), observed time difference of arrival (OTDOA) or uplink time difference of arrival (U-TDOA) altitude measurements of opportunity. A new algorithm transforms to a 3-dimensional point with an ellipsoidal uncertainty, since the latter format is standardized on all LTE position reporting interfaces.