Europian Datum 1950 is using in Iran. The height difference from WGS-84 is 30.24 meters.
Therefore, I think it started to decline about 1 km earlier. The distance along the axis of the runway differs by approximately 60 meters (2 arc seconds).
Sorry, the distance along the axis of the runway differs by approximately 30 meters ( abt 1 arc seconds).
Last edited by T28B; 21st Feb 2018 at 02:34.
Reason: added erratum