Touchdown zone elevation (TDZE)
Unfactored or Certified Landing Distance
Viscous Hydroplaning ...
Touchdown zone elevation (TDZE). The highest elevation in the first 3,000 feet of the landing surface, TDZE is indicated on the instrument approach procedure chart when straight-in landing minimums are authorized.
TouchDown Zone Elevation - The highest centerline elevation in the touchdown zone which is the first 3000’ of a runway or the first third of a runway, whichever is less, measured from the threshold in the direction of landing.
TERPS ...
Do not use TDZE (Touchdown zone elevation)
Over 90% of missed approach accidents occur on the second missed.
ATC cannot give a visual approach when visibility is less than three miles.
the end of the ILS runway, transmitting a radiation pattern keyed at six dots per second and indicating to the pilot, both aurally and visually, that he is at the designated decision height (DH), normally 100 feet above the touchdown zone elevation, ...
 See also: Beacon, Direct, Obstruction, Climb, Air traffic
  
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