Operational factors applied to obstacle clearance altitudes to produce the safest usable altitude.
The geometry of surfaces that define altitude levels and the structure of an area used to evaluate obstacles for determining holding patterns.
The geometry of surfaces used to define the altitude the length of a segment, holding pattern, etc., in function of the obstructions located in the area.
Provides the location relative to
[FAA 8260.3] The highest airspace, obstacle or terrain relative to a prescribed plane within a specified area.