Definition
The height of the ground surface at a given location, measured in feet above mean sea level (MSL).
Plain English
How high the actual ground is at a particular spot, measured from sea level.
Context Anchor
Seen when reading aviation charts, planning a route, crossing hills or mountains, and judging how much room exists between the airplane and the ground.
Derivation
From Latin elevare, 'to lift up.' Terrain elevation is literally how far the ground has been 'lifted' above sea level at a given point.
Why Pilots Care
Knowing terrain elevation lets pilots choose safe altitudes and avoid controlled flight into terrain, especially in low visibility or mountainous areas.
Intuition Check
Terrain elevation is not the airplane’s height above the ground. It is the height of the ground itself, usually measured from sea level.
Example Sentence 1
Before the flight, the pilot noted that the highest terrain elevation along the route was 4,200 feet MSL.
Example Sentence 2
High terrain elevation forced the crew to select a higher cruising altitude to maintain safe clearance.