Discussion
A digital elevation model that records the height of the bare ground, excluding buildings and trees, is properly called
Answer: C
Correct answer: a digital terrain model
The terrain model is the bare earth, with buildings, trees and other surface features removed. The surface model is what the sensor first sees, tops of trees and roofs included. The distinction is critical in use: a flood model or an earthworks calculation needs the terrain model, while a line-of-sight or solar study needs the surface model.
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