Discussion
Consider the following statements about elevation data.
1. A digital surface model includes vegetation and buildings.
2. LiDAR can record more than one return from a single pulse.
3. Contours drawn from a digital model are more accurate than the model.
Answer: B
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: the surface model includes vegetation and buildings, and a LiDAR pulse spreading over a footprint can return from a canopy and again from the ground beneath, which is exactly how the bare earth is extracted. Statement 3 is impossible - contours derived from a model inherit its errors and add interpolation of their own, so they can never be better than the data they came from.
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