Question

Which of the following is NOT a derivative of Digital Elevation Model (DEM)?

• A. \( \text{Slope} \)
• B. \( \text{Aspect} \)
• C. \( \text{Contour} \)
• D. \( \text{Emissivity} \)

Hint:

Think of DEM derivatives as features derived from elevation values. Emissivity relates to heat emission, not elevation geometry.

Answer 1

The Correct Option is D

Slope, aspect, and contour are all common derivatives of a Digital Elevation Model (DEM). \begin{itemize} \item Slope represents the rate of change of elevation. \item Aspect represents the direction of the steepest descent. \item Contours are lines connecting points of equal elevation. \end{itemize} Emissivity is the measure of an object's ability to emit thermal radiation and is not directly derived from the geometric information contained in a DEM. It is a surface property related to thermal characteristics.