Question

If the height of features like buildings and trees are subtracted from the digital surface model, then the result is known as:

• A. \(\text{Digital Exterior Model} \)
• B. \(\text{Digital Interior Model} \)
• C. \(\text{Digital Height Model} \)
• D. \(\text{Digital Elevation Model} \)

Hint:

A Digital Elevation Model (DEM) represents the bare earth, derived by removing buildings and vegetation from a Digital Surface Model (DSM).

Answer 1

The Correct Option is D

Step 1: Understanding Digital Elevation Models (DEM). - Digital Surface Model (DSM) includes the height of terrain plus objects like buildings and trees. - Digital Elevation Model (DEM) represents the bare earth terrain with all surface objects removed. 
Step 2: Subtraction of features.  \(\text{DEM} \) = \(\text{DSM} \) - \(\text{Height of Objects (Buildings, Trees)} \)  This removes surface objects, leaving only the natural terrain. 
Step 3: Explanation of other terms. 
- Digital Exterior Model: Not a standard term in remote sensing. 
- Digital Interior Model: Unrelated to elevation mapping. 
- Digital Height Model: Not a widely used term in topographic mapping. 
Step 4: Selecting the correct option. Since a DEM results from subtracting surface features from a DSM, the correct answer is d. Digital Elevation Model.