Question

The minimum spatial resolution offered by SRTM Digital Elevation Model is:

• A. 0.5 arc second
• B. 1 arc second
• C. 2 arc second
• D. 3 arc second

Hint:

Remember: \[ \boxed{ \begin{aligned} 1\ \text{arc second} &\approx 30\ \text{m} 3\ \text{arc second} &\approx 90\ \text{m} \end{aligned} } \] Smaller arc-second value means finer spatial resolution.

Answer 1

The Correct Option is B

Concept: The Shuttle Radar Topography Mission (SRTM) generated Digital Elevation Models (DEMs) of the Earth's surface. The finest (highest) spatial resolution publicly available for SRTM data is \[ \boxed{1\ \text{arc second}} \] which corresponds to approximately \[ 30\ \text{m} \] ground resolution.

Step 1: Recall SRTM resolutions. \[ \boxed{ \begin{aligned} 1\ \text{arc second} &\approx 30\ \text{m}\\ 3\ \text{arc second} &\approx 90\ \text{m} \end{aligned} } \]

Step 2: Identify the minimum (finest) spatial resolution. Since \[ 1\ \text{arc second} < 3\ \text{arc second}, \] the minimum spatial resolution offered by SRTM is \[ \boxed{1\ \text{arc second}.} \] Therefore, the correct option is \[ \boxed{(B).} \]