Question

For a push-broom sensor, the following details are given:
Number of detectors = 3000
Height above the ground = 900 km
Swath on the ground = 30 km
The spatial resolution of the sensor is _____ m.

• A. 30
• B. 270
• C. 3
• D. 10

Hint:

For push-broom scanners, spatial resolution $\approx \dfrac{\text{swath}}{\text{number of detectors}}$. Height affects IFOV design but not the simple swath/array GSD relation when swath is already specified.

Answer 1

The Correct Option is D

Idea: In a push-broom sensor, one line on the ground is imaged at a time by an array of $N$ detectors. The ground-projected width (GSD) per detector equals total swath divided by the number of detectors.
Compute spatial resolution (GSD).
Swath $=30~\text{km}=30{,}000~\text{m}$, $N=3000$.
\[ \text{GSD}=\frac{30{,}000~\text{m}}{3000}=10~\text{m}. \] \[ \boxed{10~\text{m}} \]