Question

In remote sensing, the size of the smallest object recognised by the sensor of the satellite is known as its :

• A. Spectral signature
• B. Spatial resolution
• C. Spectral resolution
• D. Visible spectrum

Answer 1

Answer:

B. Spatial resolution

• In remote sensing, the size of the smallest object recognized by the sensor of a satellite is known as its Spatial Resolution.

• Pixel Size / Ground Sampling Distance (GSD): Spatial resolution is usually expressed in terms of pixel size on the ground (e.g., $10\text{ m} \times 10\text{ m}$).

• A satellite with a spatial resolution of $1\text{ meter}$ can distinguish objects as small as 1 meter across, whereas a satellite with $30\text{-meter}$ resolution will average everything within a $30\text{ m} \times 30\text{ m}$ area into a single pixel.