Question

What is meant by the term 'spatial filtering' in remote sensing?

• A. \( \text{Changing the position of pixels in an image because of inconsistencies in the relationship between sensor and surface during data collection} \)
• B. \( \text{Making parts of the image at a different scale to another part of the image} \)
• C. \( \text{Separating a scene into separate constituent parts and focusing on a smaller section to increase the resolution} \)
• D. \( \text{Selectively preserving certain pixel frequencies in an image to enhance particular features or edges of objects} \)

Hint:

Think of spatial filtering as smoothing or sharpening an image by considering the spatial arrangement of pixels.

Answer 1

The Correct Option is D

Spatial filtering in remote sensing involves applying a kernel (a moving window) over the image to modify pixel values based on the values of their neighbors. This technique selectively preserves or suppresses certain spatial frequencies in the image, which can enhance particular features like edges or reduce noise.