Question

To visually distinguish between a river channel and a canal on an image, having similar widths and located in the same area, the most important parameter used is _____

• A. \( \text{Size} \)
• B. \( \text{Shape} \)
• C. \( \text{Tone} \)
• D. \( \text{Texture} \)

Hint:

Consider how natural water bodies (rivers) meander and branch compared to the engineered straightness of canals.

Answer 1

The Correct Option is B

When river channels and canals have similar widths and are in the same area, their shape is often the most important parameter for visual distinction on an image. Rivers tend to have more sinuous, irregular, and natural shapes with varying curves and branching patterns. Canals, on the other hand, are typically straighter, more geometric, and may have sharp, engineered bends. While tone and texture might offer some clues, the overall planimetric shape is usually the most diagnostic characteristic.