Which is an advantage of using NDVI in land-use monitoring?

• A. It indicates vegetation vigor and cover and supports rapid monitoring.
• B. It measures soil moisture directly.
• C. It is unaffected by atmospheric interference.
• D. NDVI saturates in dense canopies.

Answer: (A)

NDVI captures vegetation vigor and canopy cover from orbiting sensors, and this makes it a powerful tool for land-use monitoring. By comparing how much red light vegetation absorbs with how much near-infrared light it reflects, NDVI assigns higher values to healthy, dense green vegetation and lower values to sparse vegetation or non-vegetated surfaces. This relationship provides a quick, scalable way to monitor changes in vegetation amount and health across large landscapes over time, which is exactly what land-use monitoring requires.

The other statements describe things NDVI does not directly measure or describe limitations rather than advantages: soil moisture is not measured directly by NDVI, atmospheric effects can influence the readings and require correction, and NDVI tends to saturate in very dense canopies—limiting its ability to distinguish among the most vigorous vegetation.