Question

Barren rock will have NDVI of:

• A. \(\text{0.1 or less} \)
• B. \(\text{0.4 or less} \)
• C. \(\text{0.1 or more} \)
• D. \(\text{0.4 or more} \)

Hint:

Barren surfaces such as rocks, deserts, and urban areas have low NDVI values (\(\leq 0.1\)), while healthy vegetation has high NDVI (\(\geq 0.6\)).

Answer 1

The Correct Option is A

Step 1: Understanding NDVI values. - NDVI (Normalized Difference Vegetation Index) is calculated using red and near-infrared (NIR) reflectance: 

 

\[NDVI = \frac{(NIR - Red)}{(NIR + Red)}\]

- NDVI values range from -1 to +1: - Dense vegetation: \( 0.6 - 1.0 \) - Sparse vegetation: \( 0.2 - 0.5 \) - Barren surfaces (rocks, sand, urban areas): \( 0.1 \) or less - Water bodies: Negative values 
Step 2: Explanation of incorrect options. - 0.4 or less b.: Includes areas with sparse vegetation. - 0.1 or more c.: Includes vegetation, which is incorrect for barren rock. - 0.4 or more d.: Represents healthy vegetation, not barren land. 
Step 3: Selecting the correct option. Since barren rock has an NDVI of 0.1 or less, the correct answer is a. 0.1 or less.