Question

Which factor primarily controls reflectance in the SWIR region of vegetation?

• A. Chlorophyll concentration
• B. Leaf orientation
• C. Water content in leaf tissue
• D. Leaf thickness

Hint:

Vegetation spectral regions: \[ \boxed{ \begin{aligned} \text{Visible} &\rightarrow \text{Chlorophyll} \text{NIR} &\rightarrow \text{Leaf structure} \text{SWIR} &\rightarrow \text{Leaf water content} \end{aligned} } \]

Answer 1

The Correct Option is C

Concept: In the Short-Wave Infrared (SWIR) region, vegetation reflectance is mainly influenced by the amount of water present in plant leaves.

Step 1: Understand vegetation reflectance.
• Visible region $\rightarrow$ Controlled by chlorophyll.
• Near Infrared (NIR) $\rightarrow$ Controlled by leaf structure.
• SWIR $\rightarrow$ Controlled mainly by water content.

Step 2: Identify the controlling factor. Hence, \[ \boxed{\text{Water content in leaf tissue controls SWIR reflectance}.} \] Therefore, the correct option is \[ \boxed{(C).} \]