Question

visible light satellite image
near - infrared satellite image
select the true statements.
healthy crops may be identified using near - infrared satellite images.
near - infrared satellite images help farmers monitor where crops are growing.
in the near - infrared image, bright green regions represent forests.
fallow fields look green in the visible light satellite image.

Explanation:

• For the first statement: Healthy crops reflect near - infrared light strongly. So, near - infrared satellite images can be used to identify them.
• For the second statement: Near - infrared satellite images can detect the presence of crops (since crops have different spectral reflectance in the near - infrared range compared to non - crop areas like bare soil). So, they help farmers monitor where crops are growing.
• For the third statement: In near - infrared images, bright green (or more accurately, the high - reflectance areas in the near - infrared which are often false - colored as bright green in composite images) regions represent healthy vegetation. Crops (when healthy) and forests both can be in these regions. But the statement is too simplistic as it doesn't account for other healthy vegetation types. However, if we assume a simple classification where forests are a major type of healthy vegetation in the area, and the image is a simple representation, we can consider it.
• For the fourth statement: Fallow fields (which are usually bare soil or have very little vegetation) do not look green in visible - light satellite images. Green in visible light is mainly due to chlorophyll in vegetation.

Answer:

1. Healthy crops may be identified using near - infrared satellite images.
2. Near - infrared satellite images help farmers monitor where crops are growing.
3. In the near - infrared image, bright green regions represent forests.