Statement : Normalized Difference Vegetation index (NDVI) is computed from difference between visible and near-infrared (NIR) reflectance.
Conclusions:
I. Vegetation strongly reflects in visible band and absorbs NIR radiation
II. In standard false colour composite red colour is assigned to NIR band and other colours to visible bands
1. Only I is true
2. Only II is true
3. Both I and II are true
4, Both I and II are false
Both I and II are true
Explanation:
I. Vegetation strongly reflects in the visible band (usually red) and absorbs NIR (near-infrared) radiation. This is a fundamental principle behind the computation of the Normalized Difference Vegetation Index (NDVI). NDVI is calculated by taking the difference between the NIR and visible band reflectance and then dividing it by the sum of the NIR and visible band reflectance. High NDVI values indicate healthier and more abundant vegetation, while low NDVI values correspond to non-vegetated or less healthy areas.
II. In a standard false-color composite, the red color is assigned to the NIR band, and other colors (e.g., green and blue) are assigned to the visible bands. This type of composite is often used in remote sensing applications to highlight vegetation in a way that makes it visually distinguishable from other features on the Earth's surface. Assigning NIR to the red channel enhances the contrast between vegetation and non-vegetated areas, as healthy vegetation appears bright red.
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