GATE 2025 AR — Planning – Question 51

Data Analysis, Remote Sensing and Geo-informatics · Basic concepts in satellite remote sensing, satellites, sensors, and coverage · 1 mark · Multiple choice

Which spectral bands calculate NDVI?

Green and blue
Green and near-infrared
Near-infrared and red
Red and green

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Correct answer: (C) Near-infrared and red

Explanation

NDVI=(NIR−Red)/(NIR+Red), so C. Healthy vegetation strongly reflects near-infrared while chlorophyll absorbs red light; the contrast provides the vegetation indicator. Green or blue alone does not form this standard normalised-difference index.

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