Question

In a Landsat-8 scene, digital number (DN) values of a pixel in band-4, band-5 and band-10 are 80, 100 and 30, respectively. What would be the NDVI value for the same pixel (round off to 3 decimal places)?

• A. \( 0.111 \)
• B. \( 0.222 \)
• C. \( 0.556 \)
• D. \( 0.889 \)

Hint:

Remember the NDVI formula and the corresponding bands for the satellite being used (Landsat-8 in this case).

Answer 1

The Correct Option is A

The Normalized Difference Vegetation Index (NDVI) is calculated using the near-infrared (NIR) and red bands of a satellite image. For Landsat-8, band-5 is the NIR band, and band-4 is the red band. Band-10 is a thermal infrared band and is not used in the NDVI calculation. The formula for NDVI is: $$NDVI = \frac{NIR - Red}{NIR + Red}$$ Given values: NIR (Band-5) = 100 Red (Band-4) = 80 Plugging these values into the formula: $$NDVI = \frac{100 - 80}{100 + 80} = \frac{20}{180} = \frac{1}{9}$$ Converting this fraction to a decimal and rounding to three decimal places: $$NDVI = 0.111111... \approx 0.111$$