UPSC Prelims 2019 – Question 32

Here is Question No. 32 a part of our series on UPSC Prelims 2019

Q32. For the measurement/estimation of which of the following are satellite images and remote sensing data is used?

1. Chlorophyll content in the vegetation of a specific location.
2. Greenhouse gas emission from rice paddies of a specific location.
3. Land surface temperature of a specific location.

Select the correct answer using the code given below:
(a) 1 only
(b) 2 and 3 only
(c) 3 only
(d) 1, 2 and 3

Answer: D

• Statement 1 is correct: The Sentinel satellite of the European Space Agency has certain specific spectral characteristics that can be used to measure even the chlorophyll content in the vegetation of a specific location.
• Statement 2 is correct: Satellite remote sensing data can provide spatially explicit information with regard to greenhouse gas emissions of a specific location. Rice paddies have been mapped from multi-temporal Synthetic Aperture Radar (SAR) data using backscatter change thresholds for many regions in Asia.
• Statement 3 is correct: The land surface temperature of a specific location can be measured with the help of satellite images/ remote sensing data.

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