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UPSC 2019: For the measurement/estimation of which of the following are satellite images/remote sensing data used? 1. Chlorophyll content in the vegetation of a specific location 2. Greenhouse gas emissions from rice paddies of a specific location 3. Land surface temperatures 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
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Not attemptedCorrect Answer: (d) 1, 2 and 3
Multispectral and thermal sensors on satellites can (1) estimate vegetation chlorophyll by analysing red-edge and near-IR bands, (2) quantify methane emissions from rice paddies using short-wave IR absorption features, and (3) measure land-surface temperature via thermal IR radiance. Thus all three statements are correct. ([drishtiias.com](https://www.drishtiias.com/prelims-analysis/2019-prelims-analysis))
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Frequently Asked Questions
What is the correct answer to this UPSC 2019 Science & Technology question?▼
The correct answer is option (d): 1, 2 and 3. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Space Technology & Astronomy question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2019, GS Paper 1, as Question 32. It falls under Science & Technology > Space Technology & Astronomy.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Space Technology & Astronomy?▼
UPSC has asked 69 questions from Space Technology & Astronomy (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.