Civil Services Prep

Prelims 2019 · Science and Technology · Question 92

For the measurement/estimation of which of the following are satellite images/remote sensing data used?<br/>1. Chlorophyll content in the vegetation of a specific location<br/>2. Greenhouse gas emissions from rice paddies of a specific location<br/>3. Land surface temperatures of a specific location<br/><br/>Select the correct answer using the code given below.

  1. 1 only
  2. 2 and 3 only
  3. 3 only
  4. 1, 2 and 3

Answer

1, 2 and 3

1. Chlorophyll content in vegetation — Yes. Remote sensing uses spectral reflectance indices like NDVI/red-edge bands to estimate vegetation health and chlorophyll content. Verdict: Correct.

2. Greenhouse gas emissions from rice paddies — Yes. Satellite/remote sensing data are used to estimate methane/other GHG emissions from rice fields indirectly through mapping inundation, crop stage, biomass and related models. Verdict: Correct.

3. Land surface temperatures — Yes. Thermal infrared sensors on satellites directly estimate land surface temperature. Verdict: Correct.

Hence, all three can be measured/estimated using satellite images/remote sensing data.

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