For the measurement/estimation of which of the following are satellite images/remote sensing data used?
- Chlorophyll content in the vegetation of a specific location
- Greenhouse gas emissions from rice paddies of a specific location
- Land surface temperatures of a specific location
Select the correct answer using the code given below.(2019)
a) 1 only
b) 2 and 3 only
c) 3 only
d) 1, 2 and 3
Answer : D
Thematic mappers take images in multiple wavelengths of electro-magnetic radiation (multi-spectral) and based on this survey. They can measure the chlorophyll content.
Radiometers and photometers are the most common instrument in use, collecting reflected and emitted radiation in a wide range of frequencies. They may also be used to detect the emission spectra of various chemicals, providing data on chemical concentrations in the atmosphere and hence can measure the greenhouse gas emissions.
Land surface temperatures can also be measured using remote sensing technology.