Civil Engineering - Elements of Remote Sensing

Exercise :: Elements of Remote Sensing - Section 2

16. 

A passive sensor uses :

A. sun as the source of energy
B. flash light as a source of energy
C. its own source of energy
D. None of these

Answer: Option A

Explanation:

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17. 

The infrared portion of EMR lies between

A. 0.4 - 0.7 μm
B. 0.5 mm to lm
C. 0.7 - 1.3 μm
D. 0.7 to 14 μm

Answer: Option D

Explanation:

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18. 

Who coined the term, 'Remote sensing'.

A. Evelyn L. Pruitt, a geographer
B. Gaspard Felix Tournachon, a French scientist
C. Wilbur Wright, an Italian sciencist
D. None of these

Answer: Option A

Explanation:

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19. 

For C band Synthetic Aperture Radar (SAR) with Doppler band width of 1300 Hz, the coherence length lcoh is:

A. 130 km
B. 230 km
C. 250 km
D. 500 km

Answer: Option B

Explanation:

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20. 

Pick up the correct statement from the following:

A. A graphical representation of spectral reflectance versis the various growth stages of a crop, depicts a phenologic pattern
B. The changes in the polarisation of the radiation reflected or emitted by an object, is known as polarisation variation.
C. The degree of polarisation is a characteristic of the object which helps in the identification of the object.
D. Signatures only provide statistical nature and are not completely deterministic
E. All of these

Answer: Option E

Explanation:

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