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Civil Engineering Objective Questions { Elements Of Remote Sensing }



29. The changes in the reflectivity/emissivity with time, is called :
A. spectral variation
B. spatial variation
C. temporal variation
D. None of these
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30. 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 phenologie 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. All of these
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31. The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface, are called :
A. sensonrs
B. passive sensors
C. active sensors
D. None of these ?
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32. The basic requirement of any sensor system, is :
A. radiometric resolution
B. spatial resolution
C. spectral resolution
D. All of these
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33. Pick up the correct statement from the following :
A. In remote sensing technique, the observation place, is called a platform
B. Platforms may be either stationary or mobile
C. Spatial resolutr of the imaging system becomes poorer with inc ase of platform height.
D. All of these
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34. Earth observations from a satellite platform provides:
A. synoptic view of a large area
B. constant solar zenith angles and similar illumination conditions.
C. repetitive observations of the same area with intervals of a few minutes to a few weeks
D. All of these
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35.  Repetitive observations of the same area at equal interval of time, are useful to monitor the dynamic phenomena :
A. Cloud evolution
B. Vegetative cover
C. Snow cover
D. All of these
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