ELEMENTS OF REMOTE SENSING QUIZ

The coherence length over which there is a strong relationship between amplitudes is;

The square of the bandwidth

None of these

Inversely proportional to the bandwidth

Directly proportional to the bandwidth

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A passive sensor uses:

Sun as the source of energy

None of these

Flash light as a source of energy

Its own source of energy

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Electromagnetic radiation:

All of these

Produces a time varying magnetic field and vice versa

Once generated, remains self-propagating

Is capable to travel across space

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

230 km

130 km

500 km

250 km

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The changes in the reflectivity/emissivity with time, is called:

Spatial variation

Temporal variation

Spectral variation

None of these

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Pick up the important characteristic of a target which facilitates its identification from the following:

All of these

Spatial variation

Temporal variation

Spectral variation

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‘A’ and ‘B’ are two towers of equal height diametrically opposite on either side of the nadir point, at 3 km and 5 km distances. Which one of the following statements is correct?

Height displacement of A and B will be towards each other

Height displacement of A and B is equal

Height displacement of A will be less than that of B

Height displacement of B will be less than that of A

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Which one of the following helps to identify the objects on the earth surface?

Atmospheric window

Signature

None of these

Radiometric error

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A perfectly black body:

Emits power of every wave length

Absorbs all the radiations of every wave lengths

Is a diffuse emitter

All listed here

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Which one of the following statement is correct?

The rate of transfer of radiant energy is called flux and is expressed in watts

All of these

The radiant energy which falls upon a surface is termed as irradiance

Radiant energy expressed in Joules, is the energy associated with electromagnetic radiation

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