ELEMENTS OF REMOTE SENSING QUIZ

Critical angle of electromagnetic radiation takes place if

Angle of incidence is equal to 90°

Angle of refraction is equal to 90°

Angle of incidence is equal to angle of refraction

Angle of incidence is greater than the angle of refraction

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For interpolation of satellite data used for monitoring dynamic changes that occurs on the earth surface, the most suitable orbit for the satellite is:

Near polar orbit

None of these

Circular orbit

Sun-synchronous orbit

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Which one of the following statement is incorrect regarding the electromagnetic radiation?

These are produced by the motion of electric charge

The changing electric fields induce the changing magnetic fields in the surrounding medium

The oscillation of charged particles sets up changing electric fields

None of these

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The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface are called:

Active sensors

None of these

Passive sensors

Sensors

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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

250 km

130 km

500 km

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Which one of the following statements regarding remote sensing is correct?

The emission of electromagnetic radiation from the target

The interaction of the electromagnetic radiation with the target

Both (A) and (B)

Neither (A) nor (B)

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

Signature

None of these

Radiometric error

Atmospheric window

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The refractive index of the ocean water:

Increases with salinity

Increases with temperature

Decreases with temperature

Decreases with salinity

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Due to scan geometry of a satellite sensor:

The details towards the edge of the scan get compressed

The off-nadir resolution is degraded

All of these

The ground distance swept by the senor, IFOV is proportional to sec2θ, where θ is the angle of scan measured from the nadir

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The remote sensing techniques applied for the earth's surface features, is generally confined to the following wave lengths:

All of these

0.4 to 1.3, 1.5 to 1.8, 2.2 to 2.6 μm

2.2 to 2.6, 3.0 to 3.6, 4.2 to 5.0 μm

4.2 to 5.0, 7.0 to 15.0 μm and 1 cm to 30 cm

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