ELEMENTS OF REMOTE SENSING QUIZ

Remote sensing techniques make use of the properties of ___________ emitted, reflected or diffracted by the sensed objects:

Wind waves

Electromagnetic waves

Sound waves

Electric waves

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The infrared portion of EMR lies between

0.5 mm to 1 μm

0.7 to 14 μm

0.7 - 1.3 μm

0.4 - 0.7 μm

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Orbital radius of GPS satellites is approximately:

18,400 km

36,000 km

26,600 km

15,200 km

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Crop Acreage and Production Estimation (CAPE) was funded and taken up in 1983 by:

European Union

USA

India

Russia

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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

Sensors

Passive sensors

None of these

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The interaction of the electromagnetic radiation produced with a specific wave length to illuminate a target on the terrain for studying its scattered radiance, is called:

Active remote sensing

Neutral remote sensing

None of these

Passive remote sensing

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Electromagnetic spectrum contains:

Infrared rays (wave length < 10⁻⁴ m)

Gamma rays (wave length < 10⁻¹⁰ m)

Ultraviolet rays (wave length < 10⁻⁶ m)

All of these

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

Temporal variation

None of these

Spectral variation

Spatial variation

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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:

Circular orbit

Sun-synchronous orbit

None of these

Near polar orbit

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

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

These are produced by the motion of electric charge

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