ELEMENTS OF REMOTE SENSING QUIZ

The entire range of the electromagnetic spectrum spans a large spectrum of wave lengths varying from:

10-10 to 1010 m

10-8 to 108 m

10-8 to 106 m

10-10 to 106 m

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Which one of the following geometric errors of satellite sensors is random?

Altitude variation

Earth rotation

Scan skew

Panoramic distortion

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Repetitive observations of the same area at equal interval of time are useful to monitor the dynamic phenomena:

Cloud evolution

Vegetative cover

Snow cover

All of these

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Which one of the following quantities forms the basis of radiometry?

Radiant intensity (I)

Radiant energy (Q)

All of these

Radiant flux (φ)

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The refractive index of the ocean water:

Increases with temperature

Decreases with salinity

Increases with salinity

Decreases with temperature

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"An Electromagnetic wave falls on to a boundary between two losses less homogeneous media with different refractive indices, a part of the wave is reflected back to the incident medium and the rest is transmitted on to the second media". This phenomenon is known as:

Fresnel reflection

Snell's law

Fresnel refraction

None of these

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Due to scan geometry of a satellite sensor:

The off-nadir resolution is degraded

The details towards the edge of the scan get compressed

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

All of these

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Geodimeter is based on:

Propagation of infrared radiation

Propagation of modulated light waves

The visible light as carrier with frequency of the order of 5 × 1014 Hz

High frequency radio waves

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The part radiation due to scattered/diffused radiation entering the field of view of a remote sensor other than that from the required target,

Increases the contrast of the image but reduces the sharpness

Reduces the contrast but increases the sharpness

Increases both the contrast and sharpness

Reduces the contrast of the image and also its sharpness

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DGPS is based on the concept that bias errors in the position of locations in a given local area, are same if their distances are within

75 km

100 km

25 km

50 km

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