ELEMENTS OF REMOTE SENSING QUIZ

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

All of these

Radiant energy (Q)

Radiant intensity (I)

Radiant flux (φ)

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Which one of the following parameters is accurate for DGPS?

Positional accuracies ~ 5 - 10 m if rover is less than 25 km

Positional accuracies ~ 2 - 5 m if rover is less than 2-5 km from the reference station

Positional accuracies ~ 1 - 2 m if rover is less than 1-2 km from the reference station

Positional accuracies ~ 5 - 10 m if rover is less than 5-10 km from reference station

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

Atmospheric window

Signature

Radiometric error

None of these

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A perfectly black body:

All listed here

Emits power of every wave length

Is a diffuse emitter

Absorbs all the radiations of every wave lengths

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The altitudinal distance of a geostationary satellite from the earth is about:

30,000 km

36,000 km

26,000 km

44,000 km

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If θ is the angle of scan measured from the nadir, the ground distance swept by the sensor IFOV is proportional to:

sin²θ

tan²θ

cos²θ

sec²θ

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The arrangement of terrain features which provides attributes: the shape, size and texture of objects, is called:

None of these

Temporal variation

Spectral variation

Spatial variation

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In the given figure the phase of

Trough C is 3π/2

B crossing is π

Crest A is π/2

All of these

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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

500 km

250 km

130 km

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The reflection of solar energy is characterized by the water content in the leaf, in the reflective optical infrared:

Visible (0.4 - 0.7 μm) region

Short wave-IR (1.3 - 2.7 μm) region

Near-IR (0.7 - 1.3 μm) region

None of these

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