Civil Engineering :: Elements of Remote Sensing
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Pick up the correct statement from the following:
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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?
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Remote sensing techniques makes use of the properties of-----emitted, reflected or diffracted by the sensed objects:
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Which one of the following parameters is accurate for DGPS.
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The most widely used antenna in GPS is
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Which one of the following statements regarding remote sensing is correct.
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An Electromagnetic wave falls on to a boundary between two loss 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 :
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Which one of the following relationship between the wave length (λ), and frequency and the speed (C) of the electromagnetic wave is correct ?
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The various stages occuring in GPS system are described below :
1. Generation of an output to the user
2. Detection of the GPS signal
3. Processing the data in the built-in-computer
4. Decoding the GPS signal.
The correct sequence of the stages is : -
The reflection of solar energy is characterised by the water content in the leaf, in the reflective optical infrared:
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A.
Phase of a wave is expressed as a fraction of a period with respect to a refrence |
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B.
Phase is usually specified by angular measure with one period being 360° |
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C.
The reference for finding the phase of a wave is taken from the previous passage through zero from the negative to the positive direction. |
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D.
All of these |
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A.
Positional accuracies ~ 1 - 2 m if rover is less than 1-2 km from the reference station |
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B.
Positional accuracies ~ 2 - 5m if rover is less than 2-5 fm from the reference station |
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C.
Positional accuracies ~ 5 - 10 m if rover is less than 5-10 km from reference station |
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D.
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