Which one of the following parameters is accurate for DGPS. Positional accuracie

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Question
Which one of the following parameters is accurate for DGPS.
Options
A. Positional accuracies ~ 1 - 2 m if rover is less than 1-2 km from the reference station
B. Positional accuracies ~ 2 - 5m if rover is less than 2-5 fm from the reference station
C. Positional accuracies ~ 5 - 10 m if rover is less than 5-10 km from reference station
D. Positional accuracies ~ 5 - 10 m if rover is less than 25 km

Correct Answer

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

Elements of Remote Sensing problems

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2. Pick up the important characteristic of a target which facilitates its identification from the following:
Options
A. spectral variation
B. spatial variation
C. temporal variation
D. polarisation variation
E. All of these

3. Pick up the correct statement from the following :
Options
A. The distance between two successive crests or troughs of a wave, is called, the wave length
B. The wave length is measured in metres and a fraction of a metre
C. The wave length is generally denoted by ?
D. The length of the crest from the mid point, is called amplitude
E. All of these

4. The remote sensing techniques applied for the earth's surface features, is generally confined to the following wave lengths :
Options
A. 0.4 to 1.3, 1.5 to 1.8, 2.2 to 2.6 ?m
B. 2.2 to 2.6, 3.0 to 3.6, 4.2 to 5.0 ?m
C. 4.2 to 5.0, 7.0 to 15.0 ?m and 1 cm to 30 cm
D. All of these

6. 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 :
Options
A. 1, 2, 3, 4
B. 2, 3, 4, 1
C. 2, 4, 3, 1
D. 3, 1, 2 , 4

7. Which one of the following statements is correct?
Options
A. Snow albedo falls at all wave length with the increase of grain size
B. The effect of grain size on reflection is maximum in the near-IR region
C. The effect of grain size on reflection is low in the visible region of the spectrum
D. All of these

8. Pick up the correct statement from the following:
Options
A. Phase of a wave is expressed as a fraction of a period with respect to a refrence
B. Phase is usually specified by angular measure with one period being 360�
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.
D. All of these

9. Pick up the correct statement from the following :
Options
A. Topology describes the geometric characteristic of objects which do not change under transformations and are independent of any coordinate system
B. Topological characteristics of an object are independent of scale measurement
C. The three elements of topology are adjacency, containment, and connectivity
D. All of these

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