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Home Civil Engineering Elements of Remote Sensing Comments

  • 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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    • 1. The basic requirement of any sensor system, is :

    • Options
    • A. radiometric resolution
    • B. spatial resolution
    • C. spectral resolution
    • D. temporal resolution
    • E. All of these
    • Discuss
    • 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
    • Discuss
    • 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
    • Discuss
    • 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
    • Discuss
    • 5. A reduction of nitrogen nutrient in plants :

    • Options
    • A. affects leaf colour
    • B. reduces pigment concentration
    • C. increase the visible reflectivity
    • D. All of these
    • Discuss
    • 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
    • Discuss
    • 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
    • Discuss
    • 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
    • Discuss
    • 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
    • Discuss
    • 10. The most widely used antenna in GPS is

    • Options
    • A. Parabolid antenna
    • B. Microstrip antenna
    • C. Horn antenna
    • D. Slotted antenna
    • Discuss


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