Self Studies

Surveying Test 4

Result Self Studies

Surveying Test 4
  • Score

    -

    out of -
  • Rank

    -

    out of -
TIME Taken - -
Self Studies

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Self Studies Self Studies
Weekly Quiz Competition
  • Question 1
    1 / -0
    For which of the following purposes can the Geographic Information System not be used?
    Solution

    A geographic information system (GIS) is a system designed to capture, store, manipulate, analyze, manage, and present geographic data.

    GIS has wide usage in the fields of science, government, business, and industry, with applications including real estate, public health, crime mapping, national defense, sustainable development, natural resources, climatology, landscape architecture, archaeology, regional and community planning, transportation and logistics.

    However it is not used for studying the relative motions on planets.
  • Question 2
    1 / -0

    A tower is photographed from an elevation of 1000 m above datum. The radial distance measured from principal points to the bottom and top of tower are 80 m and 100 m respectively. The bottom of the tower is at 300 m above ground level.

    Solution

    Concept

    Relief displacement (d) = r – ro

    Where,

    ‘r’ = Radial distance of top of tower from principal point

    ‘ro’ = Radial distance of top of tower from principal point

    The height of the tower (h) is given by

    h=d×(Hh1)r

    Where

    ‘H’ = Height above datum from where photograph is taken

    h1 = Elevation of the bottom of the tower from datum

    Calculation

    Given

    H = 1000 m

    h1 = 300 m

    r = 100 m, ro = 80 m

    Relief displacement (d) = r – ro

    d = 100 – 80 = 20 m

    Height of the tower (h) is given by

    h=d×(Hh1)r

    h=20×(1000300)100

    h = 140 m

  • Question 3
    1 / -0
    What is the radius of curve for an arc length equal to that of chord length of 10 m, given the degree of the curve is 5°?
    Solution

    We know that,

    Arc (A) = Radius of the curve (R) × Angle subtend by the arc (θ)

    Therefore,

    Radiusofthecurve(R)=Arc(A)Anglesubtendbythearc(θ)

    The angle subtended by the arc (θ) = 5180×π

    θ=0.0872radians

    Radiusofthecurve(R)=100.0872=114.6m

    Hence, the radius of the curve for given arc length and angle between them is 114.6 m.

  • Question 4
    1 / -0
    The system that uses the Sun as a source of electromagnetic energy and records the naturally radiated and reflected energy from the object is called
    Solution

    Remote sensing:

    Remote sensing is the process of detecting and monitoring the physical characteristics of an area by measuring it's reflected and emitted radiation at a distance typically from satellite or aircraft. Special cameras collect remotely sensed images, which help researchers "sense" things about the Earth.

    Types of remote sensing

    1.Active Remote Sensing

    Active sensors emit energy to scan objects and areas and a sensor then detects and measures the radiation that is reflected or backscattered from the target.

    Examples:  RADAR and LiDAR 

    2.Passive Remote Sensing

    Passive sensors gather radiation that is emitted or reflected by the object or surrounding areas. Reflected sunlight is the most common source of radiation measured by passive sensors.

    Examples: film photography, infrared, charge-coupled devices, and radiometers.

  • Question 5
    1 / -0

    IF the number of photographs required to cover an area of 600 km2 is 725 and the ratio of longitudinal overlap to side overlap is 3. Scale of the aerial photograph used will be 1 in _________.

    Assume size of photograph to be 36 cm × 36 cm and side overlap to be 25%.

    Solution

    Concept:

    Area covered by one photograph

    a=(1PL)(1PS)(L×W)×1S2

    L = length of photograph in the direction of flight

    W = width of photograph normal to the direction of flight

    S = scale of photograph

    PL = longitudinal overlap

    PS = side overlap

    Numberofphotographs=totalareatobecovered(A)areacoveredbyonephotograph

    Calculation:

    N = 725

    PLPS=3

    PS = 25%

    PL = 75%

    L = 36 cm

    W = 36 cm

    a=(175100)(125100)(36×36)×1010×1S2

    a=243×1010S2(km2)

    A = 600 Km2

    725=N=Aa=600×S2243×1010

    Scale=15835.84

    i.e. 1 in 5835.84

  • Question 6
    1 / -0

    The measured co-ordinates on the vertical photographs are

    Xa = +15.50 mm

    Ya = -71.20 mm

    Xb = +109.20 mm

    Yb = -25.20 mm

    The elevations of a and b are 502 m and 525 m respectively. If the flying height above the datum is 1670 m, the ground distance of a line AB will be ______ m.

    Assume focal length to be 158 mm.

    Solution

    Concept:

    The distance AB on ground is given by:

    AB=(XBXA)2+(YBYA)2 

    XB=xbf(HhB)Xa=xaf(Hha) 

    YB=ybf(Hhb)YA=yaf(Hha) 

    Calculation:

    ha = 502 m, hb = 525 m

    H = 1670 m

    xa = +15.50 mm

    xb = = +109.20 mm

    ya = -71.20 mm

    yb = -25.20 mm

    Xb=109.20158(1670525) 

    Xb = 791.35 m

    Xa=15.50158(1670502) 

    Xa = 114.58 m

    Yb=25.20158[1670525] 

    Yb = -182.62 m

    Ya=71.20158[1670502] 

    Ya = -526.34 m

    AB=(791.35114.58)2+(182.62(526.34))2 

    AB = 759.05 m

  • Question 7
    1 / -0

    Consider the following statements regarding the Remote Sensing Survey:

    1) Information transfer is accomplished by the use of electromagnetic radiation

    2) Remote Sensing from space is done by satellites

    3) Remote Sensing has no application in Earthquake prediction

    Which of the above statements are correct?

    Solution

    Remote sensing survey:

    It is the art and science of obtaining information about an object or feature without physically coming in contact with that object.

    Characteristics of remote sensing

    1. The data collected using it is in various forms such as variations in acoustic wave distributions (SONAR), variations in force distributions (gravity meter), variations in electromagnetic energy distributions.
    2. The remote sensing is the process of inferring surface parameters from measurements of the electromagnetic radiation (EMR) from the Earth’s surface.
    3. In space-borne remote sensing, sensors are mounted on a satellite orbiting the earth.


    Advantages of remote sensing are:

    1. Remote sensing provides data on large areas.
    2. It can be used to obtain data of very remote and inaccessible regions.
    3. With the help of remote sensing imagery of any area over a continuous period through which any natural changes in the landscape (earthquake) can be analyzed.
    4. It is relatively cheap when compared to employing a team of surveyors.
    5. Easy and rapid collection of data.
    6. Rapid production of maps for interpretation.
  • Question 8
    1 / -0

    Consider the following statements about Global Positioning Systems (GPS):

    1) The position of an object can be exactly determined by a single satellite

    2) The position of the observer (moving person or vehicle) on the ground is determined by an orbiting satellite

    3) Atomic clocks are fixed in satellites to calculate the positioning of the satellite to aid in determining travel times.

    4) Absolute positioning, where an accuracy of 1 cm to 5 cm is needed, depends upon the health of the satellite

    Which of the above statements are correct?
    Solution

    The following table gives information regarding the Global Positioning System.

    Global Positioning System

    Characteristics of GPS

    1. For a stationary objects minimum, 3 satellites are required.
    2. For moving objects minimum, 4 satellites are required.
    3. The position of the observer (moving person or vehicle) on the ground is determined by an orbiting satellite
    4. Atomic clocks are fixed in satellites to calculate the positioning of the satellite to aid in determining travel times.
    5. Absolute positioning, where accuracy of 1 cm to 5 cm is needed, depends upon the health of the satellite.

    Applications of GPS

    1. Geodetic Control surveys
    2. Cadastral surveys
    3. Photogrammetry, Remote sensing and Surveying
    4. Geographical Information systems (GIS)
    5. Military applications
      1. Navigation
      2. Tracking
      3. Bomb and missile guidance
      4. Rescue
      5. Map updation
Self Studies
User
Question Analysis
  • Correct -

  • Wrong -

  • Skipped -

My Perfomance
  • Score

    -

    out of -
  • Rank

    -

    out of -
Re-Attempt Weekly Quiz Competition
Self Studies Get latest Exam Updates
& Study Material Alerts!
No, Thanks
Self Studies
Click on Allow to receive notifications
Allow Notification
Self Studies
Self Studies Self Studies
To enable notifications follow this 2 steps:
  • First Click on Secure Icon Self Studies
  • Second click on the toggle icon
Allow Notification
Get latest Exam Updates & FREE Study Material Alerts!
Self Studies ×
Open Now