Surveying Questions and Answers – Photogrammetric Surveying – Parallax in Aerial Stereoscopic Views

This set of Surveying Objective Questions & Answers focuses on “Photogrammetric Surveying – Parallax in Aerial Stereoscopic Views”.

1. Difference in parallax can be obtained due to___________
a) Distance between zenith
b) Distance between bearing
c) Distance between azimuth
d) Distance between points sights
View Answer

Answer: d
Explanation: Parallax is a state where there is an apparent movement of point viewed first with one eye and then viewed with another eye. If the difference in distance between the points sighted is measured then it can yield the difference in parallax.

2. Which of the following can be used to view stereo pair?
a) Aerial camera
b) Stereoscope
c) Stereoscopic camera
d) Telescope
View Answer

Answer: b
Explanation: Stereo pair involves stereoscopic fusion, where the objects which are visualized from left eye and right eye are combined for generating output. Stereo pair can be viewed by using stereoscope and anaglyph.

3. Which of the following doesn’t come under the category of depth perception?
a) Accommodation
b) Head parallax
c) Divergence
d) Retinal display
View Answer

Answer: c
Explanation: Depth perception involves determining the relative distance between the objects from the observer. It involves certain clues which are required for photogrammetry. Those are head parallax, convergence, accommodation, retinal display.

4. Which of the following indicates the correct set of stereoscope classifications?
a) Lens and azimuth stereoscope
b) Mirror and azimuth stereoscope
c) Mirror and lens stereoscope
d) Mirror stereoscope and stereo pair
View Answer

Answer: c
Explanation: Stereo pairs can be interpreted by using stereoscope, which is designed for assisting and magnifying perception of depth. Stereoscope has been classified as mirror stereoscope and lens stereoscope.

5. Which of the following indicate parallax equation for ground co-ordinate point?
a) X = B*x + p
b) X = B*x – p
c) X = B*x * p
d) X = B*x / p
View Answer

Answer: d
Explanation: The parallax equation for the ground co-ordinates of the point taken into consideration can be given as X = B*x / p. Here, B is the point considered, p is the parallax and x is the numerical value.
Note: Join free Sanfoundry classes at Telegram or Youtube

6. The distance between nodal point and plane of photograph depends on datum height.
a) False
b) True
View Answer

Answer: a
Explanation: The lens of stereoscope is having a greater importance in terms of visualizing an object. Two magnifying lens were used which makes it sight the object in accurate manner. The distance between nodal point and plane of photograph depends on the focal length of the lens.

7. Displacement due to successive exposures can be given as _____________
a) Visual parallax
b) Multiple exposure
c) Exposure
d) Parallax
View Answer

Answer: d
Explanation: Parallax in case of stereoscopic view can be given as the displacement of point in the image due to successive exposures. In order to minimize the parallax, difference in parallax is calculated. It is the successive difference in the points taken into consideration.

8. The value of overlapping parallax can be determined by ___________
a) P = x / xꞌ
b) P = x – xꞌ
c) P = x * xꞌ
d) P = x + xꞌ
View Answer

Answer: b
Explanation: The overlapping parallax indicated by symbol p can be determined by the difference of x-coordinate of the point measured on the left hand photograph to the x-coordinate of the point on right hand photograph.

9. Determine the value of parallax, if the x-coordinate on left hand photograph is 54 and on right hand photograph is 32.
a) 24
b) 12
c) 22
d) 27
View Answer

Answer: c
Explanation: The parallax can be determined by using the formula,
P = x – xꞌ. On substitution, we get
P = 54 – 32
P = 22.

10. Which of the following doesn’t serve as a condition for an aerial stereoscopic view?
a) Excessive overlapping
b) Elevation of camera for exposure
c) Vertical camera axis
d) Sufficient overlapping
View Answer

Answer: a
Explanation: The conditions for aerial stereoscopic view include photographs with sufficient overlapping, elevation of the camera for exposure and vertical camera axis. These are meant to be ideal conditions.

Sanfoundry Global Education & Learning Series – Surveying.

To practice all objective questions on Surveying, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

Subscribe to our Newsletters (Subject-wise). Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs!

Youtube | Telegram | LinkedIn | Instagram | Facebook | Twitter | Pinterest
Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

Subscribe to his free Masterclasses at Youtube & discussions at Telegram SanfoundryClasses.