Aerial Photogrammetry PYQs, GPSC Civil Engineering

Parallax in aerial photographs is an error due to

A) Movement of camera and ground relief

B) Overlap in photographs

C) Distortion caused by camera lens

D) Distortion due to lack of focus

A) Movement of camera and ground relief


In a vertical photograph, relief displacement is always radial from the

A) Isocenter

B) Nadir point

C) Zenith point

D) Principal point

D) Principal point


Overlap in aerial photography refers to

A) The overlap of ground features due to inclination of cameras

B) the overlap of ground features due to difference in elevations of objects

C) the same ground features taken from two camera positions

D) the blurring due to lack of focus in photographs

C) the same ground features taken from two camera positions


The angle between the observer’s meridian and declination circle of the heavenly body is referred to as:

A) Azimuth

B) Declination

C) Sidereal angle

D) Hour angle

D) Hour angle


The Mercator projection system used in atlases uses a

A) Isometric projection

B) Conical projection

C) Cylindrical projection

D) Azimuthal projection

C) Cylindrical projection


Optimal flight planning for a photogrammetric survey should be carried out considering

A) only side-lap

B) only end-lap

C) either side-lap or end-lap

D) both side-lap as well as end-lap

D) both side-lap as well as end-lap


The elevations of objects on an aerial photograph can be measured due to

A) Tilt

B) Drift

C) Overlap

D) Stereoscopic fusion

D) Stereoscopic fusion


Terrestrial photogrammetry is taking photographs of

A) the terrain of the earth from a moving aircraft

B) the terrain of the earth from a static aircraft

C) the terrain of the earth from cameras on ground

D) celestial bodies from a moving aircraft

C) the terrain of the earth from cameras on ground


If S denotes the sum of all the angles of a spherical triangle then the quantity S-180 is called as?

A) Spherical error

B) Spherical deficiency

C) Spherical excess

D) Spherical misclosure

C) Spherical excess


Spectral resolution means:

A) The frequency of receiving radiations

B) sensitivity of the system to small changes in radiation

C) the ability of the system to distinguish the details in the images

D) the wavelengths to which the remote sensing system is sensitive

D) the wavelengths to which the remote sensing system is sensitive


Practice Test On Aerial Photogrammetry & Field Astronomy PYQs, Surveying PYQs (Section 1-1)

GPSC Civil Engineering Previous Year Asked Questions

1 / 10

Terrestrial photogrammetry is taking photographs of

2 / 10

The elevations of objects on an aerial photograph can be measured due to

3 / 10

Parallax in aerial photographs is an error due to

4 / 10

If S denotes the sum of all the angles of a spherical triangle then the quantity S-180 is called as?

5 / 10

Optimal flight planning for a photogrammetric survey should be carried out considering

6 / 10

The Mercator projection system used in atlases uses a

7 / 10

Spectral resolution means:

8 / 10

Overlap in aerial photography refers to

9 / 10

The angle between the observer’s meridian and declination circle of the heavenly body is referred to as:

10 / 10

In a vertical photograph, relief displacement is always radial from the

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