COLORADO PHOTOGRAMMETRY TECHNICIAN
CERTIFICATION EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) Q&A 2026
|INSTANT DOWNLOAD PDF
1. What is the primary purpose of photogrammetry?
A. Measuring rainfall patterns
B. Extracting geometric information from photographs
C. Recording soil chemistry
D. Detecting seismic activity
Answer: B
Rationale: Photogrammetry is the science of obtaining reliable
measurements from photographs, especially for mapping and
spatial analysis.
2. Which type of imagery is most commonly used in classical
photogrammetry?
A. Radar imagery
B. Satellite thermal imagery
C. Aerial photographs
D. Sonar images
Answer: C
Rationale: Aerial photographs are the foundation of traditional
photogrammetric measurements.
,3. What is a stereo pair in photogrammetry?
A. Two maps of different regions
B. Two overlapping images taken from different positions
C. Two GPS datasets
D. Two satellite sensors operating together
Answer: B
Rationale: Stereo pairs allow depth perception by providing
overlapping images from different viewpoints.
4. The concept of parallax in photogrammetry refers to:
A. Light distortion in lenses
B. Apparent shift of object position between images
C. Atmospheric refraction
D. Sensor calibration error
Answer: B
Rationale: Parallax is the displacement of an object’s apparent
position due to change in viewpoint.
5. What is the focal length of a camera lens?
A. Distance between ground and camera
B. Distance between lens center and image sensor
C. Distance between two stereo images
D. Height of terrain features
,Answer: B
Rationale: Focal length is the distance from the optical center
of the lens to the image sensor when focused at infinity.
6. What is an orthophoto?
A. A 3D terrain model
B. A distorted aerial image
C. An aerial photograph corrected for scale and relief
displacement
D. A satellite radar image
Answer: C
Rationale: Orthophotos are geometrically corrected so they
have uniform scale like a map.
7. Which instrument is traditionally used to view stereo
images?
A. Spectrometer
B. Photometer
C. Stereoscope
D. Barometer
Answer: C
Rationale: A stereoscope allows viewing two overlapping
images in 3D.
, 8. What does GNSS stand for?
A. Global Navigation Satellite System
B. Geographic Network Survey System
C. Ground Navigation Satellite Scanner
D. General Navigation Sensor System
Answer: A
Rationale: GNSS refers to satellite navigation systems like GPS,
Galileo, and GLONASS.
9. Which of the following is a digital elevation model (DEM)?
A. A 2D satellite image
B. A representation of terrain elevations
C. A weather map
D. A vegetation index map
Answer: B
Rationale: A DEM represents the bare-earth surface elevations.
10. What is ground control in photogrammetry?
A. Weather measurement stations
B. Known reference points on the earth’s surface
C. Drone landing zones
D. Satellite calibration signals
Answer: B
Rationale: Ground control points (GCPs) provide known
coordinates for georeferencing imagery.
CERTIFICATION EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) Q&A 2026
|INSTANT DOWNLOAD PDF
1. What is the primary purpose of photogrammetry?
A. Measuring rainfall patterns
B. Extracting geometric information from photographs
C. Recording soil chemistry
D. Detecting seismic activity
Answer: B
Rationale: Photogrammetry is the science of obtaining reliable
measurements from photographs, especially for mapping and
spatial analysis.
2. Which type of imagery is most commonly used in classical
photogrammetry?
A. Radar imagery
B. Satellite thermal imagery
C. Aerial photographs
D. Sonar images
Answer: C
Rationale: Aerial photographs are the foundation of traditional
photogrammetric measurements.
,3. What is a stereo pair in photogrammetry?
A. Two maps of different regions
B. Two overlapping images taken from different positions
C. Two GPS datasets
D. Two satellite sensors operating together
Answer: B
Rationale: Stereo pairs allow depth perception by providing
overlapping images from different viewpoints.
4. The concept of parallax in photogrammetry refers to:
A. Light distortion in lenses
B. Apparent shift of object position between images
C. Atmospheric refraction
D. Sensor calibration error
Answer: B
Rationale: Parallax is the displacement of an object’s apparent
position due to change in viewpoint.
5. What is the focal length of a camera lens?
A. Distance between ground and camera
B. Distance between lens center and image sensor
C. Distance between two stereo images
D. Height of terrain features
,Answer: B
Rationale: Focal length is the distance from the optical center
of the lens to the image sensor when focused at infinity.
6. What is an orthophoto?
A. A 3D terrain model
B. A distorted aerial image
C. An aerial photograph corrected for scale and relief
displacement
D. A satellite radar image
Answer: C
Rationale: Orthophotos are geometrically corrected so they
have uniform scale like a map.
7. Which instrument is traditionally used to view stereo
images?
A. Spectrometer
B. Photometer
C. Stereoscope
D. Barometer
Answer: C
Rationale: A stereoscope allows viewing two overlapping
images in 3D.
, 8. What does GNSS stand for?
A. Global Navigation Satellite System
B. Geographic Network Survey System
C. Ground Navigation Satellite Scanner
D. General Navigation Sensor System
Answer: A
Rationale: GNSS refers to satellite navigation systems like GPS,
Galileo, and GLONASS.
9. Which of the following is a digital elevation model (DEM)?
A. A 2D satellite image
B. A representation of terrain elevations
C. A weather map
D. A vegetation index map
Answer: B
Rationale: A DEM represents the bare-earth surface elevations.
10. What is ground control in photogrammetry?
A. Weather measurement stations
B. Known reference points on the earth’s surface
C. Drone landing zones
D. Satellite calibration signals
Answer: B
Rationale: Ground control points (GCPs) provide known
coordinates for georeferencing imagery.
