Certified Photogrammetrist Camera Calibration & Sensor Geometry 3

Question 1

What does exterior orientation of a photograph define?

Accepted Answer

The position and rotational attitude of the camera at the moment of exposure

Answer

Exterior orientation defines the six parameters — X, Y, Z position and omega, phi, kappa rotation angles — describing where the camera was and how it was oriented when the photo was taken.

Question 2

What are the three rotation angles used to describe camera orientation in standard photogrammetric convention?

Accepted Answer

Omega, phi, kappa

Answer

In photogrammetry, the three rotation angles omega (ω), phi (φ), and kappa (κ) define the rotational orientation of the camera relative to the ground coordinate system.

Question 3

The collinearity condition in photogrammetry states that:

Accepted Answer

An object point, the camera perspective center, and its image point must lie on a single straight line

Answer

The collinearity condition states that an object point, the camera's perspective center, and the corresponding image point must lie on the same straight line, which is the fundamental geometric basis of the photogrammetric equations.

Question 4

Which type of aerial camera lens has an angular field of view greater than 100 degrees and is used for small-scale mapping?

Accepted Answer

Superwide-angle lens (about 120°)

Answer

Superwide-angle lenses have angular fields of view greater than 100 degrees (typically ~120°), covering large ground areas per photograph, making them suited for small-scale topographic mapping.

Question 5

What is chromatic aberration in photogrammetric camera lenses?

Accepted Answer

The failure of a lens to focus different wavelengths of light at the same focal point

Answer

Chromatic aberration occurs when a lens fails to focus all wavelengths of light at exactly the same focal point, causing color fringing or reduced sharpness, particularly visible at high-contrast edges.

Certified Photogrammetrist Practice Test

Certified Photogrammetrist Practice Test

Certified Photogrammetrist Camera Calibration & Sensor Geometry 3