Which principle underpins photogrammetry?

Which principle underpins photogrammetry?

• A. It uses synchronized video streams
• B. It relies on overlapping photographs to create 2D/3D models
• C. It requires thermal imaging
• D. It uses manual measurement only

Answer: (B)

Photogrammetry rests on using overlapping photographs taken from different viewpoints to determine where points lie in 3D space. By spotting the same features in multiple images, the shift in their positions (parallax) lets you triangulate their real-world coordinates and reconstruct accurate 2D plans or 3D models. The overlap is essential because it provides those common reference points needed to solve the geometry and establish scale. Options that emphasize synchronized video streams, thermal imaging, or purely manual measurements miss this core mechanism. Video frames can be used, but the governing idea remains the perspective change captured in overlapping images; thermal imaging isn’t involved, and while measurements can be aided by manual input, the fundamental principle is extracting geometry from multiple views rather than manual distance gathering.

Photogrammetry rests on using overlapping photographs taken from different viewpoints to determine where points lie in 3D space. By spotting the same features in multiple images, the shift in their positions (parallax) lets you triangulate their real-world coordinates and reconstruct accurate 2D plans or 3D models. The overlap is essential because it provides those common reference points needed to solve the geometry and establish scale.

Options that emphasize synchronized video streams, thermal imaging, or purely manual measurements miss this core mechanism. Video frames can be used, but the governing idea remains the perspective change captured in overlapping images; thermal imaging isn’t involved, and while measurements can be aided by manual input, the fundamental principle is extracting geometry from multiple views rather than manual distance gathering.