What is one of the uses of photogrammetry?

• A. Measuring distances and sizes
• B. Creating 3D models
• C. Determining color
• D. Generating heat maps

Answer: (A)

Photogrammetry uses overlapping photographs and camera geometry to derive real-world measurements. By identifying the same points in multiple images and knowing the camera positions and orientations, you can reconstruct the 3D coordinates of those points. From these 3D coordinates, you can calculate distances between points, determine the size of objects, and compute areas or volumes. This measurement capability is a fundamental, widely used outcome of photogrammetry, essential for surveying, mapping, and construction tasks. While it can also be used to create 3D models and to capture color information from the images, the ability to obtain accurate distances and sizes is the most direct and practical use.