Photogrammetry is used to determine which of the following from imagery?

• A. Calculating wind speeds
• B. Measuring distances and sizes
• C. Detecting electrical signals
• D. Analyzing soil pH

Answer: (C)

Photogrammetry extracts real-world measurements from photographs by using the geometry of how scenes are captured. From imagery, you can determine distances between features, sizes of objects, and 3D positions when you have multiple views or stereo pairs. This is why measuring distances and sizes is the best match for what photogrammetry does. The other options involve data types that imagery alone doesn’t provide: wind speeds require temporal motion analysis, detecting electrical signals needs sensors designed for signals, and soil pH is determined through chemical testing, not visual measurements.