In aerial photogrammetry, fiducial marks on a camera photograph are used mainly to:
Correct answer: B. Define the reference system for photograph measurements
- A. Show the direction of magnetic north
- B. Define the reference system for photograph measurements
- C. Indicate the height of the aircraft above sea level
- D. Identify the highest point visible in the image
Explanation
Fiducial marks provide fixed reference points for establishing the photograph coordinate system. They are part of the camera geometry and do not indicate magnetic direction or aircraft height.
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Surveying covers measurement of distances, angles and elevations, traversing, levelling, contouring, plane table work, theodolites, total stations and basic photogrammetry. It includes error adjustment, coordinate calculations, area and volume determination, and the distinction between accuracy and precision, as well as between temporary and permanent adjustments.
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