In a vertical aerial photograph, relief displacement of a point increases when the point is:
Correct answer: B. Farther from the principal point
- A. Closer to the principal point
- B. Farther from the principal point
- C. At the exact flying height
- D. Located on level terrain only
Explanation
Relief displacement is radial from the principal point and increases with both the point's elevation relative to the datum and its radial distance from the principal point. A point near the principal point therefore shows less displacement for the same relief.
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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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