In aerial photogrammetry, stereoscopic overlap between photographs is primarily required to:
Correct answer: D. Provide two views for three dimensional measurement
- A. Increase the focal length of the camera
- B. Convert a vertical photograph into an oblique photograph
- C. Remove the need for ground control points
- D. Provide two views for three dimensional measurement
Explanation
Overlapping photographs provide two slightly different views of the same ground area, allowing stereoscopic vision and measurement of elevation. Overlap does not change the camera focal length or automatically eliminate all ground control requirements.
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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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