Surveying
23 cm × 23 cm photographs are taken from a flying height with a camera of focal length of 3600 m and 15.23 cm respectively. A parallax difference of 0.01 mm represents

4 m
3 m
1 m
2 m

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Surveying
In triangulation surveys

Control stations are located from which detailed surveys are carried out
All listed here
The area is divided into triangular figures
Sides are not measured excepting the base line

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