Surveying
Assuming human normal vision distance 25 cm, smallest measurable angle 20", and intraocular distance 6.5 cm, the smallest depth to be discerned is

0.5 mm
1.1 mm
0.1 mm
1.00 mm

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Surveying
In triangulation surveys

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

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