Surveying
The net ground area of a vertical photograph 20 cm × 20 cm on scale 1 : 10,000 having overlaps 60% and 30%, is

0.60 sq km
0.64 sq km
0.50 sq km
0.56 sq km

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Surveying
For mapping any country

Geodetic triangulation of greatest possible sides and accuracy is carried out
All listed here
Primary triangles are broken down into secondary triangles of somewhat lesser accuracy
Secondary triangles are further broken into third and fourth order triangles, the points of which are used for detail surveys

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