Surveying
If 16 flight lines are run perpendicular to an area 30 km wide, their spacings on a photographical map on scale 1 : 50,000 , will be

1 cm
2 cm
4 cm
3 cm

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Surveying
For mapping any country

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

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Surveying
Which of the following errors cannot be eliminated by taking both face observations ?

None of these
index error i.e. error due to imperfect adjustment of the vertical circle vernier
error due to non-parallelism of the axis of telescope level and line of collimation
error due to horizontal axis not being perpendicular to the vertical axis

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