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Surveying

Surveying
The correction for parallax, is

- 8".8 cos α
+ .8" sin α
+ 8".8 cos α
- 8".8 cos α

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Surveying
The parallax of a point on the photograph is due to

All listed here
Length of air base
Ground elevation
Flying height

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Surveying
If the image of a triangulation station of R.L. 500 m is 4 cm from the principal point of a vertical photo taken from an altitude of 2000 m, above datum, the height displacement will be

2 mm
10 mm
6 mm
4 mm

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Surveying
Longitudes are measured from 0° to

180° eastward
360° eastward
180° westward
180° east or westward

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Surveying
Invar tapes used for measuring base lines, is made of nickel-iron alloy containing nickel

0.4
0.24
0.36
0.6

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Surveying
In the cross-section method of indirect contouring, the spacing of cross-sections depends uponi) contour intervalii) scale of planiii) characteristics of groundThe correct answer is

(i), (ii) and (iii)
only (i)
(i) and (ii)
(ii) and (iii)

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