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Surveying

Surveying
The correction for parallax, is

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

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Surveying
The following points form a pair of homologous points:

Photo principal point and ground principal point
Photo isocenter and ground isocenter
All listed here
Photo plumb point and ground plumb point

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Surveying
For a well-conditioned triangle, no angle should be less than

30°
60°
45°
20°

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Surveying
The maximum error in radial line assumption, is

h/H f cos θ
h/H f² sin θ
h/H f tan θ
h/H f² tan θ

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Surveying
For a tacheometer the additive and multi-plying constants are respectively

0 and 100
100 and 100
100 and 0
0 and 0

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Surveying
Equation of time which is the difference between apparent solar time and mean solar time at any instant, vanishes during one year

Twice
Thrice
Four times
Once

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