Surveying
The difference of parallax for a given difference in elevation is independent of

Overall size of the photo graphs
Percentage of overlap
Focal length of the camera
All listed here

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Surveying
Spring tides are caused when

None of these
Solar tidal force acts opposite to lunar tidal force
Solar tidal force and lunar tidal force both coincide
Sun and moon are in line with earth

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Surveying
In triangulation surveys

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

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