Surveying
In a truly vertical photograph,

All listed here
Principal point coincides the isocenter
Iso-centre coincides the plumb point
Plumb point coincides the principal point

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Surveying
In the prismatic compass

the magnetic needle and graduated circle do not move with the box
the graduated circle is fixed to the box and the magnetic needle always remains in the N-S direction
the magnetic needle moves with the box
the line of the sight does not move with the box

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Surveying
Contour interval is

Larger for accurate works
Larger if the time available is more
Inversely proportional to the scale of the map
Directly proportional to the flatness of ground

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