Surveying
The point where vertical line passing through the perspective centre intersects the plane of the photograph, is known as

Photo plumb point
Nadir point
Plumb point
Isocenter

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Surveying
Contour interval is

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

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Surveying
The First Point of Aeries

Is the point in the celestial sphere where zero meridian crosses the celestial equator
Is usually denoted by the Greek letter ?
Is located near the very conspicuous rectangle of stars in the constellations of Pegasus and Andromeda
All listed here

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