Surveying
The following points form a pair of homologous points:

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

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Surveying
The necessary geometrical condition for triangulation adjustment is:

The sum of the angles around a station should be 360°
All listed here
The sum of the eight angles of a braced quadrilateral should be 360°
The sum of the three angles of a plane triangle should be 180°

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