Surveying
Homologous points are

Opposite corners of a photograph
Plumb points of stereo pair of photographs
Nodal points of the camera lens
Corresponding points on the ground and photograph

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Surveying
Pick up the correct statement from the following. The difference between the longitudes of the places is obtained.

By subtracting their longitudes if places are in the same hemisphere
All of these
By subtracting the sum of their longitudes exceeding 180° from 360° if places are in different hemispheres
By adding their longitudes if places are in the different hemispheres

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