Surveying
The shortest distance between two places measured along the surface of the earth, is

Length of the parallel between their longitudes
Length of the arc of the great circle passing through them
None of these
Length of the equator between their longitudes

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Surveying
Homologous points are

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

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Surveying
The difference between a level line and a horizontal line is that

horizontal line is normal to plumb line while level line may not be normal to the plumb line
both are same
level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line
level line is a curved line while hori-zontal line is a straight line

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