Surveying
The distance between the projection centre and the photograph, is called

Isocentric distance
Principal distance
Principal line
Focal length

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Surveying
The length of a chain is measured from

centre of one handle to centre of other handle
inside of one handle to inside of other handle
outside of one handle to outside of other handle
outside of one handle to inside of other handle

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

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
horizontal line is normal to plumb line while level line may not be normal to the plumb line
level line is a curved line while hori-zontal line is a straight line

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