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

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
both are same
horizontal line is normal to plumb line while level line may not be normal to the plumb line

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Surveying
Pick up the correct statement for horizontal photographs.

All listed here
The lines parallel to the negative plane are projected as parallel lines
The two sides of a road meet at the vanishing point
Parallel lines do not appear parallel in central projection

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Surveying
Contour interval is

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

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