Surveying
Contour interval is

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

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Surveying
The cross hairs in the surveying telescope are placed

anywhere between eye-piece and objective lens
much closer to the objective lens than to the eye piece
midway between eye piece and objec-tive lens
much closer to the eye-piece than to the objective lens

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