Surveying
Contour interval is

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

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Surveying
The length of a chain is measured from

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