Surveying
The following sights are taken on a “turning point”

foresight and intermediate sight
foresight and backsight
foresight only
foresight only

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Surveying
Contour interval is

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

ANSWER DOWNLOAD EXAMIANS APP