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If the contour interval is not given, find two reference (labeled) contour lines and find the number of lines between them, excluding the reference lines themselves. Then the interval can be found using the following formula:

|(Difference between elevation of reference lines)|

/(Number of contour lines between reference lines +1) = Contour interval

For example, if you find two reference lines labeled 150m and 250m and there is one contour line between them, then

|150m-250m|/(1+1)=100m/2=50m

The contour interval of that map is 50 meters.

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11y ago
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3y ago

the difference in elevation represented by each contour line on a topographic map

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7y ago

Contour interval is the height between contour lines drawn on a map. The measurement used is usually printed on the map, usually in metres on modern maps.

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10y ago

amount of brownies

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Q: What are the factors effecting contour intervals?
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