index contour line

index contour line

A contour line made thicker to distinguish it from the contour lines on either side of it, and occurring at a multiple of the basic contour interval. Depending on the size of the contour interval, index contour lines are drawn as every fourth or fifth contour line, and usually with the corresponding elevation shown in a gap in the line. Sometimes incorrectly called an index contour.

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Industry/Domain: Earth science
Category: Mapping science
Company: American Congress on Surveying & Mapping
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