it is a contour line of elevation Control index contour, or just index contour
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What are the difference's between contour interval and index contour?
A thicker line that has numbers written on it showing the rising or decreasing elevation on a topographic map By Ash Every fifth contour line on a topographic map, usually thicker, used to label elevation.
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the contour interval is the difference in elevation between contour lines that are next to each other
A complicated contour is heavier.
index contour lines have numbers contour lines dont
It makes it easier to count the number of contour lines.
The difference in elevation between two contour lines that are side by side is the contour interval. The contour interval is the vertical distance between two adjacent contour lines on a topographic map.
Contour belt
An Index Contour