it is a contour line of elevation Control index contour, or just index contour
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A contour interval is the vertical distance between contour lines on a topographic map, representing the change in elevation. An index contour is a heavier contour line that is labeled with the elevation value, to help users quickly identify key elevations on the map.
This management practice reduces risk of erosion by tilling and planting across (i.e., following the curvature of the land), rather than up and down. Planting done along the contour reduces water erosion by enhancing water infiltration. Water infiltration is enhanced because the contour planting is perpendicular to the slope, slowing water velocity, and allowing more of the water to soak into the ground. If the contour is perpendicular to the prevailing wind, wind erosion is also reduced.
A complicated contour is heavier.
W. J. Grice has written: 'Catchment planning and contour planting for safe water disposal, water and soil conservation in the plains areas of north-east India' -- subject(s): Contour farming, Tea, Terracing, Watershed management
An index contour is a thicker contour line that is labeled with the elevation of that contour. It usually appears every fifth contour line and helps to quickly identify elevation changes on a topographic map. Regular contour lines are thinner and connect points of equal elevation.
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.
A contour interval is the vertical distance between two contour lines on a map, representing the change in elevation. An index contour is a thicker contour line labeled with the elevation of the line above sea level, typically every fifth contour line. It helps users quickly identify elevation values on a map.
Contour belt