A contour line is a line linking points of equal height on a map. They are drawn at regular intervals, often every 20m or 25m of elevation.
They can be used to show the shape (contours) of the land. Closer contour lines mean a steeper slope, while wider spaces show a gentler slope.
it is a contour line of elevation Control index contour, or just index contour
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A contour line is a line defining elevation on a map.
A contour line in art is an outline of a subject with no shading.
Contour interval
It makes it easier to count the number of contour lines.
lower.
An Index Contour
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.
When a V-shaped contour line points downhill, it means that the contour line is under very low elevation. And incase your wondering about when the contour line is uphill, it means that the elevation level is very high.
The first contour line was created by Charles Hutton in 1771. He used contour lines to map a coal mine.
A depression contour is a contour line that represents a lower elevation compared to the surrounding terrain. A contour line is a line on a map connecting points of equal elevation, indicating the shape of the land surface.