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What Does Index Contour Mean?

Index contours are bold or thicker lines that appear at every fifth contour line. If the numbers associated with specific contour lines are increasing, the elevation of the terrain is also increasing. If the numbers associated with the contour lines are decreasing, there is a decrease in elevation.

What Does Index Contour Mean?

Index contour is a feature on a topographic map that allows the reader to determine the elevation of the land represented by the contour lines.

Index contour lines are usually heavier and more widely spaced than other contour lines on the map. The index contour interval is the elevation difference between two successive index contours.

A topographic map is a twodimensional representation of the threedimensional surface of the earth. It is created by using contour lines to depict changes in elevation.

Index contour lines are an important tool for reading a topographic map because they provide a reference for the elevation of the land represented by the other contour lines on the map.

Contour lines are created by drawing a line on a map that connects points of equal elevation. Index contour lines are heavier and more widely spaced than other contour lines because they indicate a change in elevation that is greater than the contour interval.

The contour interval is the vertical distance between contour lines. Index contour lines are important for determining the elevation of the land represented by the other contour lines on the map.

If the contour interval is known, the elevation of the land represented by a contour line can be determined by adding or subtracting

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