long information of index contour
Answers
Explanation:
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.
Start with the next line of the index line, Counting each contour line up to and including the next index line. To find the elevation interval between the contour lines, Divide the difference in elevation between the index lines by the number of contour lines from one index line to the next.
There are 3 kinds of contour lines you'll see on a map: intermediate, index, and supplementary.
Rule 1 - every point of a contour line has the same elevation. Rule 2 - contour lines separate uphill from downhill. Rule 3 - contour lines do not touch or cross each other except at a cliff. Rule 4 - every 5th contour line is darker in color.
Contour lines (thinner lines) between index contours are called intermediate contour lines. In the map shown below, the elevation difference between index lines is 100 meters. The elevation difference or vertical distance between two adjacent contour lines would be 20 meters (100 : 5 = 20).
To make topographic maps easier to read, every fifth contour line is an index contour. The index contour lines are the only ones labeled.
Contour lines are lines drawn on a map connecting points of equal elevation, meaning if you physically followed a contour line, elevation would remain constant. Contour lines show elevation and the shape of the terrain. They're useful because they illustrate the shape of the land surface — its topography — on the map.
A hill is shown on a map by contour lines forming concentric circles. The inside of the smallest closed circle is the hilltop. Hill = an area of high ground; generally, a smaller and rounder than a mountain, and less steep.
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