WHAT IS CONTOUR AND CHARACTERISTICS OF CONTOUR LINE?
CONTOUR :- A CONTOUR IS AN IMAGINARY LINE ON THE GROUND JOINING THE POINTS OF EQUAL ELEVATION.
IT is the line in which the surface of ground is intersected by a level surface. A contour line is a line on the map representing a contour.
CHARACTERISTICS OF CONTOUR:-
1 . Two contour lines of difference elevations cannot cross each other .
If they did the Point of intersection would have two different elevations which is absurd .
2. Contour lines of different elevations can intersect only in case of an overhanging cliff or a cave.
Overhanging cliff |
3 . Contour lines close together indicate steep slope .
They indicate a gentle slope if they are far apart .
If they are equally spaced , uniform slope is indicated .
A series of equally spaced contour lines indicate plane surface.
4 . A contour passing through any point is perpendicular to the line of steepest slope at that point .
5 . One or more closed higher contour line inside , it represents a hill ( Summit).
6. One or more closed lower contour line inside , it indicate a depression ( pond ) .
7. A contour line must close upon itself , though not necessarily within the limits of the map .
8 . Contours deflect uphill at valley lines and downhill at ridge lines.
Contour lines U - shape cross a ridge and in V shape cross a valley at right angles .
The concavity in contour lines is towards higher ground in case of ridge and towards lower ground in case of valley .
9. Contour lines cross a watershed or ridge line at right angles .
They form curves of U-shape round it with the concave side of the curve towards the higher ground .
10 . The same contour appears on either sides of a ridge or valley .
For the highest horizontal plane that intersects the ridge must cut it on both sides.
11 . Contour lines meeting at a point indicate a vertical cliff .
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3 Comments
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