Contour interval is the difference in elevation between two lines.
Explanation:
The contour lines are closed circular lines that connect places with the same elevation. In order for them to be more useful, the reader of the map needs to know certain information, such as the contour interval. The contour interval is basically representing the difference in elevation between two contour lines.
The contour interval can be found occasionally in the map's legend, but more often the reader of the map needs to figure it out on its own. That is actually very simple, as the reader only needs to see the values of two neighboring main contour lines, and than divide the difference between them in five, thus the distance between each contour line will be discovered. Some other elements of the contour lines are:
- main contour line
- half contour line
- quarter contour line
- small pointed interrupted lines
- numbers
- dots
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