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5 sty 2019 · A contour line (also isoline, isopleth, or isarithm) is a line on a map joining points of equal height or depth above or below a level, usually mean sea level. It is often just called a “contour”. Each contour is a closed curve (Veregin 1999, 2000; Cheung and Shi 2004).
When you have a closed contour like the one below, this means there is a hill/mountain or depression. You don’t really know unless there is a label on the contour line. In the example below, we’ve added labels and it should be clear that it’s a depression.
22 cze 2024 · To represent a depression in the landscape, contour lines are drawn in concentric circles, similar to increasing elevation. The main difference is that the contour lines for depressions have arrows facing inward, indicating the direction towards the bottom of the depression.
23 cze 2024 · Contour lines that form closed curves usually indicate hills or mountains, but they can also indicate depressions. Generally, contours that are close together indicate steep slopes, while contour lines that are far apart indicate flatter terrain.
25 cze 2024 · On a topographic map, a depression is depicted by a series of closed contours concentric with the inner contours having a lower elevation than their outer surroundings. These contour lines have small tick marks or scratches pointing towards the lower elevation.
Every contour line forms a closed polygon, even if its full extents are not shown within the boundary of your drawing or survey: contour lines always form closed lines, even if it is not shown within the extents of your drawing (adapted from Strom, 2013)
(8) A closed contour line on a map represents either depression or hill. A set of ring contours with higher values inside depicts a hill (Fig. 3.2a), whereas the lower value inside depicts a depression (without an outlet) (Fig. 3.2b).
