RULES of Contour Mapping

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## RULES of Contour Mapping

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**RULES of**Contour Mapping**TOPOGRAPHY**• The study of the shapes and features of the Earth’s surface. TOPOGRAPHIC MAPS • Map showing 3-dimensional shape and elevation of land in 2-dimensions ELEVATION • Height above sea level**#1. A contour line represents**a single equal elevation. • All points on the same contour line have the same elevation. C D A B**Commonly, every 5th line**is darker and the elevation shown. This is the index contour.**#2. Where one closed contour line surrounds another,**the inner contour line represents the higher elevation.**#3. Elevation is determined by the contour line interval.**Question: What is the contour line interval here?**#4.Closely spaced contour lines =steep slope.Widely spaced**contour lines =gentleslope.**#5. Where a contour line crosses a stream or river, the**contour line bends to form a “V” that points upstream.This is called the Rule of V’s**The hachures point into the depression. (Hachures =**short dashes)**Contour**Elevation Repeats A hachured contour line, lying between two different contour lines, is the same elevation as the lower contour line. Count up Count down