RULES of Contour Mapping - PowerPoint PPT Presentation

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RULES of Contour Mapping

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  1. RULES of Contour Mapping

  2. 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

  3. #1. A contour line represents a single equal elevation. • All points on the same contour line have the same elevation. C D A B

  4. Commonly, every 5th line is darker and the elevation shown. This is the index contour.

  5. #2. Where one closed contour line surrounds another, the inner contour line represents the higher elevation.

  6. This is a contour map of a mountain.

  7. #3. Elevation is determined by the contour line interval. Question: What is the contour line interval here?

  8. #4.Closely spaced contour lines =steep slope.Widely spaced contour lines =gentleslope.

  9. #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

  10. In what direction is the river flowing?

  11. #6. Depressions are shown using hachure contour lines

  12. The hachures point into the depression. (Hachures = short dashes)

  13. 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