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Topographic Maps Obj- 7. Describe how contour lines and contour intervals are used to show elevation on topographic maps 8. List the 5 rules of topographic.

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Presentation on theme: "Topographic Maps Obj- 7. Describe how contour lines and contour intervals are used to show elevation on topographic maps 8. List the 5 rules of topographic."— Presentation transcript:

1 Topographic Maps Obj- 7. Describe how contour lines and contour intervals are used to show elevation on topographic maps 8. List the 5 rules of topographic maps

2 What do Topographic Maps Do? Indicate relief of an area Indicate relief of an area 3-D visualization (ups and downs) 3-D visualization (ups and downs)

3 Contours Show elevation above sea level Show elevation above sea level Connect points of equal elevation Connect points of equal elevation Indicate change in vertical distance Indicate change in vertical distance

4 Contour Interval The change in elevation between adjacent contour lines The change in elevation between adjacent contour lines Index contours are the lines that are numbered Index contours are the lines that are numbered Large contour interval- Steep relief (hills mountains) Large contour interval- Steep relief (hills mountains) Small intervals-Gentle relief Small intervals-Gentle relief

5 Hachures Short lines at right angles to contour lines used to show depressions Short lines at right angles to contour lines used to show depressions

6 5 Rules of Topographic Maps 1 Contour lines connect points of equal elevation 1 Contour lines connect points of equal elevation 2 Contour lines never cross or join contour lines of different elevation 2 Contour lines never cross or join contour lines of different elevation

7 5 Rules of Topographic Maps 3- Contour lines close or join around hills, depressions, or basins. (If not they extend to the edge of the map) 3- Contour lines close or join around hills, depressions, or basins. (If not they extend to the edge of the map) 4- Contour lines form vs that point upstream when they cross streams 4- Contour lines form vs that point upstream when they cross streams 5- Contour lines are closely spaced in steep areas, and far apart in flat areas 5- Contour lines are closely spaced in steep areas, and far apart in flat areas

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