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
3-D visualization (ups and downs)

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

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

5. Hachures
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
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)
4- Contour lines form v’s that point upstream when they cross streams
5- Contour lines are closely spaced in steep areas, and far apart in flat areas