1. A Different Kind of Topography:

3. Question of the Day
Question: What’s the difference between latitude and longitude? Answer: … … …
Turn In:
Coastal Upwelling
Current Event Article, Summary, & Evaluation
CYU’s 1, 5, 6
Review Sheet (any 11 done so far)

4. Topographic Maps

5. Contour Mapping
Topographic maps, also called contour maps, topo maps, or topo quads, are maps that show topography, or land contours, by means of contour lines.

6. Contour Lines
Contour lines are curves that connect contiguous points of the same altitude.

7. Mt. Ginger
Mt. Riddle
Mt. Tipster

8. How Steep is the Slope?
Where the slopes are steeper, the contour lines are closer together!
Where the slopes are gentler, the contours lines are further apart!

9. Contour Interval
difference in altitude between two adjacent contour lines
Helps determine differences in elevation between two points
Usually given at the bottom of the map.
consistent throughout a map (in most cases)

10. What is Relief?
Relief is the difference in elevation between the highest and lowest points in a region!

11. Rules of Contour Mapping
1. Every point on a given contour line is of the exact same elevation; that is, contour lines connect points of equal elevation.

12. Rules of Contour Mapping
2. Contour lines always close to form an irregular circle
sometimes part of a contour line extends beyond the mapped area, so that you cannot see the entire line.

13. Rules of Contour Mapping
3. Contour lines never split.
4. Evenly-spaced contour lines represent a uniform slope. Closely spaced contour lines indicate a steep slope.

14. Cliffs or Sharps Drop Offs
(Where the slopes are steeper, the contour
lines are closer together!)

15. 5. A concentric series of closed contours (like a target or bullseye) represents a hill.
Hachure marks
6. Depression contours have hachure marks on the downhill side and represent a closed depression (hole).

16. Depression Contours

17. When Contour Lines Cross Rivers
7. Contour lines form a V pattern when crossing rivers or streams.
The apex (point) of the V always points upstream (uphill) and the river flows the opposite way

18. 8. In cases where slope orientation changes (like on top of a hill or in a valley), contour lines of equal elevation will be repeated.