Your SlideShare is downloading. ×
Reading a topographic map
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×

Saving this for later?

Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime - even offline.

Text the download link to your phone

Standard text messaging rates apply

Reading a topographic map

4,235
views

Published on


0 Comments
2 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
4,235
On Slideshare
0
From Embeds
0
Number of Embeds
3
Actions
Shares
0
Downloads
181
Comments
0
Likes
2
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. Reading a Topographic Map
  • 2. What are topographic maps used for?
  • 3. Topographic Maps: • Show surface features of the Earth such as mountains, valleys, craters, lakes, etc • Show elevation (height above or below sea level)
  • 4. A picture of elevation: Sea Level
  • 5. How to Read a Topographic Map: Contour Line: • Connect points of equal elevation • Each line represents a change in elevation
  • 6. Contour Interval: • The amount of elevation between 2 contour lines. Example: If the contour interval on this map is 10 feet, what is the elevation of “A”?
  • 7. Relief: The difference between the highest and lowest point on the map. What is the relief on this map? (Remember the contour interval is 10 feet)
  • 8. Index Contour: Darker, heavier lines – usually about every 5- 10 lines. These are often the only lines labeled
  • 9. Golden Rules of Reading Topographic Maps: 1. Contour lines NEVER cross 2. All points on one contour line represent one elevation 3. Closely spaced contour lines mean steep slope 4. Contour lines that are far apart mean gentle slop or flat land
  • 10. 5. Contour lines that cross a valley or stream are v-shaped a.The v points to higher elevation b.The v points upstream Example:
  • 11. 6. Contour lines form closed circles around hills, mountains, and depressions
  • 12. 7. Depressions are marked with short straight lines inside the circle Example:
  • 13. You Try It… Draw a topographic map for a “pretend landscape” that has a relief of 200 ft, 2 hills, 1 depression, a river, a city, and some wooded areas. Use a contour interval of 20 ft.