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Reading a
Topographic Map
What are topographic maps used
for?
Topographic Maps:
• Show surface features of the Earth such as
mountains, valleys, craters, lakes, etc
• Show elevation (h...
A picture of elevation:
Sea Level
How to Read a Topographic Map:
Contour Line:
• Connect points of equal
elevation
• Each line represents a
change in elevat...
Contour Interval:
• The amount of elevation between 2 contour
lines.
Example:
If the contour
interval on this
map is 10 fe...
Relief:
The difference between the highest and lowest
point on the map.
What is the relief
on this map?
(Remember the
cont...
Index Contour:
Darker, heavier lines – usually about every 5-
10 lines. These are often the only lines
labeled
Golden Rules of Reading
Topographic Maps:
1. Contour lines NEVER cross
2. All points on one contour line
represent one ele...
5. Contour lines that cross a valley or
stream are v-shaped
a.The v points to higher elevation
b.The v points upstream
Exa...
6. Contour lines form closed circles
around hills, mountains, and
depressions
7. Depressions are marked with short
straight lines inside the circle
Example:
You Try It…
Draw a topographic map for a “pretend
landscape” that has a relief of 200 ft, 2
hills, 1 depression, a river, ...
Reading a topographic map
Reading a topographic map
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Reading a topographic map

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Transcript of "Reading a topographic map"

  1. 1. Reading a Topographic Map
  2. 2. What are topographic maps used for?
  3. 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. 4. A picture of elevation: Sea Level
  5. 5. How to Read a Topographic Map: Contour Line: • Connect points of equal elevation • Each line represents a change in elevation
  6. 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. 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. 8. Index Contour: Darker, heavier lines – usually about every 5- 10 lines. These are often the only lines labeled
  9. 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. 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. 11. 6. Contour lines form closed circles around hills, mountains, and depressions
  12. 12. 7. Depressions are marked with short straight lines inside the circle Example:
  13. 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.
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