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Aim: How do we read Topographic Maps? Do Now: In your notes, list all the different types of landforms/features of Earth that you can think of. Example: Hills. I. Vocabulary. 1) Topography : The shape of the land. Grand Canyon, Arizona. K2, Pakistan. Napa Valley, California. - PowerPoint PPT Presentation
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Aim: How do we read Topographic Maps?
Do Now: In your notes, list all the different types of landforms/features of Earth that you can think of.
Example: Hills
1) Topography:
The shape of the land.
K2, PakistanNapa Valley, California
Grand Canyon, Arizona
I. Vocabulary
2) Topographic Maps: • Represent the shape of the land on a
flat piece of paper.
• Isolines represent different elevations on a topographic map.
• Each isoline connects values that are equal.“iso” means equal
m
mm
mm
3) Altitude
The height above sea-level or above a specific point on a map.
What value is sea-level?
Get the Altitude worksheet from the back of the room. You and your partner should work on this worksheet together. We will go over it
in 10-15 min.
a) Index Contour Lines: darker lines that are labeled with their elevation.
Index contour lines
II. Parts of Topographic maps:
Using the index contour lines, determine the value of the lines in
between.
b) Contour Interval:• The measurement that separates
each contour line.• They are a vertical measurement.
c) Hachure marks: refer to a drop in elevation. Indicates a depression in the ground.
d) Bench mark: shows the exact elevation at that point.
Copy diagram into notes
Closer contour lines = steep slopes.
Further contour lines = gradual slopes.
e) Gradient• Refers to the steepness of the land (slope)
Which side of the hill is the steepest?
WHY?N
upstream
downstream
When a river or stream crosses a contour line, the contour line bends and points upstream.
F) River and Streams
• Upstream is where the river starts.
• Downstream is where the river ends.
G) The highest possible point on a contour map will always be one unit less than the next possible contour line.
Contour Interval = 10 m
X 10 m
What is the highest possible
value of X?
ClosureObtain the worksheet called “Reading a
Topographic Map” from the back table and complete the worksheet. We will go
over it when finished.