Goals Define and describe topographic maps Define and describe an elevation profile Use a topographic map to create an elevation profile Describe how NASA probes create topographic maps that are used to create elevation profiles ID: 511298
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Slide1
Topographic MappingSlide2
Goals
Define and describe topographic maps.
Define and describe an elevation profile.
Use a topographic map to create an elevation profile.
Describe how NASA probes create topographic maps that are used to create elevation profiles.Slide3
Describe a topographical map.
What do the lines on the topographical map represent?
How are the numbers used on the topographical map?
What do you know about this geological feature based on the map?
When might you use a
topo
map?Slide4Slide5
Topographical Maps
Topographical, or
topo
, maps show changes in elevation with lines.
To make a
topo
map, the elevation of the land is measured at regular intervals. Intervals with the same elevation are connected with lines to show that they are at the same elevation.Slide6
Part 2: Comparing
topo
maps to elevation profiles:
Which
topo
map matches each elevation profile? How do you know?
How do
topo
maps show changes in elevation?
What is the significance of the distance between lines on a topographical map?Slide7
Challenge: Use elevation information to create a
topo
map.
Good luck.
Hint: Topographical maps have a set contour or elevation interval. All values that fall between this interval fall between these lines. This means that you don’t need a contour line passing through every elevation point.Slide8
ActivitySlide9
Elevation profiles and negative integers
When we measure elevation, where do we measure from? What is ‘0’ on Earth?
The ocean has depths well over 2 miles. Should we measure everything from the lowest point on Earth? If not, where does it make sense to start measuring from?Slide10
Key questions for the next slide…
If sea level is 0, how do we write a number that is below sea level?
If we are measuring a distance from and elevation below sea level to an elevation above sea level, how do we write an equation to find the difference?Slide11
The concept of absolute value/negatives and elevation profiles
The highest point in the United States is the summit of Mount McKinley (Denali) in Alaska.
This mountain is 20,320 feet above sea level.
The lowest point in the United States is in Death Valley California.
Here, it is 282 feet below sea level.
What is the difference in elevation between the summit of McKinley and Death Valley?