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# Office Hours - PowerPoint PPT Presentation

Office Hours. Tue: 12:30 PM to 2:30 PM Wed: 9:00 AM to 10:30 AM & 12:00 PM to 2:00 PM Thr : 9:00 AM to 10:30 AM Course Syllabus can be found at: http://www.wx4sno.com/portfolio/BSU/Fall_2011 / This lecture will be posted AFTER class at:

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### Office Hours

Tue: 12:30 PM to 2:30 PM

Wed: 9:00 AM to 10:30 AM & 12:00 PM to 2:00 PM

Thr: 9:00 AM to 10:30 AM

Course Syllabus can be found at:

http://www.wx4sno.com/portfolio/BSU/Fall_2011/

This lecture will be posted AFTER class at:

http://www.wx4sno.com/portfolio/BSU/Fall_2011/Lectures/

### Lesson 9

Topographic Profiles

Hess, McKnight’s Physical Geography, 10 ed.

A3-A4

• Last week we discussed USGS topographic maps

• 3D landscape on a 2D map

• Use contour lines to connect equal elevation intervals

• This is known as a “plain view” map

• A topographic profile is literally a “side view” along a line drawn over the topographic map

• They show changes in elevation along a line

• On the topographic map, determine what profile you would like to measure

• For this exercise & the homework, this is given as the line segment AB

• If a computer program is not available, lay a piece of paper down along line AB

• Start from point A: wherever a contour line intersects the edge of the paper, place a short tick mark AND write down the elevation

• Continue along the line to point B

• Along the way, mark wherever a mountain peak, valley, or stream is located

• Also mark any other important features (roads, buildings, etc)

Constructing a Topographic Profile, cont.

• Next, transfer your paper with the tick marks, elevation, and features to a chart (will be provided)

• Align your writing along the bottom of the chart

• Start at point A: transfer your measurements along the X and Y-axis’ moving toward point B.

• Connect the dots

• Finish by adding the locations of mountain peaks, streams, roads ,etc.

SnowvilleTopo

• Using the Snowville topographic map from last week, construct a profile along line AB.

• You may use your printout, or come up to the screen

• The elevation at point A is 2093

• The elevation at point B is 2085

• Remember to draw both contour lines as “tick marks” AND important features

• Once you are done, raise your hand and I will check your work

SnowvilleTopo

• Let’s see how our hand-drawn profile compares to a computer-generated image.

• http://www.geocontext.org/publ/2010/04/profiler/en/

• In our previous example, the y-axis intervals were the same as the elevation contours on the Snowville topographic map

• In our case, the vertical scale we used matched the horizontal scale

• The vertical scale was equal to the graphic scale which was given in the lower-left corner

• This brings us to vertical exaggeration

• Vertical exaggeration is created to emphasizes differences in elevation and to show relief

• e.g., when there is a large amount of V. E., small hills appear to be tall mountain peaks on the graph

• To determine the amount of V. E., simply divide the horizontal distance (i.e., the denominator of the fraction/ratio) by the vertical distance 1” represents on the graph

• For the Snowville topographic profile:

• The scale of the topographic map was

½” = ~500’

• Converting this and you have 1” = ~1000’

• The vertical distance on the graph was

• 1” = ~1000’

• Divide the horizontal (scale) distance by the vertical distance:

• = 1.0

• Thus the V. E. is 1.0 X (or the same as the horizontal distance)