1 / 17

Office Hours

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:

mariko
Download Presentation

Office Hours

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 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/

  2. Lesson 9 Topographic Profiles Hess, McKnight’s Physical Geography, 10 ed. A3-A4

  3. What is a “topographic profile?” • 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

  4. Constructing a Topographic Profile • 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)

  5. 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.

  6. Example 1

  7. Example 1, cont.

  8. Example 1, cont.

  9. 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

  10. SnowvilleTopo • Let’s see how our hand-drawn profile compares to a computer-generated image. • http://www.geocontext.org/publ/2010/04/profiler/en/

  11. Vertical Exaggeration • 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

  12. Vertical Exaggeration, cont. • 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

  13. Vertical Exaggeration, con.t

  14. Vertical Exaggeration, cont. • 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

  15. Vertical Exaggeration, con.t • 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)

More Related