1. Turn in lab 4 Please put your name, lab section, and perm number on your answer sheet.

2. Lab 5: Terrain Representation Yingjie Hu

3. Objectives Learn how terrain can be represented on maps and in digital forms. Learn how to read contour lines, plot a cross- section, compute slope, and understand vertical exaggeration.

4. Contour line Contour line: The oldest but very effective way to represent terrain on maps. How to read contour line?

5. Contour line

6. Profile A cross section of a sample of topography

7. Profile

8. Relief Highest minus the lowest elevation on a section of terrain.

9. Slope θ Degree Slope Tan θ = rise/run = 3/30 Θ = arctangent (3/30) Θ = 5.71 degrees Percent Slope (Rise/run) * 100 3/30 * 100 = 10%

10. Slope A B

11. Vertical Exaggeration = (horizontal scale )/(vertical scale) If the vertical scale is 1"=1000’ and the horizontal scale is 1"=2000’, the vertical exaggeration is 2x (2000’/1000’).

12. Vertical Exaggeration

13. Assignment Finish lab 5. Due date: Next Thursday (Nov. 10th)