2. How Do We Construct a Topographic profile? Objective: To accurately construct a profile along any two points on a contour map.

3. 2 1 3 04km ocean C.I. = 10m X Y. River Nile DO NOW: Draw a side view along points XY of the surface feature shown in the map.

4. 2 130 4km ocean River Nile C.I. = 10m X Y.. Step 1: Number all contour lines above the line XY.

5. 2 130 4km ocean River Nile C.I. = 10m 26.5m X Y.. 20 40 30 10 Step 2: Draw a horizontal grid that represent the distance XY. (done for you) YX 0 30 40 10 20 50

6. 2 130 4km ocean River Nile C.I. = 10m X Y.. 20 40 30 10 YX 0 30 40 10 20 50 Step 3: Transfer the points where the contour lines cross the points XY from the contour map to a paper. Piece of paper

7. 2 130 4km ocean River Nile C.I. = 10m X Y.. 20 40 30 10 YX 0 30 40 10 20 50 20 30 10 30 40 10 40 20 Step 3: Transfer the points where the contour lines cross the points XY from the contour map to a paper.

8. 2 130 4km ocean River Nile C.I. = 10m X Y.. 20 40 30 10 YX 0 30 40 10 20 50 Step 4: Transfer the points from the paper to the bottom of the grid.. 20 30 10 30 40 10 40 20

9. 2 130 4km ocean River Nile C.I. = 10m X Y.. 20 40 30 10 YX 0 30 40 10 20 50 10 20 10 30 40 20 Step 4: Transfer the points from the paper to the bottom of the grid..

10. 2 130 4km ocean River Nile C.I. = 10m X Y.. 20 40 30 10 YX 0 30 40 10 20 50 10 20 10 30 40 20 Step 5: Mark off the corresponding elevation for each points on the grid and connect the points with a smooth curved line. That is what a map profile looks like.

11. YX 0 30 40 10 20 50 10 20 10 30 40 20 This is what a topographic profile looks like. Profiles are never shaded in but the next slide is shaded to give a more dramatic effect of the topography.

12. 2 130 4km ocean River Nile C.I. = 10m X Y.. 20 40 30 10 YX 0 30 40 10 20 50 10 20 10 30 40 20

13. 2 130 4km ocean River Nile C.I. = 10m X Y.. Y X 0 NAME: ______________________DATE: _________