Constructing Topographic Maps: A Practical Approach

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Study the rules for contour lines in Table 6-1 and the concepts in Figures 6-1 through 6-3. By applying the method illustrated in Figure 6-3, construct a topographic map on Figure 6-5. This figure depicts a landform near the sea (blank area at bottom of figure). Draw and label contours of 0, 40, 80, 120, 160, and 200 ft. Start with the lowest contour, and then construct progressively higher contours. Note that the first contour (0 ft) is simply the shoreline (label it with an elevation of “0”). (5pts) Figure 6-5: Topographic map exercise; contour interval = 40 ft.
Study the method for constructing a topographic profile in Figure 6-4. Using this approach, construct a topographic profile on Figure 6-6. Before completing the profile, …show more content…

Why? (2pts)

Answer:

A topographic profile is a side view of the land surface that can be constructed from a topographic map (Figure 6-4). Profiles are often exaggerated vertically to show more detail. For example, if the horizontal scale is 1 in = 1,000 ft and the vertical scale is 1 in = 250 ft, the vertical exaggeration would be 1,000/250 = 4.

An alternative to stereoscopes, anaglyphs provide a means to study contour maps and other imagery in three dimensions when viewed with color glasses. Images consist of two superimposed color layers, offset to produce a depth effect.

Topographic Map Exercises using anaglyph - Copy the following address to your web browser https://nagt.org/details/images/8512.html
Q6-12: Using color-coded glasses, examine the anaglyph of Crater Lake, Oregon. Describe the terrain of the area. (3pts)

Answer:

Q6-13: What geologic processes could have formed this landscape? What field evidence could you gather to test your hypothesis? (2pts)

Answer:

Q6-14: Where are relatively steep and flat parts of the area? How are these areas expressed (spacing) by contour lines?

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