GEO109_SCI210_Lab 8 Contour Maps SP23

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University of Dayton *

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109

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Geography

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Apr 3, 2024

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GEO 109L – Earth, Environment, & Society Lab SCI 210L – The Dynamic Earth Lab Lab Exercise 8 - Topographic/Contour Maps Introduction In this lab you will be using topographic maps to help visualize features on the Earth's surface. This lab will help you become familiar with general topographic map features and symbols along with how contour lines help represent the elevation changes and shapes of geologic features. In addition, we will compare this to using Google Earth, including overlaying topographic maps in Google Earth. Part 1 – General Contour Map Questions – use Figure 1 (see last page – instructor will provide printed copy to draw on) 1. Index contour lines are shown on topographic maps as bold brown lines with an associated number, or value. Find the three index contour lines in Figure 1 and list the value associated with each (for a total of three values). Values are in feet. Answer in this column of the table… 2 . Based on the index contour lines, what is the contour interval for this map? 3. What is the relief (difference in elevation) between points A and B? Show your work, including the elevation you determined for A and B 4. Of the four slopes shown with red arrows and labeled 1 – 4, which is the steepest? Explain why. 5. Hills are represented on topographic maps as a series of roughly circular, closed contour lines. Which of the landforms labeled A – F are hills? Lab 8 | 1 NAME: ____________________Table # _____

6. Depressions of the land surface are basins without outlets. When contours go back down inside a hill, they are marked with small hatchures, or cross lines, to denote a depression. Which of the landforms labeled A – F represent a depression? Review the USGS Topographic Map Symbols guide to see an example of this symbol. Answer in this column of the table… 7. When contour lines cross a stream, they form a V, which points upstream. Draw arrows on the three streams of Figure 1 that point in the direction of stream flow. Elevation can also be used as a clue to stream flow direction 8. To determine the elevation of a point that does not fall directly on a contour line, estimate the value between the two bordering contour lines. What is the approximate elevation for point N? Part 2 – General Contour Map Questions – – use Figure 2 (see last page, or printout provided in lab) Draw contour lines on Figure 2 to create a topographic map. Watch the example videos in Isidore Resources for how to draw contour lines. 9. Draw contour lines using a contour interval of 20 feet. Use the100 foot index contour line as your starting point and draw in the remaining contour lines that increase and decrease from that line. Tips:  Use the index contour line as your guide. All other contour lines should roughly match its shape.  Contour lines of different elevations should never cross  Not every number will have a line drawn through it. Only those with the exact value of that line.  A line might “go off the page” and then come back again at the edges of the map  When a line crosses a stream it makes a V that points upstream. 10. After you complete the contour lines, draw an arrow for each stream on the map to indicate which way they are flowing. Only one or two arrows is needed per stream. 2

Part 3 – University of Dayton Area – Dayton South Topo Map – pdf/hard copy Download the Dayton South Topo Map from Isidore to answer the first several questions, You will also use a close up, annotated screen shot of the section of the map where UD is located (upper part of the map). 11. Using the legend on the pdf map, what is the contour interval of this map? Answer here… 12. Using the legend on the pdf map, what is the fractional scale of this map? Use the annotated screenshot of the map that includes the University of Dayton (see below) to answer the questions next set of questions. 13. Which blue line crosses an area that has the steeper slope – B (Woodland Cemetery) or A (route up to Stuart Hall)? Explain your answer. Answer here… Lab 8 | 3

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