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Lesson 4–How to Read a Topographic Map

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Lesson 4–How to Read a Topographic Map Lesson 4–How to Read a Topographic Map Key teaching points Suggestions for teaching Ask students to answer these ques- this lesson (3, 35-minute sessions) tions and fill in their answers on A topographic map is a representa- Activity Sheet #4: tion of a three-dimensional surface on On the poster is a topographic map a flat piece of paper. The digital eleva- of Salt Lake City. This lesson will help Which is higher, hill A or hill B? tion model on the poster is helpful in students learn how to read that map. (Answer: hill B) understanding topographic maps. Learning to use a topographic map is a difficult skill, because it requires stu- Which is steeper, hill A or hill B? Contour lines, sometimes called "level dents to visualize a three-dimensional (Answer: hill B) lines," join points of equal elevation. surface from a flat piece of paper. The closer together the contour lines Students need both practice and imag- 3. Compare a topographic map to a picture of the same place. Now have appear on a topographic map, the ination to learn to visualize hills and steeper the slope (assuming constant valleys from the contour lines on a the students look at the topographic of the same two hills. Say, "The contour intervals). topographic map. map lines you see on this map are called contour lines. Can you see why they Topographic maps have a variety of A digital terrain model of Salt Lake City uses, from planning the best route for is shown on the poster. This three- are sometimes called `level lines'?" a hike to determining a location for a dimensional drawing, created from Ask the students to trace with their fin- school or an airport. computerized data, is a helpful transi- gers around the 40-foot contour line on tion step for students as they learn to the map. Then ask them to look at the How this lesson relates visualize the shape of the land from picture of the hill and draw their fingers to the geographic themes contour lines. around the 40-foot contour line. Location and place—Using a topo- 1. Discuss the word "topographic." Then ask the students to draw their fin- graphic map can give students a clear Remind students that there are many gers along the 20-foot contour line on understanding of the physical and different types of maps. Tell them that the topographic map. Then draw their manmade characteristics of a location. they are going to learn about a specific fingers along the 20-foot line on the picture of the hill. This exercise will The topographic map allows for a clear type of map—the topographic map. understanding of such physical fea- Begin the lesson by introducing stu- help those students who are kines- tures as mountains and canyons. dents to the word "topographic." Write thetic learners. the word on the board. Tell students Relationships within places—Using the the word is derived from two Greek Ask students to answer this ques- topographic map, students can see words—"topo," meaning "place," and tion and fill in the answer on why some things are where they are. "graphos," meaning "drawn or written." Activity Sheet #4: They can see how people have adapt- Ask students if they can use that infor- • How many feet of elevation are there ed to the physical characteristics of a mation to figure out what "topographic" between contour lines? particular location. might mean. Then ask a student to (Answer: 10 feet) look up the word in the dictionary to Movement—Students can begin to see whether the guess was correct. Show the students that some contour understand how the topography of a lines are thicker than others. These location influences the transportation 2. Hand out Activity Sheet #4. The top "index contours" include labels to and communication within that area illustration introduces students to con- make it easier to read elevations from and with the rest of the world. tour lines. Point out that a contour line the maps. joins points of equal elevation. Think of Materials you need it as an imaginary line on the ground Ask students to answer these ques- for this lesson that takes any path necessary to main- tions and fill in the answers on tain constant elevation. Activity Sheet #4: A copy of Activity Sheet #4 for each student. First, have the students look at the • How high is hill A? side view of the hills. (Bottom of the (Answer: about 42 feet) illustration) Hill B? (Answer: about 54 feet) • Are the contour lines closer together on hill A or hill B? (Answer: hill B) Lesson 4–page 2 Help students understand that the closer • Locate a stream that flows into the main • What is the approximate elevation of the the lines, the steeper the slope. Have stu- river. Draw a pencil line down that stream. State capitol? dents point out other places on the map Put an X where the stream joins the main (Answer: 4,500 feet) that have a very steep slope. river. On a real topographic map, streams are shown in blue and contour Would you be walking uphill or downhill to 4. Introduce students to other information lines are shown in brown. go from the State capitol to Pioneer Park? shown on a topographic map. Now have (Answer: downhill) the students look at the picture on page 2 5. Discuss how topographic maps are of the activity sheet. used. Maps are developed for special pur- • Suppose you lived by Fremont School. poses. Topographic maps are used in a Find at least three ways you could get Have students identify and circle these variety of ways. from your house to the State capitol. List features on the illustration 2 of Activity things you would see along the way. Sheet #4: How might you use a topographic map if you were selecting: Additional activities for follow- • A church up • A route for a hike. • A bridge over the river (Choose route that's not too steep. When The topographic map shows that planning a long hike, you may want to see Salt Lake City has a Pony Express • An oceanside cliff whether water is available or whether it Monument near the State capitol. should be carried in. Woods tint may indi- Have your students learn more about the • A stream that flows into the main river cate whether the route is shaded.) Pony Express and why this monument is located in Salt Lake City. • A hill that rises steeply on one side and • The best location for an airport. more smoothly on the other. (Make sure airplanes have plenty of room to take off and land before the ground Have students identify and circle the rises. Do not let students suggest building Return to "What Do Maps Show" Home same features on illustration 3 of in a swamp, in the woods, or in a built-up Page Activity Sheet #4. area.) • Draw the map symbol for a church. • A route for a new road. (Find a shallow grade rather than a steep one. Do not allow them to cross too many rivers because bridges are expensive.) • Draw the map symbol for a bridge. 6 .Working with the topographic map in the map packet. Now that your students have a basic understanding of how topo- • Put an X on the oceanside cliff. graphic maps work, here are some ques- tions to ask them about the topographic • What is the elevation of the contour line map in their map packet: at the top of the cliff? (Answer: 100 feet) Activity Sheet #4–How to Read a Topographic Map One special kind of map is called a topographic map. It has contour lines to show the shape and elevation of the land. They are sometimes called "level lines" because they show points that are at the same level. Here's how contour lines work: The top of this drawing is a con- tour map showing the hills that are illustrated at the bottom. On this map, the vertical dis- tance between each contour line is 10 feet. 1. Which is higher, hill A or hill B? 2. Which is steeper, hill A or hill B? 3. How many feet of elevation are there between contour lines? 4. How high is hill A? Hill B? 5. Are the contour lines closer together on hill A or hill B? Activity Sheet #4, page 2 Look at this picture. It shows a river valley and several nearby hills. On the illustration, locate the following things: •A church •A bridge over the river •An oceanside cliff •A stream that flows into the main river •A hill that rises steeply on one side and more smoothly on the other. Here is a topographic map of the same place. Find the items you located on the illustration on the topograhic map. Circle the symbol for a church. Draw a church symbol here. Put a square around the map symbol for a bridge. Draw a bridge symbol here. Put an X on the oceanside cliff. What is the elevation of the contour line at the top of that cliff? Locate a stream that flows into the main river. Draw a pencil line down that stream. Put an X where the stream joins the main river. On a real topographic map, streams are shown in blue and contour lines are shown in brown. Activity Sheet #4, page 3 Find the hill that rises steeply on one side and more smoothly on the other. On the topogrpahic map, draw a path up the gentler slope of the hill to the highest point.
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