Topographic Maps. Take Notes as you view the slides
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1 Topographic Maps Take Notes as you view the slides
2 Lesson Objectives Define a topographic map and state its uses. Describe how contour lines show the elevations, shape, and slope of the land. Identify the 3 types of scale and how it is represented on a map. Identify the meanings of some symbols and colors used on topographic maps.
3 Key Words Topographic Map Contour Interval Bench Mark Contour Lines Index Contours Map Scale
4 What is a topographic map? Topographic Maps are representations of the real world, complete with hills and valleys, all presented on a flat surface (i.e. paper). The next slide is a topographic map of Owingsville along with an aerial image of the town:
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6 What is a topographic map? The most important feature of a topography map (aka topo maps ) is that it shows the elevation (or height) of the land using contour lines. Essentially, it is a map that shows how high and low the ground is in relation to sea level.
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8 What are contour lines? Contour lines are lines that connect points that are of the same elevation. They show the exact elevation, the shape of the land, and the steepness of the land s slope. Contour lines never touch or cross always a rough circle
9 What is a contour interval? A contour interval is the difference in elevation between two contour lines that are side by side. Remember that a contour interval is not the distance between the two lines to get the distance you need to use the map scale.
10 Reading a topographic map- Slope Closely spaced contour lines represent steep slopes. Widely spaced contour lines represent gentle slopes.
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12 Index Contours Index Contours are the bold contour lines which are labeled with an elevation. Index contours occur every fifth contour line Red arrow indicate location of index contours.
13 Index Contours Question: What in the contour interval of the map below? Answer: 20 meters
14 More on Contour Lines Contour lines form V s that point upstream when they cross a stream. It is important to remember that they point in the opposite direction as the flow of water.
15 What is a benchmark? A benchmark is a place where exact elevation is known. It is useful in determining contour lines. Shown by a B.M. on map Ex: BM 60
16 Map Colours Topo Maps use five basic colors to indicate various features: green, white, blue, black, and brown. Green indicates heavy vegetation areas covered by forests, woods, jungles, etc. White indicates areas that are mostly clear of trees fields, plains, sand flats, etc. Blue indicates bodies of water lakes, rivers, streams, swamps. Black indicates human-made features, including roads, trails, buildings, bridges, railroads, airports, etc. (NOTE: Principle roads are often shown in red or red and white also.) Brown is used for contour lines
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18 Now that I know what a topographic map is, how do I read it? First determine the contour interval (the distance between each contour line). Then determine the map scale. (usually at the bottom of the map) Identify any hills or depressions. Use the legend to identify humanmade features.
19 Reading a topographic map cont. Look for areas where the contour lines are close together they indicate a steep area. Look for areas where the contour lines are spread apart they indicate a gentle slope.
20 Other Topographic Terms Legend explains symbols used on the map. Map scale compares distances on the map with distances on earth.
21 Map Scale To create an accurate picture of a landscape on paper everything has to be made much, much smaller. This is done by scaling down the actual size of the land so that it fits on a piece of paper.
22 Map Scale Definition: Map scales indicate how much area a map covers. The scale represents the ratio of a distance on the map to the actual distance on the ground
23 Map Scale Scale is expressed as a fraction or ratio, such as 1:24,000 (i.e. 1 unit on the map equals 24,000 units on the ground). The larger the second part of the number is, the more area is covered.
24 Three Scale Types: How scale is shown on a map 1) Ratio or Fractional Scale: - is a fixed ratio between linear measurements on the map and corresponding distances on the ground. Examples: 1:25 000, 1: ) Graphical scale: - is simply a line or bar drawn on the map that is divided into units that represent ground distances. Example: 3) Verbal/written scale: - is a convenient way of stating the relationship of map distance to ground distance. Examples: 1 cm equals 1 km, 1 cm = 10 km
25 Ratio Scale Maps with smaller scales generally show more detail. For example: a map with a scale of 1: will show more detail than a map of 1:
26 Ratio Scale On a map with a scale of 1: , 1 cm on the map equals cm on the ground. Question: 1 cm equals how many km on the ground? Step 1: How many cm in a km? cm in 1 km cm cm = cm = 1.25 km on the ground
27 Graphical Scale (Bar or Line Scale) For a later date
28 Scale Decreasing Detail Increasing Coverage 1:24,000 scale 1:100,000 scale 1:125,000 scale
29 Review Questions How are contour lines drawn on maps? How does a contour map show whether a slope is gentle or steep? What are index contours? What is a benchmark? How is a benchmark shown on a map? How is distance measured on a contour map? What are the three different map scales? Find the number of km on the ground that a map represents with a ratio scale of 1:
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