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# Chapter 6 Section 3 (maps)

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Chapter 6: Views of Earth
Section 3: Mapping Earth

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• ### Transcript of "Chapter 6 Section 3 (maps)"

1. 1. Chapter 6: Views of EarthSection 3: Maps<br />Mr. MotukGeneral Science<br />
2. 2. How are Maps Used?<br />Maps are used to model the Earth’s Surface. <br />Maps are made using projections. <br />Making a map of the Earth is difficult because you are placing a round sphere on flat paper. <br />All maps have some type of distortion. <br />Either distorted shape or distorted area. <br />
3. 3. Types of Map Projections<br />Mercator Projection<br />Represents continental shapes correctly. <br />Areas of distortion: Polar regions get stretched out.<br />Forms a grid of parallel lines of latitude and longitude. <br />Mainly used for navigation. <br />Airplanes and Boats.<br />
4. 4. Robinson Projection:<br />Accurate continental shapes and areas. <br />Distorts Polar region only. <br />Displays Earth as a flat top and bottom oval. <br />
5. 5. Conic Projection:<br />Used to project maps of small areas. <br />Mainly used for Roads and Weather maps. <br />Produced by projecting latitude and longitude onto a cone. <br />Distorts latitudinal lines. (They arc)<br />
6. 6. Topographic Maps<br />Map showing detailed elevations for an area. <br />Project height onto a flat page using contour lines. <br />Contour lines: connect different areas of equal elevation. <br />Contour interval: difference between contour lines. <br />Index contours: lines marked with an elevation. <br />
7. 7. Using Contour Maps<br />Contour lines never cross!!!!<br />Contour lines close around hills, basins, or depressions. <br />Contour lines form V’s that point upstream. <br />A MAP LEGEND tells common symbols. <br />A MAP SCALE tells ratios for determining distance. <br />
8. 8. TYPICAL MAP LEGEND<br />
9. 9. TOPOGRAPHIC MAP: HARRISBURG <br />
10. 10. Landsat Satellites<br />Detect different wavelengths of energy reflected or emitted. <br />Use mirrors with detectors to measure intensity. <br />Produce digital image of surface features.<br />Examples: Landsat Image from NASA<br />
11. 11.
12. 12. Topex Poseidon Satellites<br />Topex= Topographical Experiment<br />Uses RADAR to detect underwater ocean features. <br />Develop maps of the ocean floor. <br />Uses remote sensing under water. <br />a. “Sea Beam” uses sonar to map the ocean floor.<br />
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