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Published byChad Bates Modified over 9 years ago
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Maps, Etc. What are they, why do we use them, and how do we use them
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Globes 3 dimensional representation of the Earth Advantages – exactly as it is, just smaller Disadvantages – not easily portable, since it is a sphere, we can only see half at a time
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Maps 2 Dimensional Representations of Earth, or just a portion Advantages: easily portable; can be drawn to any scale Disadvantages: DISTORTION – because you are trying to make a round thing flat
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Map Projections Projections help us overcome/reduce distortion Planar (azimuthal) Conical – shows pretty accurate shapes and sizes of landmasses, but distorts the edges [good for showing just one big land mass Cylindrical – Shows the entire Earth, and there are 3 types
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Types of Cylindrical Maps Mercator – shapes of continents are distorted at the poles (tops/bottoms), and compressed near equator Homolosine – accurate size and shape, but distances are wrong (interrupted) Robinson – entire earth, good shapes and sizes, but shape of land at the poles is flat (the one on the wall)
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Uses/Types of Maps General Reference – topographic Thematic – specific types of information shown, like climate or population Navigation – used by sailors and pilots
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Surveying This is what you do to gather the info you need to make a map It all was manual in the past, now we use satellites and airplanes
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Satellite Systems Landsat – series of satellites that update the entire Earth every 16 days GOES – Geostationary Operational Environment Satellite
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More Satellite and Map Stuff GIS – Geographic Informational System – this layers information on to a map GPS – Global Positioning System – uses 24 Nav Stars to tell you exactly where you are [latitude, longitude, elevation, time]
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