Maps, Etc. What are they, why do we use them, and how do we use them.

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    04-Jan-2016

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<p>Maps, Etc.</p> <p>Maps, Etc.What are they, why do we use them, and how do we use them</p> <p>Globes3 dimensional representation of the Earth</p> <p>Advantages exactly as it is, just smaller</p> <p>Disadvantages not easily portable, since it is a sphere, we can only see half at a time</p> <p>Maps</p> <p>2 Dimensional Representations of Earth, or just a portionAdvantages: easily portable; can be drawn to any scale Disadvantages: DISTORTION because you are trying to make a round thing flat</p> <p>Map ProjectionsProjections help us overcome/reduce distortion</p> <p>Planar (azimuthal) Conical shows pretty accurate shapes and sizes of landmasses, but distorts the edges [good for showing just one big land massCylindrical Shows the entire Earth, and there are 3 types</p> <p>Types of Cylindrical MapsMercator shapes of continents are distorted at the poles (tops/bottoms), and compressed near equatorHomolosine 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)</p> <p>Uses/Types of MapsGeneral Reference topographic</p> <p>Thematic specific types of information shown, like climate or population</p> <p>Navigation used by sailors and pilots</p> <p>SurveyingThis is what you do to gather the info you need to make a mapIt all was manual in the past, now we use satellites and airplanes</p> <p>Satellite SystemsLandsat series of satellites that update the entire Earth every 16 days</p> <p>GOES Geostationary Operational Environment Satellite</p> <p>More Satellite and Map StuffGIS Geographic Informational System this layers information on to a map</p> <p>GPS Global Positioning System uses 24 Nav Stars to tell you exactly where you are [latitude, longitude, elevation, time]</p>

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