Why Maps Can you use a square globe? Could you fold up a globe and put it in your pocket? Why do we...
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Transcript of Why Maps Can you use a square globe? Could you fold up a globe and put it in your pocket? Why do we...
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Why Maps
Can you use a square globe?Could you fold up a globe and put it in your pocket?Why do we need maps?What types are there?
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Map MakersCartography: map makingDevelop a way to put a curved surface onto a flat surface (Map Projection)MercatorGnomonicConicAre the most common projections
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Map Projections
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Mercator Projection
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Mercator ProjectionWrap a cylinder around a globe.Meridians appear straight. This creates distortion near the poles where the meridians normally come together.
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Mercator ProjectionCompass directions appear as straight linesLatitude & Longitude are shown clearly and easily measured with a ruler.Shapes are shown correctly.
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Gnomonic Projection
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Gnomonic ProjectionImagine a sheet of paper touching a globe at one point (tangent)Little distortion occurs at the point of contact. It is usually the poles.
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Gnomonic ProjectionThere is a great distortion in both directions from the point of contact.Used in navigation of great circle routesGreat circle appears as a straight line on these maps.
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Conic Projections
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Conic ProjectionCone placed over a globe so that the axis of the cone is aligned with the axis of the globe.Cone touches the globe along one parallel.
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Conic ProjectionThe area near the contacted latitude has the least distortion.Good for studying a specific area.
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Polyconic ProjectionPlacing many conic map projections together can give you a continuous map.The relative shape and size of small areas are the same as the globe.