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Class 1b: Introduction to maps
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What is a map? A two-dimensional representation of the spatial distribution of selected phenomena
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Why make maps?
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Latitude and longitude Latitude: how far north or south
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Latitude and longitude Longitude: how far east or west
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How do we read maps?
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Map scale Ratio of the distance on the map to the distance on the ground
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Map scale 1.Graphic:
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Map scale 2.Verbal: 1 inch equals 10 miles
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Map scale 3.Representative fraction or ratio: 1:24,000
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Map symbolization
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Point symbols Every symbol counts as one occurrence
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Line symbols One-dimensional
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Area symbols Each territory or region has one value
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Topographic maps
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Map projections Project a round globe onto a flat surface
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Map projections Three properties to consider
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Cylindrical projections Shapes are preserved, but not area
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Conic projections
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Planar projections
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Other projections
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