Download - Maps, projection and scale 2012
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MS. PATTEN 2010
Maps, Projection and Scale
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What is a map?
a graphic representation of the real world
Title Orientation Date Author Legend Scale Grid
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What are the two main types of maps?
Reference Maps show the locations
of a variety of features
CountiesRoadsCountriesTopographic
Thematic Maps emphasize a
particular theme or special topic
Dot MapChoroplethProportional
SymbolIsorithmicCartogram
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Reference Maps: West Virginia Counties
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Reference Maps: Minnesota Roads
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Reference Maps: South American Countries
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Reference Maps: Topographic Map
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Thematic Map: Dot Map
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Thematic Map: Choropleth Map
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Thematic Map: Proportional Symbol
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Thematic Map: Isarithmic Map
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Thematic Map: Cartogram
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What is scale?
Ratio of the distance between two points found on a map compared to the actual distance between these points in the real world.
All map scales are an expression of the numerical relationship between the MAP and the LAND that is represented. The MAP unit is always mentioned first.
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Types of Scale
Graphic
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Types of Scale
Verbal 1 Map Unit = x Land Units 1 inch = 63,360 inches 1 inch = 1 mile
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Types of Scale
Representative Fraction 1 : 24,000 1:250,000 1/50,000
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Large Scale vs Small Scale