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MS. PATTEN 2010
Maps, Projection and Scale
What is a map?
a graphic representation of the real world
Title Orientation Date Author Legend Scale Grid
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
Reference Maps: West Virginia Counties
Reference Maps: Minnesota Roads
Reference Maps: South American Countries
Reference Maps: Topographic Map
Thematic Map: Dot Map
Thematic Map: Choropleth Map
Thematic Map: Proportional Symbol
Thematic Map: Isarithmic Map
Thematic Map: Cartogram
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.
Types of Scale
Graphic
Types of Scale
Verbal 1 Map Unit = x Land Units 1 inch = 63,360 inches 1 inch = 1 mile
Types of Scale
Representative Fraction 1 : 24,000 1:250,000 1/50,000
Large Scale vs Small Scale