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Effective Communication through Thematic Cartographic Maps

Learn about the types of maps - Reference Maps and Thematic Maps - and their uses. Explore Graduated Circle, Dot, Isometric, Choropleth, and Cartogram maps. Discover how to perceive the preferences of Pennsylvanian and Californian students in map form. Understand the importance of simplification, symbolization, classification, induction, centering, and scale in creating thematic maps.

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Effective Communication through Thematic Cartographic Maps

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  1. Cartographic Communication

  2. Two Types of Maps: Reference Maps • Show locations of places and geographic features • Absolute locations What are reference maps used for? Thematic Maps • Tell a story about the degree of an attribute, the pattern of its distribution, or its movement. • Relative locations What are thematic maps used for?

  3. Graduated Circle Maps or Proportional symbol • shapes of different sizes to show where and how much • Larger the circle = more phenomenon • Single variable • Population, median income, wheat production, or average land value Swine Flu

  4. Dot Map • A single or specified number of occurrences is represented by a dot • Good for suggesting spatial pattern, distribution, and dispersion • Poor at showing precise value Crime Map

  5. Commercial wireless signals

  6. Isometric/Isopleth/Isoline Map • Features isolines that connect points registering equal values of whatever is being mapped. • Isoline show where there is a uniform occurrence • Poor at showing information that might be patchy

  7. Perception of Place Where Pennsylvanian students prefer to live Where Californian students prefer to live

  8. Choropleth • Shows data in a predetermined unit. • Each unit is shaded to represent how much of an item in the borders • Can give a false impression of abrupt change • Smaller units are better than larger (1-5) is more accurate than (1-50) Election Results

  9. Cartogram • Uses statistical data to transform a space so that the largest unit on the map is the one showing the greatest statistical value • Gives a good visual representation of quantity but not good at communicating exact numbers

  10. Most thematic maps have: • Simplification- • What has the cartographer chosen to keep • Why are things left out? • Symbolization • What do the symbols add to the meaning? • Does it look attractive? • Classification • Thematic maps use categories • Equal interval or set values • Induction • Information is under the surface or hidden • Linked to classification • Centering- what is placed in the center of the map shows cultural/artistic value

  11. Simplification

  12. Simplification

  13. Symbolization Super bowl Word Symbols

  14. Symbolization

  15. Symbolization

  16. Symbolization

  17. Classification

  18. Classification

  19. Classification

  20. Induction

  21. Centering

  22. Centering

  23. Centering

  24. Scale

  25. Scale

  26. Message/Art

  27. Message/Art

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