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Map Types

Locator

Reference

Thematic

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Locator Map

Shows the location of something

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Reference Maps

• Special Purpose (not as important)

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Reference Maps

• Political-shows countries, counties,

boundaries, etc.

• Physical Maps-shows mountains,

rivers, plains, etc.

• Road Maps-shows interstates,

roads, etc.

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Thematic Maps

Graduated or Proportional Symbol

Dot Distribution

Choropleth

Isoline

Cartogram

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STATE PLATE

VANITIZATION RATE

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Graduated Symbol or Proportional Symbol

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Graduated symbol

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Graduated or Proportional

Symbol Map●A thematic map in which the size of the

symbol varies in proportion to the

frequency or intensity of the mapped

variable.

●What could be strengths of this type of

map?

●What could be weaknesses of this type of

map?

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Pros

• Very easy to read and understand

• Flexible because you can use all different

types of data

Cons

• Congestion/overlap (can’t see what’s

below the symbol)

• Map readers generally don’t estimate the

areas of symbols very well

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Dot distribution

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Dot Distribution – “Political Donations in Greenwich

Village, New York, NY”

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*A thematic in which a dot is used to

represent some frequency of the

mapped variable.

*What could be strengths of this type of

map?

*What could be weaknesses of this type

of map?

Dot Map

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Pros

• Shows actual, precise locations of

phenomena

• The “dot” can be a symbol or shape making

it easier to see

Cons• Anything less than the minimum “dot”

amount will not be shown on the map

• Can be difficult to read, have to count up the

dots

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Choropleth

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Choropleth Maps

●A thematic map in which areas are shaded or

patterned in proportion to the measurement of the

statistical variable being displayed on the map,

such as population density or per-capita income.

●What could be strengths of this type of map?

●What could be the weaknesses of this type of

map?

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Pros

• Easy to read

• Easy to make

Cons

• Dangerous because of

induction, classification, etc.

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Isoline

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Isoline

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Isoline maps

●A Thematic map with lines that connect

points of equal value

●What could be strengths of this type of

map?

●What could be the weaknesses of this

type of map?

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Pros

• Where lines are close together,

shows zone of rapidly changing

value

Cons

• Not as common in human

geography because of what we

show

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Cartogram

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Cartogram

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Cartogram

●A Thematic map in which some thematic

mapping variable is substituted for land

area (e.g., GDP)

●What could be strengths of this type of

map?

●What could be the weaknesses of this

type of map?

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Pros

• Visually impactful

Cons

• True size and direction is

distortion

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Are maps FACT or OPINION?

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Simplification

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Simplification

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Symbolization

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Symbolization

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Symbolization

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Symbolization

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Classification

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Classification

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Classification

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Induction-more info is given

than from the original data

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Centering

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Centering

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Centering

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Scale

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Scale

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Scale

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Message/Art

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