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Thematic Map Classification
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Classification of Thematic Maps
Types of Map Features Points Lines Areas
Qualitative, or Nominal
Descriptive Point Symbols on a Topographic Map
Descriptive Line Symbols on a Topographic Map
Contrasting Area Patterns on a Choropleth Map or a Topographic Map
Ranked, or Ordinal
Classified Graduated Symbols Map Classified Flow Map
Classified Choropleth Map
Classified Graduated Symbols Map
Dat
a Le
vel o
f M
easu
rem
ent
Quantitative, or Interval/Ratio
Discrete Phenomena Proportional Graduated
Symbols Map Continuous Phenomena
Isolines Map
Proportional Flow Map
Absolute Counts Dot Map Cartogram Proportional Graduated
Symbols Ratios or Densities Classless Choropleth MapIsolines Map
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