Choropleth Mapping
Reading: Slocum text, Chapters 5 & 13 (through page 89)

Example choropleth maps:
Census atlas and briefs
CDC-NCHS examples :  heart disease  (detail), cancer
 

Type of data mapped
Basics of classification

Classification types

Constant intervals:

• equal interval
• mean-standard deviation

• irregular: quantiles
• systematic: arithmetic,geometric

• natural breaks by eye
• maximum breaks
• Jenks optimization ('natural breaks' in ArcMap)

U.S. example maps
Stroke, white female, mortality rates

Example histograms for stroke maps (sideways)

Quantile map:

Boxplot map:

Example ArcMap Classification window:

NEXT