choropleth maps

geog365

classed data

block classes in key - no overlapping values and relatively equal groups

unclassed data

sliding scale of color rather than blocked sections

choropleth mapping requires standardized data

true

enumeration unit

areal unit in which enumerated data is aggregated

* used as the basemap

choropleth mapping used raw count data

false

advantage and disadvantage of a classed map

A - Tight control over the look of the map

D - need to select classification scheme and number of classes

advantage and disadvantage of an unclassed map

A - do not have to select classification scheme or number of classes

D - lack of fidelity between % ink and greytone perception