Thematic Maps- Choropleth, Dot Density, and Proportional Symbol (Cartographic Designs) Flashcards Preview

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Flashcards in Thematic Maps- Choropleth, Dot Density, and Proportional Symbol (Cartographic Designs) Deck (4)
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1

Choropleth Map Purpose

Obtain sense of spatial pattern, Compare two or more choropleth maps, Obtain approximate value for a geographic area

2

Why Choropleth

Extremely popular, easy to visualize variation of phenomenon across geographic area, shows levels of variability in a region

3

Choropleth Map

Thematic map in which previously defined areas are shaded or patterned in proportion to the measurement of statistical variable

4

Choropleth Data

Discrete and derived(not absolute), ratios involving and idependent of area, data attached to enumeration unit, standardized to show rates and ratios, attached to a continuous statistical surface