Design Strategies for Continuous-tone Area Mapping

Abstract

Conventional choropleth maps are constructed with class intervals whereby a given map symbol represents a range of data values in a distribution. Tobler recently has introduced a computer-assisted method to produce choropleth maps without class intervals by means of continuous-tone map symbol variation. Three design modifications for such continuous-tone choropleth maps include an improved legend, an alternative data-value map symbol allocation, and area symbols with pattern variation complementing cross-hatch line symbolism.

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