Abstract
Research into the quality of map reader's perceptions of correlation from conventional mapping has shown that there is much more to be done in this area. The two-variable maps produced by the US Bureau of the Census using a 16-colour shading scheme have the potential for portraying correlation but fail to achieve a high level of understanding, in part due to the design problems inherent in the use of colour to code quantitative data. This study provides an alternative to the use of colour and classification on two-variable maps. Several tests were run to determine the feasibility of the use of crossed-line shading patterns on two-variable maps. These initial experiments have shown that subjects are able to make valid visual interpretations of the variable mesh patterns used in terms of value retrieval, system logic and correlation perception.
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