difficulty differentiating color categories based on the orange color ramp, especially when using the six-color maps. These results supported further investigation and testing of other color ramps that provide a greater contrast between classes in a given ramp. Also, after seeing the difficulties respondents had with the dark boundary choropleth maps during the focus group and cognitive tests, we concluded both choropleth and isopleth maps should include light county boundaries. The two new maps below show the same general health data as the first two maps to the left, with a new divergent color ramp, which goes from red to blue. The new map format, designed to improve user accuracy in retrieving data from choropleth and isopleth maps, will be tested through an internet survey of approximately 400 public health researchers and professionals. Data from the internet survey will facilitate analysis of key issues such as users’ accuracy of data retrieval from choropleth versus isopleth maps, differences in data retrieval from national versus regional maps and users’ preferences for choropleth versus isopleth maps. These results will allow the CDC to determine the best format and features for providing online maps for BRFSS data users. Cognitive Assessment of Geospatial Survey Data

Cognitive Assessment of Geospatial Survey Data

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Cognitive Assessment of Geospatial Survey Data