JSM 2011 Online Program

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Abstract Details

Activity Number: 526
Type: Contributed
Date/Time: Wednesday, August 3, 2011 : 10:30 AM to 12:20 PM
Sponsor: Section on Statistical Computing
Abstract - #303289
Title: Visualize the Changes in Choropleth Maps Through TCmaps
Author(s): Daniel Carr*+ and Chunling Zhang
Companies: George Mason University
Address: Statistics MS4A7, Fairfax , VA, 22030,
Keywords: maps ; small multiples ; change blindness
Abstract:

Looking for and thinking about changes in juxtaposed choropleth maps is complicated by change blindness. Every time our eyes jump in movements called saccades we are blind and our change detectors are reset. All that can be compared is a little area of focal attention in the first map that is sufficiently retained in visual working memory for comparison against the same little area of the second map. Careful comparison requires scrutiny and takes time. Showing changes explicitly as well as the original maps for context provides a general approach that addresses the challenge. The general approach is relevant to sequences of small multiple maps indexed by time or other variables such as sex or age group. However, there are many specific ways to define and represent changes. The methods we developed are implemented in dynamic Java software called TCmaps. This imports boundary files for maps and data for the map regions, and provides a variety of ways to represent data for index series of maps and control the map layouts that show both change and the original maps context.


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