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# ArcGIS Bivariate Mapping Tools

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Bivariate maps show two themes on the same map. The graphic marks used to represent the themes may be different, as with proportional symbols on a choropleth map, or they may be the same. Bivariate choropleth and bivariate point symbol maps fall into the latter category. Although ArcGIS does not have any out of the box tools to make these same-symbol bivariate maps, in this presentation I introduce a new set of tools that can be used to ease the compilation of these maps. Combined with standard tools, it is now easier and faster to make these bivariate maps in ArcGIS.

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### ArcGIS Bivariate Mapping Tools

1. 1. 2013 NACIS Conference October 10-11, 2013 | Greenville, SC ArcGIS Bivariate Mapping Tools Aileen Buckley, Esri
2. 2. 2013 NACIS Conference October 10-11, 2013 | Greenville, SC Choropleth ArcGIS Bivariate Mapping Tools Aileen Buckley, Esri
3. 3. The purpose of multivariate mapping • To display more than one variable simultaneously • To allow for estimation of the degree or spatial pattern of cross-correlation between variables • Effectiveness of a method is related to readability and accurate representation of the data
4. 4. Cross-variable mapping • Simultaneously depict magnitude of variables within homogeneous area for multiple map themes - Bivariate mapping Trivariate mapping
5. 5. Bivariate choropleth maps • Maps that simultaneously show two variables using the choropleth map method - - Choropleth maps use polygon fills to represent quantitative values Greek χώρο– + πλήθ[ος] “choro” (area/region) + “pleth” = quantity/increase
6. 6. What are the considerations when you use choropleth maps? • Choropleth maps give the impression of - • Uniformity in data within the data collection units Abrupt breaks that occur at the unit boundaries Use quantitative values that are spatially intensive (i.e., do not depend on the size of the unit area)
7. 7. Learn more! • ArcUser, Winter 2013
8. 8. Early examples
9. 9. Early examples
10. 10. http://www.census.gov/population/www/cen2000/atlas/pdf/censr01-103.pdf
11. 11. Making Beautiful Maps
12. 12. Cross-variable mapping • Limitations - - • Advantages Because the number of - This technique is useful for classes the human eye can simultaneously displaying a distinguish is limited, crossfew variables (two or three) variable mapping is generally restricted to combinations of either two or three variables • Recommendations - It is often useful to also Appropriate symbol (color) provide separate maps of selection is important for map each of the variables shown readability on the bi- or trivariate map
13. 13. Two ways to do this in ArcMap Exploration • Bivariate renderer Use this to render the data on-the-fly - Use this to create a live legend (linked to the renderer) - Presentation • Bivariate script tool Use this to calculate the quantile classes in the feature class - Use the Match to Symbols in a Style renderer - Use the LegendMaker.mxd to make the legend -
14. 14. Bivariate renderer • Download the .zip file and unzip it • Register the .dll Directory and name of the file
15. 15. Styles – based on Brewer’s color research
16. 16. Brewer’s Color Schemes • Diverging color schemes Brewer, Cynthia. 2005. Designing Better Maps, with permission form CaGIS and Esri Press
17. 17. Used to find intermediate colors http://meyerweb.com/eric/tools/color-blend/
18. 18. ArcMap styles
19. 19. ArcMap styles
20. 20. Making Beautiful Maps