Small Scale Workshop | Bivariate Choropleth Mapping

Welcome! Let’s get mapping.

Presenters

Kelsey Rydland - Data Science Librarian

Méch Frazier - Geospatial Specialist

Geospatial and Data Services - Northwestern University Libraries

• We’ll be using ArcPro and ArcOnline for today’s demo. You’ll need to create an ArcGIS Online account here. To download and install ArcPro, go here.

• ArcOnline is compatiable with Mac and Windows OS; ArcPro is only compatiable with Windows OS

• Want to follow along the demo? Download Data

Goal of this workshop

This workshop is meant to serve as an introduction to bivariate choropleth mapping. It’s a simple workshop that you should be able to replicate on your own afterwards.

By the end of this workshop you will be able to:

• Distinguish between univariate and bivariate

• Use resources from ArcGIS Online public layer sources

• Knowledge of basic symbology functions

• Ability to make a bivariate choropleth map and layout

• Resources and support opportunities

Considerations

• Normalize your data (!)

• Use variables you suspect have a relationship (e.g., rainfall & diabetes vs. obesity & diabetes)

• Not statistically significant, only looking at highest vs. lowest values of overlaid variables

Data

• NHGIS County Shapefile

• CDC U.S. Diabetes Surveillance System

  • Adults Aged 20+ Years; Age-Adjusted Percentage; U.S. Counties; 2016

To be used during demo

• Join fields “GEOID” from US.shp and “CountyFIPS” from Sheet1$
• Copy and paste: Obesity and Diabetes Measures 2016 CDC