Module 6: Proportional Symbol and Bivariate Choropleth Mapping

Proportional Symbol Mapping with Positive and Negative Values Proportional symbol mapping effectively displays positive and negative values by combining circle size for magnitude with color for direction (green for gains, red for losses). To implement this, negative values must be exported as a separate feature class, with a new field created using absolute values. The minimum and maximum size thresholds for both positive and negative symbols must be set to the same values to ensure an accurate visual comparison of magnitudes regardless of whether they represent gains or losses. Bivariate Choropleth Mapping The key steps for preparing data for bivariate choropleth mapping include: 1. Data Preparation: Ensure your variables are normalized (in this case, both obesity and physical inactivity are already in percentages) Create new fields in your attribute table to store the classifications (e.g., CLASS_OBESE, CLASS_ACTIVITY, and CLASS_FINAL) Each variable needs to be classified separately ...