When mapping quantitative data in polygons, should you represent the values with color, to make a choropleth map, or size, to make a graduated symbol map? It depends on whether you are mapping raw or derived values. This video shares examples and analogies in ArcGIS Online and ArcGIS Pro to help make sense of this cartographic rule.
The data shown in this video is derived from
Street Lights and
Census 2021 Dissemination Areas from
Halifax Open Data.