Practical GIS

Graduated mapping

The other common method, graduated styling, is useful to show comparable attributes, effectively on interval and ratio scales. This method is type-specific, as we can only compare numbers directly. By using this method, QGIS creates intervals (bins), groups the attributes, links a color to every interval, and draws the features accordingly. We can apply graduated symbology to every geometry type, although the most common use cases are using a color ramp for shading polygons (choropleth map), and applying different icon sizes on points (proportional symbol map). First, let's apply a filter on our GeoNames layer (or its extract) to only show some of the settlements. With the following query we can filter only the seats of ...