Halo can be used to highlight a particular category by circling points in that category with rings.
Halo allows only binary categorical features. The first bin in alphabetical order will be circled with rings. This is useful to highlight a category that has very few members. When used on a category with a large number points, the visualization can become too crowded – in these cases, the dimensions Transparency or Pulsation may be better.
Halo settings are found by switching to the Settings tab on the Mapping panel and selecting the Other button:
- Scale – Makes the halos larger or smaller
- Visibility On/Off – Turns the halos on and off without needing to remove the mapped feature