In furtherance of ABC Emergency - Real-time Australian Emergency Alerts for Home Assistant - Share your Projects! / Custom Integrations - Home Assistant Community I needed a way to display polygons on maps - so here we are.
I’ve created a frontend component capable of polygon mapping - troykelly/lovelace-abc-emergency-map: Custom Lovelace card for Home Assistant displaying ABC Emergency incident polygons on a Leaflet map
Although it’s primary role in life is supporting the ABC Emergency mapping - feel free to use it for your other polygon mapping needs.
This card uses Leaflet.js to render those polygons while maintaining full compatibility with standard Home Assistant map card features.
| Feature | Native HA Map | ABC Emergency Map Card |
|---|---|---|
| Point markers | Yes | Yes |
| Entity tracking | Yes | Yes |
| Zone display | Yes | Yes |
| History trails | Yes | Yes |
| Polygon boundaries | No | Yes |
| Alert level colors | No | Yes |
| Incident animations | No | Yes |
| Severity-based layering | No | Yes |
Features
Emergency Incident Display
- Polygon Rendering - Incident boundaries displayed as actual polygons, not just points
- Australian Warning System Colors - Severity-based coloring (Emergency Warning, Watch and Act, Advice, Information)
- Severity Layering - Higher severity incidents render on top for visibility
- Smooth Transitions - Morphing polygon boundaries when incidents update