Filter Results by Custom Polygon

[citizen-dror]

🚀 Feature Request: Filter Results by Custom Polygon

Summary

Add functionality to draw and use custom polygons on the map to filter and analyze data, such as accidents or user-submitted issues, within specific geographic areas.

Use Case

This feature will allow users to focus on a specific region of interest, enabling better insight into localized problems. It can support:

1. Filtering accidents or remarks by region
2. Comparing two parts of the city side by side

Proposed Functionality

• 🖊️ Draw Polygon: Allow users to draw a polygon directly on the map.
• 📤 Send to Server: The polygon geometry should be sent to the backend to filter results within that shape.
• 💾 Save Polygon: Users should be able to save polygons with a custom name, enabling:
  • Reuse of saved regions
  • Sharing with others
  • Organizing filters by area

Example User Flow

1. Click “Draw Region” and create a polygon on the map.
2. Name the region (e.g., "Downtown East").
3. Use the region as a filter when viewing accidents or reports.
4. Optionally, draw a second region for comparison.

Potential Impact

• Improve spatial analysis for urban safety projects
• Empower users to investigate trends in specific neighborhoods
• Enable side-by-side comparisons between different areas of a city

Additional Notes

• Consider storing polygons as GeoJSON on the backend
• Enable multi-polygon comparison UI (e.g., split view or overlaid stats)