Overlay analysis of wildfire hazard zones, neighborhoods, and residential parcels

• Question. How many Riverside homes sit in designated fire hazard severity zones, and which neighborhoods are most exposed?

• Data. CAL FIRE Fire Hazard Severity Zones; City of Riverside boundary, neighborhoods, zoning parcels, and landmarks.

• Methods

  • Clipped hazard zones to the city and identified landmarks inside them.

  • Intersected dissolved hazard zones with neighborhoods to calculate the percentage of each neighborhood’s area at risk.

  • Assigned a hazard class to every residential parcel and summarized counts citywide and by neighborhood.

  • Designed a single-page layout with a citywide frame, two neighborhood insets, and summary statistics.

• Findings. About 19% of Riverside’s residential parcels lie in a fire hazard zone. In the two most exposed neighborhoods the share exceeds 80%: La Sierra Hills (82.6%, more than half in Very High zones) and Alessandro Heights (80.9%).

• Tools. ArcGIS Pro

• Images. Neighborhood choropleth; parcel-level layout with insets