Methodology & Notes
The parcels highlighted on this map were identified using satellite-based vegetation health
indicators that detect tree stress and canopy moisture loss. A high risk score does not
indicate a confirmed fire hazard or abatement violation — it indicates that the vegetation
on the parcel showed significant decline during the 2025 growing season and warrants closer
on-site inspection.
Vegetation stress estimates are derived from Sentinel-2 Level-2A surface reflectance imagery
using three spectral indices: NDVI (vegetation vigor), NDWI (canopy water content), and
NDRE (chlorophyll concentration). Parcels were assessed across three dates in 2025 (June,
August, October) and scored based on current vegetation condition and seasonal decline.
Parcel boundaries are sourced from the San Bernardino County Assessor's Office. This
assessment was produced for academic purposes and does not constitute an official county
risk determination.