I built a website for comparing satellite images from ESA Copernicus Sentinel-2 of Southern California from before and during the January 2025 wildfires. The extent of the damage to vegetation and buildings is clearly visible from these images.

Although Copernicus Sentinel-2 data and tools are open and free to use via Copernicus Browser (https://browser.dataspace.copernicus.eu/), I hope that this website presents the data in a makes the data more accessible and easier to share with less technical users.

The web viewer was created using Leaflet and leaflet-compare. Other tools used include Microsoft Planetary Computer, PySTAC Client, Rasterio, and GDAL.

Related: This previous Show HN (https://news.ycombinator.com/item?id=42641530) does something similar but with NOAA GOES instead.