Teams at the USGS EROS Center have completed fire atlases for nine National Parks across the U.S. Each atlas defines the size and severity of each fire in each park since 1984, including fires too small to be mapped by other programs. Yellowstone National Park has had nearly 100 fires, for example, ranging from a few acres to thousands of acres. The project used data from Landsat for earlier years, and both Landsat and Copernicus Sentinel-2 data for more recent fires. On this episode of Eyes on Earth, we hear from a project leader at EROS about the fire atlas effort.