California wildfire perimeters (1950+). Includes separate groups for just large fires (5000+ acres) vs all fires, and a separate layer for Prescribed Burns. The All Fires group is scale dependent and starts displaying at 1:500,000 scale. Prescribed fires likewise begin displaying at 1:500,000 scale. Full labels included only for 2010+ Large Fires, Year-only labels for other large fires, and those all display starting at 1:500,000 scale. Only 2000s and 2010s large fires are on by default. The data is updated annually with fire perimeters from the previous fire season. This service represents the latest official release, and is updated annually when a new version is released. As of July, 2021, it represents fire20_1.