The USDA Forest Service (in particular the Pacific Southwest Region Remote Sensing Lab) puts out some great GIS data, and they are always updating, so it’s good to check back often to see their new offerings. I have been doing quite a lot of work with forest fires over the past year and a half, and the data available are pretty incredible. Below, we see some examples of these data. The top image shows the perimeter of the Lookout Fire that occurred in the Sierra Nevada mountains in 1999. And the image below shows the fire perimeter plus fire severity, measured by canopy mortality. With these data, we can begin to tell the story of how this landscape changed, and try to make sense of the patterns of forest fires.