These are lands designated as national parks, historic areas, Indian lands, and wildlife refuges. For health and safety concerns, cells that overlap with areas designated as protected lands are excluded. The full list of the GIS data that falls in this category includes national parks, national monuments, national forests, wilderness areas, state parks, wild and scenic rivers, wildlife refuges, Indian lands, hospitals, schools, colleges, correctional facilities, inventoried roadless areas, and areas of critical environmental concern. This is a composite metric that combines at least 14 datasets. The data are obtained from different sources including the National Forest Service, Bureau of Land Management, US Fish and Wildlife Service, National Wild and Scenic Rivers, National Atlas of the USA, and some commercial sources.