1. USDA Forest Service, National Office, Fire and Aviation Management, Fort Collins, CO 80526, USA
2. Department of Forest and Rangeland Stewardship, Colorado State University, Fort Collins, CO 80523, USA
3. USDA Forest Service, Rocky Mountain Research Station, Fort Collins, CO 80526, USA
4. USDA Forest Service, Rocky Mountain Research Station, Missoula, MT 59801, USA
5. Department of Forest Engineering, Resources & Management, Oregon State University, Corvallis, OR 97331, USA