1. Associate Professor, Dept. of Geography and Planning, Appalachian State Univ., Rankin Science West Building, ASU Box 32066, Boone, NC 28608-2066 (corresponding author).
2. GIS Research Coordinator, National Environmental Modeling and Analysis Center, Univ. of North Carolina at Asheville, Robinson Hall 246, CPO #2345, 1 University Heights, Asheville, NC 28804-8511.