1. Department of Building Construction, Virginia Polytechnic and State University, Blacksburg, VA 24061, USA
2. Department of Computer Science, Virginia Polytechnic and State University, Arlington, VA 22203, USA
3. Department of Electrical and Computer Engineering, Virginia Polytechnic and State University, Arlington, VA 22203, USA
4. Department of Civil and Environmental Engineering, Virginia Polytechnic and State University, Blacksburg, VA 24061, USA
5. Department of Forest Resources Management, The University of British Columbia, Vancouver, BC V6T 1Z4, Canada