1. Graduate Student, Dept. of Civil and Environmental Engineering, Virginia Tech, Patton Hall, Blacksburg, VA 24061 (corresponding author).
2. Korean Land Spatialization Group, Well County 119/504, Sondodong, Yeunsugu, Incheon 406-841, South Korea.
3. Professor and Director, Dept. of Civil and Environmental Engineering, Virginia Tech, Room No.117C, Patton Hall, Blacksburg, VA 24061.