1. Civil and Mineral Engineering, University of Toronto, 35 St. George St., Toronto, ON M5S 1A4, Canada
2. NVIDIA Seattle Robotics Lab, 11431 Willows Rd., Redmond, WA 98052, USA
3. Civil and Environmental Engineering, University of Michigan, 2350 Hayward St., Ann Arbor, MI 48109, USA
4. Civil and Environmental Engineering, Rutgers University, 96 Frelinghuysen Rd., Piscataway, NJ 08854, USA