Retired, Monument, CO, USA
Department of Earth, Space, and Graphic Sciences, United States Military Academy, West Point, NY, USA
Department of Civil Engineering and Engineering Mechanics, and Department of Optics, University of Arizona, Tucson, AZ, USA
Copyright © 2016 Donald J. Koterwas et al. This is
an open access article distributed under the Creative Commons Attribution
License, which permits unrestricted use, distribution, and reproduction in any
medium, provided the original work is properly cited.