Dana J. Caccamise II and Dr. Mark S. Schenewerk are two of the founders of General Positioning LLC, Roeland Park, Kan. Caccamise is a senior design engineer in the geodetic science division at Ohio State University and has worked as a private engineering consultant to GNSS manufacturers and their clients since 1998. Schenewerk has worked as a private consultant providing support for and conducting research in GNSS-related projects since 2001. Prior to that, he was employed by the National Geodetic Survey where he helped create its GPS data processing software.
Like airplanes, skyscrapers, dams and other large engineered structures, bridges constantly deform by design and by necessity. All modern bridges, for example, contain expansion joints to ensure that thermal expansion and contraction will not buckle the bridge or tear it apart. Following the wind-induced collapse of Washington’s Tacoma Narrows Bridge in November 1940, structural design engineers have taken considerable care to ensure that wind stresses will not trigger destructive mechanical resonances in suspension bridges.