1. Professor Emeritus, Geodetic Science Program, School of Earth Sciences, Ohio State Univ., 275 Mendenhall Laboratory, 125 South Oval Mall, Columbus, OH 43210.
2. President, Polaris Geospatial Services, LLC, 7281 Park Bend Dr., Westerville, OH 43082; Adjunct Professor, Geodetic Science Program, School of Earth Sciences, Ohio State Univ., 275 Mendenhall Laboratory, 125 South Oval Mall, Columbus, OH 43210 (corresponding author). ORCID: .