1. GNSS Researcher, National Geodetic Survey, National Oceanic and Atmospheric Administration, 325 Broadway St. N/NGS, Boulder, CO 80305 (corresponding author). ORCID: .
2. GNSS Researcher, National Geodetic Survey, National Oceanic and Atmospheric Administration, 7600 Sand Point Way, Seattle, WA 98115.
3. Geodesist, National Geodetic Survey, National Oceanic and Atmospheric Administration, 1315 East West Highway, Silver Spring, MD 20910. ORCID: