1. Graduate Student, School of Civil and Construction Engineering, Oregon State Univ., 101 Kearney Hall, Corvallis, OR 97331.
2. Geodesist, National Geodetic Survey of National Oceanic and Atmospheric Administration, 1315 East-West Highway, Silver Spring, MD 20910; formerly, Assistant Professor, School of Civil and Construction Engineering, Oregon State Univ., 101 Kearney Hall, Corvallis, OR 97331 (corresponding author).
3. Geodesist, National Geodetic Survey of National Oceanic and Atmospheric Administration, 1315 East-West Highway, Silver Spring, MD 20910.