Figure 7
From: Sea level measurements using multi-frequency GPS and GLONASS observations
Van de Casteele test for sea level from frequency L 1 for GPS (left) and GLONASS (right). The Van de Casteele diagrams consist of simultaneous sea level height measurements on the y-axis and tide gauge error on the x-axis (tide gauge sea level minus the GNSS-derived sea level). Results for the SNR analysis are shown as blue diamonds, and results for the phase delay analysis are shown as green circles. The vertical black dashed line indicates a tide gauge error of zero. There appears to be no systematic error for the GNSS-derived sea level.