Figure 1 Ebb surface current pattern (upper panel) measured with the SeaSonde HF radar, (centre panel) modelled and (lower
panel) modelled with data assimilation.
0.75 ensures that the modelled field in (10) always exerts the assimilated field. The observed currents are assimilated
some influence on the final estimate at each grid point; since into the circulation model by applying equation (10) to each
the modelled fields are spatially smoother than the SeaSonde hourly measurement, without time nudging.
measurements, this weight provides some smoothing of noise
430 Intemational Archives of Photogrammetry and Remote Sensing. Vol. XXXII, Part 7, Budapest, 1998