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Sydney to Southport Yacht Race
Madeleine Cahill of CSIRO Marine Research has prepared this sea surface elevation image from radar altimeter measurements from
European and French/USA satellites. In addition, she has computed the ocean currents from the topography in the
same way that meteorologists compute winds from pressure maps. We find that the current speeds calculated this
way can be underestimated by as much as 40% and that sudden current changes can be a little smeared over. These
are a result of the grid spacing of the satellite overflights. However, the current patterns are similar to what one
would derive from experience applied to good cloud-free satellite infrared images.
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Thanks to all, have a great race. Glenelg Smith Satellite Data Manager.
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