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<a accesskey="3" href="page.php?w=Ocean_surface_topography&amp;p=2">3.Next</a>
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<p><a href="page.php?w=Image%3AOcean_dynamic_topography.jpg">400px</a><b>Ocean surface topography</b> or <b>sea surface topography</b>, also called <b>ocean dynamic topography</b>, are highs and lows on the ocean surface, similar to the hills and valleys of Earth's <a href="page.php?w=terrain">land surface</a> depicted on a <a href="page.php?w=topographic_map">topographic map</a>. These variations are expressed in terms of average <b>sea surface height</b> (<b>SSH</b>) relative to Earth's <a href="page.php?w=geoid">geoid</a>. The main purpose of</p><p>
<a accesskey="3" href="page.php?w=Ocean_surface_topography&amp;p=2">3.Next</a>
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