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1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, and 2010. AVISO. The Absolute Dynamic Topography (AVISO ADT) layer is based on the absolute dynamic topography data (similar to sea level but with respect to the ge... United States. National Aeronautics and Space Administration.