https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 23.6 2026-03-19T10:41:57.720Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/68f93a0c-1525-4f5a-9545-5d94191a3dbf SEA SURFACE TOPOGRAPHY Date=2021-11-02 User Id=tstevens Entity=BroaderRelation Operation=DELETE User Note=Move Concepts System Note=delete broader relation Old Value=SEA SURFACE TOPOGRAPHY [68f93a0c-1525-4f5a-9545-5d94191a3dbf,789416] - Trash Can/Science Keywords [c5a4126a-8f0a-4774-9bef-c2a9f9487727,788365] Date=2021-10-21 User Id=tstevens Entity=BroaderRelation Operation=INSERT User Note=Move Concepts System Note=add broader relation New Value=SEA SURFACE TOPOGRAPHY [68f93a0c-1525-4f5a-9545-5d94191a3dbf,775007] - SEA ICE [d73e969a-4b66-4713-8d63-fa3cbb1e25e3,774840] Date=2021-11-02 User Id=tstevens Entity=BroaderRelation Operation=DELETE User Note=Cut Concepts System Note=delete broader relation Old Value=SEA SURFACE TOPOGRAPHY [68f93a0c-1525-4f5a-9545-5d94191a3dbf,789416] - SEA ICE [d73e969a-4b66-4713-8d63-fa3cbb1e25e3,789249] Date=2021-10-22 User Id=tstevens Entity=Definition Operation=UPDATE Field=text System Note=update Definition Old Value=To measure sea surface height, or surface topography, scientists need to obtain the precise distance between the satellite and the center of the Earth and the precise distance between the satellite and the sea surface. Sea surface height is then calculated by subtracting the distance between the sea surface and the satellite from the distance between the center of the Earth and the satellite. The distance between the satellite and the center of the Earth is obtained by carefully monitoring the satellite position at all times. New Value=To measure sea surface height, or surface topography, scientists need to obtain the precise distance between the satellite and the center of the Earth and the precise distance between the satellite and the sea surface. Sea surface height is then calculated by subtracting the distance between the sea surface and the satellite from the distance between the center of the Earth and the satellite. The distance between the satellite and the center of the Earth is obtained by carefully monitoring the satellite position at all times. Date=2021-10-21 User Id=tstevens Entity=BroaderRelation Operation=DELETE User Note=Move Concepts System Note=delete broader relation Old Value=SEA SURFACE TOPOGRAPHY [68f93a0c-1525-4f5a-9545-5d94191a3dbf,775007] - OCEANS [91697b7d-8f2b-4954-850e-61d5f61c867d,774817] Date=2021-05-14 User Id=tstevens Entity=NarrowerRelation Operation=INSERT User Note=Insert Concept System Note=add narrower relation New Value=SEA SURFACE TOPOGRAPHY [68f93a0c-1525-4f5a-9545-5d94191a3dbf,603745] - SEA LEVEL [9ac7a1c5-4179-47bc-8589-ebaa90d6cbd1,606942] Date=2021-10-22 User Id=tstevens Entity=Definition Operation=UPDATE Field=reference System Note=update Definition Old Value="http://www.icess.ucsb.edu/geos/11151.html" New Value=https://www.noaa.gov/ Date=2021-11-02 User Id=tstevens Entity=BroaderRelation Operation=INSERT User Note=Move Concepts System Note=add broader relation New Value=SEA SURFACE TOPOGRAPHY [68f93a0c-1525-4f5a-9545-5d94191a3dbf,789416] - OCEANS [91697b7d-8f2b-4954-850e-61d5f61c867d,789226] Date=2021-10-21 User Id=tstevens Entity=NarrowerRelation Operation=INSERT User Note=Insert Concept System Note=add narrower relation New Value=SEA SURFACE TOPOGRAPHY [68f93a0c-1525-4f5a-9545-5d94191a3dbf,775007] - MEAN SEA SURFACE [70082342-c777-49e9-88e5-a4a77728d3cc,778239] Date=2021-10-21 User Id=tstevens Entity=NarrowerRelation Operation=INSERT User Note=Move Concepts System Note=add narrower relation New Value=SEA SURFACE TOPOGRAPHY [68f93a0c-1525-4f5a-9545-5d94191a3dbf,775007] - DYNAMIC TOPOGRAPHY [940550d2-1d9f-4c28-b9ba-857c2dc8ef95,778236] Date=2021-11-02 User Id=tstevens Entity=BroaderRelation Operation=INSERT User Note=Cut Concepts System Note=add broader relation New Value=SEA SURFACE TOPOGRAPHY [68f93a0c-1525-4f5a-9545-5d94191a3dbf,789416] - Trash Can/Science Keywords [c5a4126a-8f0a-4774-9bef-c2a9f9487727,788365] To measure sea surface height, or surface topography, scientists needto obtain the precise distance between the satellite and the center ofthe Earth and the precise distance between the satellite and the seasurface. Sea surface height is then calculated by subtracting thedistance between the sea surface and the satellite from the distancebetween the center of the Earth and the satellite. The distance betweenthe satellite and the center of the Earth is obtained by carefullymonitoring the satellite position at all times. 2021-10-22 12:44:26.0