https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 23.8 2026-04-29T10:52:37.449Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/9ac7a1c5-4179-47bc-8589-ebaa90d6cbd1 2021-05-14 SEA LEVEL Date=2021-10-21 User Id=tstevens Entity=NarrowerRelation Operation=INSERT User Note=Move Concepts System Note=add narrower relation New Value=SEA LEVEL [9ac7a1c5-4179-47bc-8589-ebaa90d6cbd1,778170] - SEA LEVEL ANOMALY [0fde8353-9773-4948-b206-9c273c2100c8,778234] Date=2021-05-14 User Id=tstevens Entity=BroaderRelation Operation=INSERT User Note=Insert Concept System Note=add broader relation New Value=SEA LEVEL [9ac7a1c5-4179-47bc-8589-ebaa90d6cbd1,606942] - SEA SURFACE TOPOGRAPHY [68f93a0c-1525-4f5a-9545-5d94191a3dbf,603745] Date=2021-10-21 User Id=tstevens Entity=NarrowerRelation Operation=INSERT User Note=Move Concepts System Note=add narrower relation New Value=SEA LEVEL [9ac7a1c5-4179-47bc-8589-ebaa90d6cbd1,778170] - MEAN SEA LEVEL [f3ea8884-87a8-4a12-96d5-98e21a9fa2c7,778235] Date=2021-05-20 User Id=tstevens Entity=Definition Operation=UPDATE Field=reference System Note=update Definition New Value=https://podaac.jpl.nasa.gov/dataset/MERGED_TP_J1_OSTM_OST_GMSL_ASCII_V5 Date=2021-05-14 User Id=tstevens Entity=Definition Operation=INSERT System Note=insert Definition New Value=id: null text: An average level of the surface of Earth's oceans from which heights such as elevation may be measured. language code: en An average level of the surface of Earth's oceans from which heights such as elevation may be measured. 2021-10-21 09:21:31.0