https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 24.0 2026-05-27T11:35:35.756Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/f3ea8884-87a8-4a12-96d5-98e21a9fa2c7 2021-10-21 MEAN SEA LEVEL Date=2021-10-21 User Id=tstevens Entity=BroaderRelation Operation=INSERT User Note=Insert Concept System Note=add broader relation New Value=MEAN SEA LEVEL [f3ea8884-87a8-4a12-96d5-98e21a9fa2c7,778235] - SEA LEVEL [d17151a9-e03f-49ee-8d3a-d653ac84c071,778233] Date=2021-10-21 User Id=tstevens Entity=BroaderRelation Operation=INSERT User Note=Move Concepts System Note=add broader relation New Value=MEAN SEA LEVEL [f3ea8884-87a8-4a12-96d5-98e21a9fa2c7,778235] - SEA LEVEL [9ac7a1c5-4179-47bc-8589-ebaa90d6cbd1,778170] Date=2021-10-21 User Id=tstevens Entity=BroaderRelation Operation=DELETE User Note=Move Concepts System Note=delete broader relation Old Value=MEAN SEA LEVEL [f3ea8884-87a8-4a12-96d5-98e21a9fa2c7,778235] - SEA LEVEL [d17151a9-e03f-49ee-8d3a-d653ac84c071,778233] Date=2021-10-22 User Id=tstevens Entity=Definition Operation=INSERT System Note=insert Definition New Value=id: null text: An average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. language code: en An average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. 2021-10-22 12:48:15.0