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/45351e81-fcd4-46a1-9222-315946caefc7 LIGHT TRANSMISSION Date=2018-03-07 User Id=tstevens Entity=Definition Operation=UPDATE Field=reference System Note=update Definition Old Value=Adapted from: Dictionary of Earth Science, 5th ed.. 1997. Sybil Parker, ed. in chief. McGraw-Hill. New Value=Adapted from: Dictionary of Earth Science, 5th ed.. 1997. Sybil Parker, ed. in chief. McGraw-Hill. Date=2018-03-07 User Id=tstevens Entity=BroaderRelation Operation=INSERT User Note=Move Concepts System Note=add broader relation New Value=LIGHT TRANSMISSION [45351e81-fcd4-46a1-9222-315946caefc7,86757] - WATER CHARACTERISTICS [f7e97dc3-1181-41b5-8b90-946eb2504110,310633] Date=2018-03-07 User Id=tstevens Entity=Definition Operation=UPDATE Field=text System Note=update Definition Old Value=Measurement of the percentage of light received at a photo cell placed at fixed distances from a light source. New Value=Measurement of the percentage of light received at a photo cell placed at fixed distances from a light source. Date=2018-03-07 User Id=tstevens Entity=BroaderRelation Operation=DELETE User Note=Move Concepts System Note=delete broader relation Old Value=LIGHT TRANSMISSION [45351e81-fcd4-46a1-9222-315946caefc7,86757] - WATER QUALITY/WATER CHEMISTRY [8c02f5d1-ce86-4bf5-84d5-b3496cdba6ad,83565] Measurement of the percentage of light received at a photo cell placed at fixed distances from a light source. 2018-03-07 12:24:59.0