https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 23.7 2026-04-15T10:53:30.610Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/21474df3-f9a6-48ca-be15-bdb3611fe062 SURFACE ROUGHNESS Date=2013-08-16 User Id=tbs1979 Entity=Definition Operation=UPDATE Field=text System Note=update Definition Old Value=The unevenness of the land surface that results in friction for fluid flow. This can be influenced by the presence of such things as vegetation, water bodies, mountains and other landforms, etc. New Value=The unevenness of the land surface that results in friction for fluid flow. This can be influenced by the presence of such things as vegetation, water bodies, mountains and other landforms, etc. Date=2013-08-16 User Id=tbs1979 Entity=Definition Operation=UPDATE Field=reference System Note=update Definition Old Value=EOSDIS IMS Definitions New Value=NASA EOSDIS The unevenness of the land surface that results in friction for fluid flow. This can be influenced by the presence of such things as vegetation, water bodies, mountains and other landforms, etc. 2013-08-16 09:40:10.0