sea_surface_mean_square_upwave_slope_direction
https://w3id.org/hacid/data/cs/variables/cf/sea_surface_mean_square_upwave_slope_direction <https://w3id.org/hacid/onto/data/Variable>
Wave slope describes an aspect of sea surface wave geometry related to sea surface roughness. Mean square slope describes a derivation over multiple waves within a sea-state, for example calculated from moments of the wave directional spectrum. The phrase "upwave_slope_direction" is used to assign a primary directional axis along which wave energy associated with the slope calculation is travelling; "upwave" is equivalent to "from_direction" which is used in some standard names.
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sea_surface_mean_square_upwave_slope_direction