Abstract:　The　areal　Gaussian　filtering　is　the　current　standardized　approach　for　the　separation　of　roughness　and　waviness　components　of　a　surface　topography　for　areal　surface　measurements　and　analysis.　Although　the　technical　specifications　(ISO　25178)　recommend　certain　nesting　index　for　areal　Gaussian　filters,　the　use　of　standard　values　is　not　possible　in　some　cases,　particularly　when　the　recommended　value　exceeds　the　range　of　the　measurement　software.　Therefore,　it　is　necessary　to　find　an　appropriate　nesting　index　value　other　than　that　recommended　by　the　standard.　The　aim　of　this　study　is　to　investigate　the　influence　of　Gaussian　filter　selection　on　areal　surface　texture　parameter　determination　for　structured　surfaces.　The　results　suggest　that　the　nesting　index　of　a　Gaussian　filter　for　areal　surface　parameter　determination　and　analysis　should　be　at　least　three　times　the　scale　of　the　coarsest　surface　structure.　©　2020,　Pleiades　Publishing,　Ltd.