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Sdq (Root Mean Square Gradient) | Area Roughness Parameters

Sdq (Root Mean Square Gradient)

Sdq is calculated as a root mean square of slopes at all points in the definition area.

The Sdq of a completely level surface is 0.
Sdq (Root mean square gradient)

When a surface has any slope, its Sdq value becomes larger. The surface below is a plane with gradient components of 45 degrees and has an Sdq value of 1.
Sdq (Root mean square gradient)

Sdq (Root mean square gradient)

Search from the parameters list

Height Sa (arithmetical mean height)
Sz (Maximum height)
Sq (Root mean square height)
Ssk (Skewness)
Sku (Kurtosis)
Sp (Maximum peak height)
Sv (Maximum pit height)
Spatial Sal (Auto-correlation length) / Str (Texture aspect ratio)
Std* (Texture direction)
Hybrid Sdq (Root mean square gradient)
Sdr (Developed interfacial area ratio)
Functional Smr(c) Areal material (bearing area) ratio
Smc(mr) Inverse areal material ratio
Sk(Core height)
Spk (Reduced peak height)
Svk (reduced dale height (reduced valley depth))
Smr (Peak material portion)
Smr2 (Valley material portion)
Sxp (Peak extreme height)
Functional volume Vvv (Dale void volume)
Vvc (Core void volume)
Vmp (Peak material volume)
Vmc (Core material volume)
Feature Spd (Density of peaks)
Spc (Arithmetic mean peak curvature)
S10z / S5p / S5v / Sda(c) / Sha(c) / Sdv(c) / Shv(c)

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