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Area Roughness Parameters

Sdr (Developed interfacial area ratio)

This parameter is expressed as the percentage of the definition area's additional surface area contributed by the texture as compared to the planar definition area.

The Sdr of a completely level surface is 0.
Sdr (Developed interfacial area ratio)

When a surface has any slope, its Sdr value becomes larger. The surface below is a plane with gradient components of 45 degrees and has an Sdr value of 0.414.
Sdr (Developed interfacial area ratio)

Sdr (Developed interfacial area ratio)

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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 roughness depth)
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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