Roughness depth

Single roughness depth Rzi is the vertical distance between the highest peak and the deepest valley within a sampling length.

Mean roughness depth Rz is the arithmetic mean value of the single roughness depths Rzi of consecutive sampling lengths:

The Rz definition is identical to the definition in DIN 4768:1990. The ten point height Rz as well as the parameter symbol Ry of ISO 4287:1984 have been canceled.

Maximum roughness depth Rmax is the largest single roughness depth within the evaluation length.