DIN EN 13036-5:2017-07

This European standard specifies the mathematical processing of digitized longitudinal profile measurements to produce evenness indices. The document describes the calculation procedure for the International Roughness Index (IRI), Root Mean Square (RMS) and Longitudinal Profile Variance (LPV) from three separate wavelength bands and the ?WLP and ?WLP from the Weighted Longitudinal Profile (WLP). The evenness range covered in this standard is defined as the wavelength range 0,5 m to 50 m. It should be noted that both shorter and longer wavelengths can also influence the driving comfort but those are not covered in this standard. The standard doesn't define from what position on the road the longitudinal profile should be obtained.