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9.2 Definition of parameters
9.2.1 Arithmetic Mean Deviation of Profile Ra
The arithmetic average value of the vertical coordinates' absolute value within one sampling length.
dx
x
Z
l
Ra
l
0
1
Z
1
Z
2
Zi
Zn
9.2.2 Root-mean-square Deviation of Profile Rq
The root-mean-square value of the vertical coordinate value within one sampling length.
l
dx
x
Z
l
Rq
0
2
1
9.2.3 Maximum height of the profile Rz
The sum height between maximum profile peak height Rp and maximum profile valley depth Rv within one
sampling length.
9.2.4 Total Peak-to-valley Height Rt
The sum height between maximum profile peak height and maximum profile valley depth within the assessment
length.
9.2.5 Maximum profile peak Rp
Maximum profile peak Zp within an evaluation length
.
