Kipp&Zonen COMBILOG Data Logger - Manual (Page 170)

Standard deviation
s
x
x
n
n
=
−
∑
∑
−
²
( )²
1
Vector mean value of wind direction (VecD) and wind
speed (VecV)
The components of the horizontal wind vector
( ) 
u WV WD , are
given as single values, with
WV - wind speed
WD - wind direction
The single components of the wind vector are determined by:
( )
u WV WD
1
= * cos
( )
u WV WD
2
= * sin
The mean values are subsequently gained by:
u
n
u i
i
n
1 1
1
1
=
=
∑
u
n
u i
i
n
2 2
1
1
=
=
∑
with i = Summation index
n = Number of single values within averaging period
Hardware Manual COMBILOG 1022 170