Campbell Scientific CR200/CR200X-series Dataloggers - Manual (Page 135)

Section 11. Programming Resource Library
11.5.2.2.2 Mean Wind Vector
Resultant mean horizontal wind speed, Ū:
Figure 46: Mean Wind Vector
where for polar sensors:
or, in the case of orthogonal sensors:
Resultant mean wind direction, Θu:
Standard deviation of wind direction, σ (Θu), using Campbell Scientific
algorithm:
The algorithm for σ (Θu) is developed by noting ( FIGURE. Standard Deviation
of Direction (p. 124)) that
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