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Campbell-scientific Wireless Sensor Network (CWB100, CWS220, and CWS90 Manual de usuario Pagina 63

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Appendix B. Measurement Names and Meanings
The term,
(( ') ') /
Θ
ii
sNS
2
∑
, is 0 if the deviations in speed are not
correlated with the deviation in direction. This assumption has been verified in
tests on wind data by CSI; the Air Resources Laboratory, NOAA, Idaho Falls,
ID; and MERDI, Butte, MT. In these tests, the maximum differences in
σσ
()((')/) ()(( /))
//
ΘΘ Θ
uNuU
i
==
S
−
∑
212 1
21 and
2
have never been greater than a few degrees.
The final form is arrived at by converting from radians to degrees (57.296
degrees/radian).
σ
()(( /)) ( /)
//
Θ
uUS US
=− =−
21 811
12 12
B-7
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