Campbell Scientific Wireless Sensor Network (CWB100, CWS220, and CWS900) User Manual
Page 63
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Appendix B. Measurement Names and Meanings
The term,
((
')
') /
Θ
i
i
s
NS
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
σ
σ
(
) (
(
') /
)
(
) ( (
/ ))
/
/
Θ
Θ
Θ
u
N
u
U
i
=
=
S
−
∑
2
1 2
1
2 1
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
(
)
( (
/ ))
(
/ )
/
/
Θu
U S
U S
=
−
=
−
2 1
81 1
1 2
1 2
B-7
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