Campbell-scientific Wireless Sensor Network (CWB100, CWS220, and CWS90 Manuel d'utilisateur télécharger pdf (Page 63)

Appendix B. Measurement Names and Meanings

The term,

(( ') ') /

sNS

∑

, 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

−

∑

212 1

21 and

have never been greater than a few degrees.

The final form is arrived at by converting from radians to degrees (57.296

degrees/radian).

()(( /)) ( /)

uUS US

=− =−

21 811

12 12

B-7

1 2 ... 58 59 60 61 62 63 64 65 66 67 68 69 70

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Campbell-scientific Wireless Sensor Network (CWB100, CWS220, and CWS90 Manuel d'utilisateur Page 63