Kipp&Zonen COMBILOG Data Logger - Manual (Page 171)

WV u u = +
1
2
2
2
WD ′ = arctan
u
u
2
1
with 0 90 ° ≤ ′ ≤ ° WD
As u
1
and u
2
may also be relative and arctan is only defined for a
range 0°...90°, the true direction angle WD is determined by fol-
lowing table:
u
1
+ - - +
u
2
+ + - -
WD ′ WD ′ 180 ° − ′ WD 180 ° + ′ WD 360 ° − ′ WD
For u
1
0 =
, WD = ° 0 is defined.
Hardware Manual COMBILOG 1022
171