Halytech
hydroSpider2 User’s Manual v1.23
Page 34
5.5.3.4
Wind Speed and Direction
When
Wind Speed Vector Avg
or
Wind Direction Vector Avg
is selected as the source for a super
channel, the instantaneous wind speed and direction inputs can then be chosen via the super
channel’s advanced input options dialog:
The direction input channel should be calibrated in degrees, to ensure that the transition between
360 and 0 degrees is correctly handled.
The
Sampling period
specifies how often the inputs are sampled to calculate the average.
For example, with 10 minute logging and 1 minute sampling, 10 readings, each 1 minute apart, will
be used to calculate each average value.
The sampling period must be faster than the super channel's logging period. The sampling or logging
period of the input channels will be adjusted automatically as required by the super-channel's
sampling period.
When
Wind Direction Average
or
Wind Direction Sigma Theta
(standard deviation, using the
Yamartino method) is selected as the source for a super channel, the options dialog is the same as
shown above, except that the wind speed input is omitted because only wind direction is utilised by
these two methods.
