## Average Wind Direction & Speed

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• I have a question regarding how Wuhu calculates average wind direction and speed. As far as I can tell, each has two ways: Average direction can be based on
Message 1 of 4 , Jul 7, 2009
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I have a question regarding how Wuhu calculates average wind direction and speed.
As far as I can tell, each has two ways:

Average direction can be based on vector addition including wind speed (in other words weighted by windspeed) or using unit length (that is unweighted by wind speed).

For average wind speed, it can be a simple time average; or it can be a vector based average.

How does Wuhu calculate it?  Or is it configurable?

I found this page (http://www.webmet.com/met_monitoring/62.html), which frankly has more detail than I can get through, but its vector and unit vector descriptions are what I mean, in more formal ways.
• Initially, a long time ago, it was using vectors. Eventually, I just averaged with wind speed (no including zero wind speeds unless you check an option). I
Message 2 of 4 , Jul 8, 2009
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Initially, a long time ago, it was using vectors.

Eventually, I just averaged with wind speed (no including zero wind speeds unless you check an option).

I cannot recally why the vector approach was abandoned. When I find some time I could make it configurable.

Would you want to use the vector approach or just simple averaging?

Thanks.

--- In wuhu_software_group@yahoogroups.com, David Lipper <glenvilleweather@...> wrote:
>
> I have a question regarding how Wuhu calculates average wind direction and
> speed.
> As far as I can tell, each has two ways:
>
> Average direction can be based on vector addition including wind speed (in
> other words weighted by windspeed) or using unit length (that is unweighted
> by wind speed).
>
> For average wind speed, it can be a simple time average; or it can be a
> vector based average.
>
> How does Wuhu calculate it? Or is it configurable?
>
> frankly has more detail than I can get through, but its vector and unit
> vector descriptions are what I mean, in more formal ways.
>
• Actually, I would like simple averaging for wind speed (I guess it does that now), including calm (0 mph) samples. Which setting controls this? I would like
Message 3 of 4 , Jul 8, 2009
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Actually, I would like simple averaging for wind speed (I guess it does
that now), including calm (0 mph) samples. Which setting controls this?

I would like the vector addition for wind direction (i.e. weighted by
wind speed of each sample).

wuhu_software wrote:
>
>
>
> Initially, a long time ago, it was using vectors.
>
> Eventually, I just averaged with wind speed (no including zero wind
> speeds unless you check an option).
>
> I cannot recally why the vector approach was abandoned. When I find
> some time I could make it configurable.
>
> Would you want to use the vector approach or just simple averaging?
>
> Thanks.
>
> --- In wuhu_software_group@yahoogroups.com
> <mailto:wuhu_software_group%40yahoogroups.com>, David Lipper
> <glenvilleweather@...> wrote:
> >
> > I have a question regarding how Wuhu calculates average wind
> direction and
> > speed.
> > As far as I can tell, each has two ways:
> >
> > Average direction can be based on vector addition including wind
> speed (in
> > other words weighted by windspeed) or using unit length (that is
> unweighted
> > by wind speed).
> >
> > For average wind speed, it can be a simple time average; or it can be a
> > vector based average.
> >
> > How does Wuhu calculate it? Or is it configurable?
> >
> <http://www.webmet.com/met_monitoring/62.html>), which
> > frankly has more detail than I can get through, but its vector and unit
> > vector descriptions are what I mean, in more formal ways.
> >
>
>
• I believe the direction is calculated using the vectors. There in an option under the tweaks screen to include zero wind speed. This requires the latest
Message 4 of 4 , Jul 9, 2009
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I believe the direction is calculated using the vectors.

There in an option under the tweaks screen to include zero wind speed. This requires the latest version.

--- In wuhu_software_group@yahoogroups.com, David Lipper <glenvilleweather@...> wrote:
>
> Actually, I would like simple averaging for wind speed (I guess it does
> that now), including calm (0 mph) samples. Which setting controls this?
>
> I would like the vector addition for wind direction (i.e. weighted by
> wind speed of each sample).
>
> wuhu_software wrote:
> >
> >
> >
> > Initially, a long time ago, it was using vectors.
> >
> > Eventually, I just averaged with wind speed (no including zero wind
> > speeds unless you check an option).
> >
> > I cannot recally why the vector approach was abandoned. When I find
> > some time I could make it configurable.
> >
> > Would you want to use the vector approach or just simple averaging?
> >
> > Thanks.
> >
> > --- In wuhu_software_group@yahoogroups.com
> > <mailto:wuhu_software_group%40yahoogroups.com>, David Lipper
> > <glenvilleweather@> wrote:
> > >
> > > I have a question regarding how Wuhu calculates average wind
> > direction and
> > > speed.
> > > As far as I can tell, each has two ways:
> > >
> > > Average direction can be based on vector addition including wind
> > speed (in
> > > other words weighted by windspeed) or using unit length (that is
> > unweighted
> > > by wind speed).
> > >
> > > For average wind speed, it can be a simple time average; or it can be a
> > > vector based average.
> > >
> > > How does Wuhu calculate it? Or is it configurable?
> > >