Combining Wind Direction and Wind Speed Data into Wind Barb

[John Schattel]

I am retrieving wind data from a Web Feature Service.  I'd like to
combine the wind speed data and wind direction data into a wind barb as
shown below:

http://ww2010.atmos.uiuc.edu/(Gh)/guides/maps/sfcobs/wnd.rxml

Can I do this with Udig?  If so, how would I go about merging the two
data sets into the one graphic.

In advance, thanks for any help you can provide.

John

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The contents of this message are mine personally and do not necessarily reflect any position of NOAA.

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[Jesse Eichar-2]

Hi,

There are two ways to do this.  Implementing a MapGraphic is probably  
the easiest.  Create a MapGraphic extension that draws the wind speed/
barb.

The other way is complicated but I'll quickly throw it out just to be  
complete.  You make a IService for the wind data/ wind direction  
(maybe one for each).  Then implement a Renderer for drawing them.  
Sounds simple but really it will be around 10 classes.

Jesse

On 11-Aug-08, at 10:46 PM, John Schattel wrote:

> I am retrieving wind data from a Web Feature Service.  I'd like to  
> combine the wind speed data and wind direction data into a wind barb  
> as shown below:
>
> http://ww2010.atmos.uiuc.edu/(Gh)/guides/maps/sfcobs/wnd.rxml
>
> Can I do this with Udig?  If so, how would I go about merging the  
> two data sets into the one graphic.
>
> In advance, thanks for any help you can provide.
>
> John
>
> --
> John.Schattel@...
> [phone] x111
>
> The contents of this message are mine personally and do not  
> necessarily reflect any position of NOAA.
>
> _______________________________________________
> udig-users mailing list
> udig-users@...
> http://lists.refractions.net/mailman/listinfo/udig-users

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[Jody Garnett]

Thanks for the excellent summary of options; while the "style layer
descriptor" specification we use for rendering vector data is very
complete - wind barbs are a very hard problem :-) As are cold fronts and
a host of other interesting weather related symbology.

Since you asked on the user list I will have to say no - uDig cannot
render wind barbs. We would love to see the functionality developed -
and would be pleased to start you out in a good direction.

Jody

Jesse Eichar wrote:

> Hi,
>
> There are two ways to do this.  Implementing a MapGraphic is probably
> the easiest.  Create a MapGraphic extension that draws the wind
> speed/barb.
>
> The other way is complicated but I'll quickly throw it out just to be
> complete.  You make a IService for the wind data/ wind direction
> (maybe one for each).  Then implement a Renderer for drawing them.  
> Sounds simple but really it will be around 10 classes.
>
> Jesse
>
> On 11-Aug-08, at 10:46 PM, John Schattel wrote:
>
>> I am retrieving wind data from a Web Feature Service.  I'd like to
>> combine the wind speed data and wind direction data into a wind barb
>> as shown below:
>>
>> http://ww2010.atmos.uiuc.edu/(Gh)/guides/maps/sfcobs/wnd.rxml
>>
>> Can I do this with Udig?  If so, how would I go about merging the two
>> data sets into the one graphic.
>>
>> In advance, thanks for any help you can provide.
>>
>> John
>>
>> --
>> John.Schattel@...
>> [phone] x111
>>
>> The contents of this message are mine personally and do not
>> necessarily reflect any position of NOAA.
>>
>> _______________________________________________
>> udig-users mailing list
>> udig-users@...
>> http://lists.refractions.net/mailman/listinfo/udig-users
>
> _______________________________________________
> udig-users mailing list
> udig-users@...
> http://lists.refractions.net/mailman/listinfo/udig-users

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[Paul Ramsey]

Why not? Do I misunderstand? Mapserver can do it.. it just takes a lot
of rules, and the ability to do rotated symbols.  So you feed
windspeed into a set of 5-6 rules that choose a symbols with the right
number of barbs, then rotate that symbol based on the wind direction,
voila.

What's uDig / SLD missing? The rotation-based-on-attribute part?

P.

On Tue, Aug 12, 2008 at 4:27 PM, Jody Garnett <jgarnett@...> wrote:

> Thanks for the excellent summary of options; while the "style layer
> descriptor" specification we use for rendering vector data is very complete
> - wind barbs are a very hard problem :-) As are cold fronts and a host of
> other interesting weather related symbology.
>
> Since you asked on the user list I will have to say no - uDig cannot render
> wind barbs. We would love to see the functionality developed - and would be
> pleased to start you out in a good direction.
>
> Jody
>
> Jesse Eichar wrote:
>>
>> Hi,
>>
>> There are two ways to do this.  Implementing a MapGraphic is probably the
>> easiest.  Create a MapGraphic extension that draws the wind speed/barb.
>>
>> The other way is complicated but I'll quickly throw it out just to be
>> complete.  You make a IService for the wind data/ wind direction (maybe one
>> for each).  Then implement a Renderer for drawing them.  Sounds simple but
>> really it will be around 10 classes.
>>
>> Jesse
>>
>> On 11-Aug-08, at 10:46 PM, John Schattel wrote:
>>
>>> I am retrieving wind data from a Web Feature Service.  I'd like to
>>> combine the wind speed data and wind direction data into a wind barb as
>>> shown below:
>>>
>>> http://ww2010.atmos.uiuc.edu/(Gh)/guides/maps/sfcobs/wnd.rxml
>>>
>>> Can I do this with Udig?  If so, how would I go about merging the two
>>> data sets into the one graphic.
>>>
>>> In advance, thanks for any help you can provide.
>>>
>>> John
>>>
>>> --
>>> John.Schattel@...
>>> [phone] x111
>>>
>>> The contents of this message are mine personally and do not necessarily
>>> reflect any position of NOAA.
>>>
>>> _______________________________________________
>>> udig-users mailing list
>>> udig-users@...
>>> http://lists.refractions.net/mailman/listinfo/udig-users
>>
>> _______________________________________________
>> udig-users mailing list
>> udig-users@...
>> http://lists.refractions.net/mailman/listinfo/udig-users
>
> _______________________________________________
> udig-users mailing list
> udig-users@...
> http://lists.refractions.net/mailman/listinfo/udig-users
>

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[Jody Garnett]

Paul Ramsey wrote:
> Why not? Do I misunderstand? Mapserver can do it.. it just takes a lot
> of rules, and the ability to do rotated symbols.  So you feed
> windspeed into a set of 5-6 rules that choose a symbols with the right
> number of barbs, then rotate that symbol based on the wind direction,
> voila.
>
> What's uDig / SLD missing? The rotation-based-on-attribute part?
>  
I see your point Paul - we can in fact rotate the symbol based on an
attribute.

My understanding is that SLD was not up to the task; but perhaps I was
thinking if cold front / warm fronts (where the rules are even stranger).

What do we actually need for this one:
1) a website with the symbols as PNG or GIF files
2) a source of data (WFS?)
3) an SLD file with
- a rule for each symbol type
- PointSymbolizers drawing the symbol in the correct location, correct
orientation, color
- TextSymbolizer to postion those two wind speeds

Doing a quick web search I find a geoserver user has constructed
something like this already:
-
http://www.nabble.com/-Geoserver-devel--Re:-Wind-Barbs,-Contouring,-and-SLD-td434264.html

Seems a bit old however; and the example does not show an Expression for
the <Rotation>; but it may be a good starting point.
Jody
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[Jody Garnett]

Here is another interesting email from Gary:
- http://osdir.com/ml/gis.geotools2.user/2006-11/msg00025.html

Looking at:
-
http://www.newmediastudio.org/DataDiscovery/Hurr_ED_Center/Satellites_and_Sensors/QuikSCAT/QuikSCAT_fig6.gif

Looks like it may be some fun modal math to select the correct flags(s)
to draw.
Jody

Paul Ramsey wrote:
> Why not? Do I misunderstand? Mapserver can do it.. it just takes a lot
> of rules, and the ability to do rotated symbols.  So you feed
> windspeed into a set of 5-6 rules that choose a symbols with the right
> number of barbs, then rotate that symbol based on the wind direction,
> voila.
>
> What's uDig / SLD missing? The rotation-based-on-attribute part?
> P.
>  

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