Windbarb SLD

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      <Name>windbarbs</Name>
      <UserStyle>
         <Title>windbarbs</Title>
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                  <ogc:Function name="parameter">
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                  <ogc:Function name="parameter">
                    <ogc:Literal>emisphere</ogc:Literal>
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                  <Graphic>
                     <Mark>
                       <WellKnownName>windbarbs://default(
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                          <ogc:Add>
                              <ogc:Mul>
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                                <ogc:PropertyName>u-component_of_wind_surface</ogc:PropertyName>
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                              <ogc:Mul>
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                                <ogc:PropertyName>v-component_of_wind_surface</ogc:PropertyName>
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                              <!-- Value to transform -->
                             <ogc:Function name="sqrt">
                              <ogc:Add>
                                <ogc:Mul>
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                                 <ogc:PropertyName>u-component_of_wind_surface</ogc:PropertyName>
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                                      <ogc:PropertyName>u-component_of_wind_surface</ogc:PropertyName>
                                    </ogc:Mul>
                                    <ogc:Mul>
                                      <ogc:PropertyName>v-component_of_wind_surface</ogc:PropertyName>
                                      <ogc:PropertyName>v-component_of_wind_surface</ogc:PropertyName>
                                    </ogc:Mul>
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                              </ogc:Function>

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                               <ogc:Literal>1.543333332</ogc:Literal>
                                <ogc:Function name="toDegrees">
                            <ogc:Function name="atan2">
                            <ogc:PropertyName>u-component_of_wind_surface</ogc:PropertyName>
                            <ogc:PropertyName>v-component_of_wind_surface</ogc:PropertyName>
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