[Geoserver-users] Wind arrows

[VILLARD, Pierre]

Hello,

I am not sure if I should use this mailing list to ask this question... correct 
me if I am wrong.

I have a geoTiff file containing U and V wind components in two separate bands 
and I am trying to display it on geoserver with arrows. I am on geoserver 2.6.2 
and I am following the indications here : 
http://geoserver.geo-solutions.it/edu/fr/wps/rendering_tx.html

I have added the following style :

    <StyledLayerDescriptor version="1.0.0"
      xmlns="http://www.opengis.net/sld"; xmlns:gml="http://www.opengis.net/gml";
      xmlns:ogc="http://www.opengis.net/ogc"; 
xmlns:xlink="http://www.w3.org/1999/xlink";
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
      xsi:schemaLocation="http://www.opengis.net/sld 
./StyledLayerDescriptor.xsd">
      <NamedLayer>
        <Name>contour_lines</Name>
        <UserStyle>
          <FeatureTypeStyle>
            <Transformation>
              <ogc:Function name="gs:RasterAsPointCollection">
                <ogc:Function name="parameter">
                  <ogc:Literal>data</ogc:Literal>
                </ogc:Function>
              </ogc:Function>
            </Transformation>
            <Rule>
              <TextSymbolizer>
                <Label><![CDATA[ ]]></Label> <!-- fake label -->
                <Graphic>
                  <Mark>
                    <WellKnownName>shape://carrow</WellKnownName>
                    <Fill>
                      <CssParameter name="fill">#000000</CssParameter>
                    </Fill>
                  </Mark>
                  <Size>
                    <ogc:Mul>
                    <ogc:Function name="sqrt">
                      <ogc:Add>
                        <ogc:Mul>
                          <ogc:PropertyName>Band1</ogc:PropertyName>
                          <ogc:PropertyName>Band1</ogc:PropertyName>
                        </ogc:Mul>
                        <ogc:Mul>
                          <ogc:PropertyName>Band2</ogc:PropertyName>
                          <ogc:PropertyName>Band2</ogc:PropertyName>
                        </ogc:Mul>
                      </ogc:Add>
                    </ogc:Function>
                    <ogc:Literal>200</ogc:Literal>
                    </ogc:Mul>
                  </Size>
                  <Rotation>
                     <ogc:Function name="toDegrees">
                       <ogc:Function name="atan2">
                            <ogc:PropertyName>Band2</ogc:PropertyName>
                            <ogc:PropertyName>Band1</ogc:PropertyName>
                       </ogc:Function>
                    </ogc:Function>
                  </Rotation>
                </Graphic>
                <Priority>
                  <ogc:Add>
                    <ogc:Mul>
                      <ogc:PropertyName>Band1</ogc:PropertyName>
                      <ogc:PropertyName>Band1</ogc:PropertyName>
                    </ogc:Mul>
                    <ogc:Mul>
                      <ogc:PropertyName>Band2</ogc:PropertyName>
                      <ogc:PropertyName>Band2</ogc:PropertyName>
                    </ogc:Mul>
                  </ogc:Add>
                </Priority>
              </TextSymbolizer>
            </Rule>
          </FeatureTypeStyle>
        </UserStyle>
      </NamedLayer>
    </StyledLayerDescriptor>

And when I added my layer, I renamed the two bands in Band1 and Band2 and 
selected the style.

But when previewing the layer, it stays desperately blank without any error 
message.

Do you have any idea where I should look for to solve this issue ?

Thanks !
Pierre.
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