[Geoserver-users] SLD 'sortBy' not working when points located at exact same position

[Pierric de Laborie]

Hi all,
I have a WMS based on a shapefile (points). Some of those points are
located at the exact same longitude and latitude. In that specific case, I
noticed that the Vendoroption sortby doesn't seem to operate. It seems to
just take the style of the last point located at that position in the
shapefile.
<VendorOption name="sortBy">FILE_TYPE A</VendorOption>

It seems to work fine in all other cases: when points are not located at
the exact same place, it successfully displays the 'video' point on top of
the 'photo' point.

Is there a mishap here or my understanding of that Vendoroption not correct?

I included here below the entire FeatureTypeStyle section

Thanks,
Pierric


 <?xml version="1.0" encoding="ISO-8859-1"?>
<StyledLayerDescriptor version="1.0.0"
                       xsi:schemaLocation="http://www.opengis.net/sld
http://schemas.opengis.net/sld/1.0.0/StyledLayerDescriptor.xsd";
                       xmlns="http://www.opengis.net/sld"; xmlns:ogc="
http://www.opengis.net/ogc";
                       xmlns:xlink="http://www.w3.org/1999/xlink";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>

  <NamedLayer>
    <Name>SLD_species_observations</Name>
    <UserStyle>
      <Title>azure square point style</Title>
      <FeatureTypeStyle>
        <Rule>
          <Title>Photo</Title>
          <ogc:Filter>
            <ogc:PropertyIsEqualTo>
              <ogc:PropertyName>FILE_TYPE</ogc:PropertyName>
              <ogc:Literal>photo</ogc:Literal>
            </ogc:PropertyIsEqualTo>
          </ogc:Filter>
          <PointSymbolizer>
            <Graphic>
              <Mark>
                <WellKnownName>circle</WellKnownName>
                <Fill>
                  <CssParameter name="fill">#FF0000</CssParameter>
                </Fill>
                <Stroke>
                  <CssParameter name="stroke">#000000</CssParameter>
                  <CssParameter name="stroke-width">1</CssParameter>
                </Stroke>
              </Mark>
              <Size>14</Size>
            </Graphic>
          </PointSymbolizer>

        </Rule>
        <Rule>
          <Title>Video</Title>
          <ogc:Filter>
            <ogc:PropertyIsEqualTo>
              <ogc:PropertyName>FILE_TYPE</ogc:PropertyName>
              <ogc:Literal>video</ogc:Literal>
            </ogc:PropertyIsEqualTo>
          </ogc:Filter>
          <PointSymbolizer>
            <Graphic>
              <Mark>
                <WellKnownName>circle</WellKnownName>
                <Fill>
                  <CssParameter name="fill">#FFFFFF</CssParameter>
                </Fill>
                <Stroke>
                  <CssParameter name="stroke">#FF0000</CssParameter>
                  <CssParameter name="stroke-width">6</CssParameter>
                </Stroke>
              </Mark>
              <Size>10</Size>
            </Graphic>
          </PointSymbolizer>
        </Rule>
        *<VendorOption name="sortBy">FILE_TYPE A</VendorOption>*
      </FeatureTypeStyle>
    </UserStyle>
  </NamedLayer>
</StyledLayerDescriptor>


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