[Geoserver-users] Dealing with edges of data for GeoServer LineSymbolizer

GeoServer GeoServer User
1

Hello all,

I posted this question 2 months ago on GIS stackexchange, but no answer. Hoping someone on here might know. Thanks for your time.

I am creating contour lines of the ocean using the GEBCO gridded bathy data tiff (depth every 15 arcsecs) and a SDL style with LineSymbolizer. All looks good apart from at the edge of the data where the contour lines close at the edges. Is there a way to get LineSymbolizer (and TextSymbolizer) not to render the isolines on the edge of the data?

enter image description here

<?xml version="1.0" encoding="ISO-8859-1"?>
<StyledLayerDescriptor version="1.0.0"
  xsi:schemaLocation=["http://www.opengis.net/sld StyledLayerDescriptor.xsd"](http://www.opengis.net/sldStyledLayerDescriptor.xsd)
  xmlns=["http://www.opengis.net/sld"](http://www.opengis.net/sld)
  xmlns:ogc=["http://www.opengis.net/ogc"](http://www.opengis.net/ogc)
  xmlns:xlink=["http://www.w3.org/1999/xlink"](http://www.w3.org/1999/xlink)
  xmlns:xsi=["http://www.w3.org/2001/XMLSchema-instance"](http://www.w3.org/2001/XMLSchema-instance)>
  <NamedLayer>
    <Name>contour_dem</Name>
    <UserStyle>
      <Title>Bathymetry Contours</Title>
      <Abstract>Bathymetry contours produced from the GEBCO 15 arc-second gridded bathymetry</Abstract>
      <FeatureTypeStyle>
        <Transformation>
          <ogc:Function name="ras:Contour">
            <ogc:Function name="parameter">
              <ogc:Literal>data</ogc:Literal>
            </ogc:Function>
            <ogc:Function name="parameter">
              <ogc:Literal>levels</ogc:Literal>
              <ogc:Literal>0</ogc:Literal>
              <ogc:Literal>-100</ogc:Literal>
              <ogc:Literal>-200</ogc:Literal>
              <ogc:Literal>-300</ogc:Literal>
              <ogc:Literal>-400</ogc:Literal>
              <ogc:Literal>-500</ogc:Literal>
              ...
              <ogc:Literal>-11000</ogc:Literal>
              <ogc:Literal>-12000</ogc:Literal>
            </ogc:Function>
          </ogc:Function>
        </Transformation>
        ...
        <Rule>
          <Name>low</Name>
          <Title>Low Res Contours</Title>
          <ogc:Filter>
            <ogc:Or>
              <ogc:PropertyIsEqualTo>
                <ogc:PropertyName>value</ogc:PropertyName>
                <ogc:Literal>-1000</ogc:Literal>
              </ogc:PropertyIsEqualTo>
              <ogc:PropertyIsEqualTo>
                <ogc:PropertyName>value</ogc:PropertyName>
                <ogc:Literal>-6000</ogc:Literal>
              </ogc:PropertyIsEqualTo>
            </ogc:Or>
          </ogc:Filter>
          <LineSymbolizer>
            <Stroke>
              <CssParameter name="stroke">#000000</CssParameter>
              <CssParameter name="stroke-width">1</CssParameter>
            </Stroke>
          </LineSymbolizer>
          <TextSymbolizer>
            <Label>
              <ogc:PropertyName>value</ogc:PropertyName>
            </Label>
            <Font>
              <CssParameter name="font-family">Arial</CssParameter>
              <CssParameter name="font-style">Normal</CssParameter>
              <CssParameter name="font-size">10</CssParameter>
            </Font>
            <LabelPlacement>
              <LinePlacement/>
            </LabelPlacement>
            <Halo>
              <Radius>
                <ogc:Literal>2</ogc:Literal>
              </Radius>
              <Fill>
                <CssParameter name="fill">#FFFFFF</CssParameter>
                <CssParameter name="fill-opacity">0.6</CssParameter>
              </Fill>
            </Halo>
            <Fill>
              <CssParameter name="fill">#000000</CssParameter>
            </Fill>
            <Priority>2000</Priority>
            <VendorOption name="followLine">true</VendorOption>
            <VendorOption name="repeat">100</VendorOption>
            <VendorOption name="maxDisplacement">50</VendorOption>
            <VendorOption name="maxAngleDelta">30</VendorOption>
          </TextSymbolizer>
        </Rule>
      </FeatureTypeStyle>
    </UserStyle>
  </NamedLayer>
</StyledLayerDescriptor>
2

Jack:

I expect this is not a case of if anyone knows, but if anyone has reported this as a feature request yet.

Thoughts:

  • Does the problem go away if you zoom in (is the problem just the edges of the dataset bounds, or is the problem at the end of the draw area).
  • If you set your layer bounds to less than the whole world, does the artifact still show up at the edge of the dataset? (Or edge of the draw area).
···

–
Jody Garnett