[Geoserver-users] SLD styling for negative values

[Jan Peters]

Dear list,

sorry for cross-posting (see also: http://tinyurl.com/nwxvew6) but I am stuck. I am trying to style negative values in Geoserver via SLD and would like to know how the syntax in SLD should look like to do this. What I have is the following:

 

---snip---
<?xml version="1.0" encoding="UTF-8"?>
<StyledLayerDescriptor xmlns="http://www.opengis.net/sld" xmlns:ogc="http://www.opengis.net/ogc" xmlns:xsi="http://www.w3.org/2001/XMLSchema- instance" version="1.1.0" xmlns:xlink="http://www.w3.org/1999/xlink"   xsi:schemaLocation="http://www.opengis.net/sld   http://schemas.opengis.net/sld/1.1.0/StyledLayerDescriptor.xsd"   xmlns:se="http://www.opengis.net/se">
 <NamedLayer>
<se:Name>trnsfrm_meta_outputmap</se:Name>
<UserStyle>
  <se:Name>trnsfrm_meta_outputmap</se:Name>
  <se:FeatureTypeStyle>
    <se:Rule>
      <se:Name>-0.8290 - -0.4632</se:Name>
      <se:Description>
        <se:Title>-0.8290 - -0.4632</se:Title>
      </se:Description>
      <ogc:Filter xmlns:ogc="http://www.opengis.net/ogc">
        <ogc:And>
          <ogc:PropertyIsGreaterThan>
            <ogc:PropertyName>percentage_change</ogc:PropertyName>
            <ogc:Literal>-<ogc:Literal>0.828977</ogc:Literal>
            </ogc:Literal>
          </ogc:PropertyIsGreaterThan>
          <ogc:PropertyIsLessThanOrEqualTo>
            <ogc:PropertyName>percentage_change</ogc:PropertyName>
            <ogc:Literal>-<ogc:Literal>0.463182</ogc:Literal>
            </ogc:Literal>
          </ogc:PropertyIsLessThanOrEqualTo>
        </ogc:And>
      </ogc:Filter>
      <se:PolygonSymbolizer>
        <se:Fill>
          <se:SvgParameter name="fill">#0000ff</se:SvgParameter>
        </se:Fill>
        <se:Stroke>
          <se:SvgParameter name="stroke">#000000</se:SvgParameter>
          <se:SvgParameter name="stroke-width">0.26</se:SvgParameter>
          <se:SvgParameter name="stroke-linejoin">bevel</se:SvgParameter>
        </se:Stroke>
      </se:PolygonSymbolizer>
    </se:Rule>
  ---snip---

 

But this throws an error in Geoserver:

 

Caused by: org.postgresql.util.PSQLException: ERROR: invalid input syntax for type numeric: "-"
    Position: 406

I already tried to change the SLD from this

 

<ogc:Literal>-<ogc:Literal>0.828977</ogc:Literal></ogc:Literal>

 

to this:

 

<ogc:Literal>-0.828977</ogc:Literal>

 

But this doesn't work either (Geoserver tells me that my SLD is not valid). I also reduced the number of rows in the PostGIS table to one and tried positive and negative values for the respective field, the error is always the same so I suspect a problem with the SLD.

 

So my question is: What is the correct way of styling negative values in SLD? Or do I have to look for something else that I have not thougt of so far?

 

Thanks in advance an best regards

Jan

 

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