[GIS] GeoServer Transformation Function (Categorize) Problem

geoserverogcsld

I'm trying run three filter functions(Recode,Categorize,Interpolate) described at the bottom of this page
http://docs.geoserver.org/stable/en/user/filter/function_reference.html

Recode and Interpolate works fine but Categorize throws me the following exception message. 'java.lang.RuntimeException: Unable to find function Categorize'

What could cause this problem ? Am I supposed to install a plugin on geoserver or what?

The official examples are on
http://docs.geoserver.org/stable/en/user/styling/sld-tipstricks/transformation-func.html

Best Answer

The question is old, but I had the same issue. For me the problem was the style definition, I was missing the last value for the ranges; with respect to the example in the Geoserver documentation,

     <ogc:Literal>#87CEEB</ogc:Literal>
     <ogc:Literal>20</ogc:Literal>
     <ogc:Literal>#FFFACD</ogc:Literal>
     <ogc:Literal>100</ogc:Literal>
     <ogc:Literal>#F08080</ogc:Literal>   <!-- I was misisng a line :) -->

Related Solutions

[GIS] How to use the SLD Filter “Difference”

Try this,

<PolygonSymbolizer>
          <Geometry>
        <ogc:Function name="difference">    
          <ogc:PropertyName>geom</ogc:PropertyName>
          <ogc:Function name="buffer">
            <ogc:PropertyName>geom</ogc:PropertyName>
            <ogc:Literal>-50</ogc:Literal>
          </ogc:Function>
          </ogc:Function>
          </Geometry>
          <Fill>
          <CssParameter name="fill">#894465</CssParameter>
          <CssParameter name="fill-opacity">0.5</CssParameter>  
        </Fill>
      </PolygonSymbolizer>

It works in geoserver 2.7-SNAPSHOT (rev 38562)

GeoServer 2.2 – How to Style Mixed Geometry Types Effectively

The first validation error is because you are missing Name, Title, Abstract, NamedLayer and UserLayer elements in your SLD. The second validation error refers to the missing filter element inside your Rule element. So if you add the filter element and the standard elements in the sld elemet your SLD should validate fine. Finally our SLD should look like this:

<?xml version="1.0" encoding="ISO-8859-1"?>
<StyledLayerDescriptor version="1.0.0" 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"
  xsi:schemaLocation="http://www.opengis.net/sld http://schemas.opengis.net/sld/1.0.0/StyledLayerDescriptor.xsd">
  <NamedLayer>
    <Name></Name>
    <UserStyle>
      <Title></Title>
      <Abstract></Abstract>
      <FeatureTypeStyle>
        <Rule>
            <ogc:Filter>        
                <ogc:PropertyIsEqualTo>
                    <ogc:Function name="geometryType">
                        <ogc:PropertyName>the_geom</ogc:PropertyName>
                    </ogc:Function>
                    <ogc:Literal>Polygon</ogc:Literal>
                </ogc:PropertyIsEqualTo>
            </ogc:Filter>    
            <PolygonSymbolizer>
            <Stroke>
                <CssParameter name="stroke">#0000ff</CssParameter>
                <CssParameter name="stroke-width">1</CssParameter>
            </Stroke>
            </PolygonSymbolizer>
        </Rule>
      </FeatureTypeStyle>
    </UserStyle>
  </NamedLayer>
</StyledLayerDescriptor>

If you want to style other geometrytypes - just create a new rule with the symbolizer and geometrytype filter you want to style.

UPDATE

Your point rule should have a PointSymbolizer element instead of the PolygonSymbolizer. So your point rule look like this:

 <Rule>
        <ogc:Filter>        
            <ogc:PropertyIsEqualTo>
                <ogc:Function name="geometryType">
                    <ogc:PropertyName>the_geom</ogc:PropertyName>
                </ogc:Function>
                <ogc:Literal>Point</ogc:Literal>
            </ogc:PropertyIsEqualTo>
        </ogc:Filter>    
        <PointSymbolizer>
        <Graphic>
              <Mark>
                <WellKnownName>circle</WellKnownName>
                <Stroke>
                  <CssParameter name="stroke">#0000ff</CssParameter>
                  <CssParameter name="stroke-width">2</CssParameter>
                </Stroke>
              </Mark>
              <Size>6</Size>
            </Graphic>
        </PointSymbolizer>
    </Rule>

See more on how to style points in the GeoServer SLD Cookbook

Best Answer

Related Solutions

[GIS] How to use the SLD Filter “Difference”

GeoServer 2.2 – How to Style Mixed Geometry Types Effectively

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