Using Conditional Statement - SLD GeoServer - based on scale

Question

Is there any way to use the conditional statement in SLD based on scale to set parameter for example:

• for scale between 25001 and 50 000 set size 15
• for scale between 5001 and 25 000 set size 28
• for scale between 400 and 5000 set size 40

I have rule like this

<Name>Test</Name>
<UserStyle>
  <Title>Test</Title>
  <FeatureTypeStyle>

    <Rule>
      <Title>Test</Title>
      <MaxScaleDenominator>50000</MaxScaleDenominator>
      <Filter>
        <PropertyIsEqualTo>
          <PropertyName>value1</PropertyName>
          <Literal>1</Literal>
        </PropertyIsEqualTo>
      </Filter>
      <PolygonSymbolizer>
        <Fill>
          <GraphicFill>
            <Graphic>
              <Mark>
                <WellKnownName>shape://slash</WellKnownName>
                <Stroke>
                  <CssParameter name="stroke">#004d26</CssParameter>
                  <CssParameter name="stroke-width">3</CssParameter>          
                </Stroke>
   
              </Mark>
              <Size>15</Size> <!--  tighter pattern -->
            </Graphic>
          </GraphicFill>
          <CssParameter name="fill-opacity"> 
            <ogc:Function name="env">
              <ogc:Literal>geom_fill_opacity</ogc:Literal>
              <ogc:Literal>0.6</ogc:Literal>
            </ogc:Function>
          </CssParameter>  
        </Fill>
        <Stroke>
          <CssParameter name="stroke">#004d26</CssParameter>
          <CssParameter name="stroke-width">0.2</CssParameter>
          <CssParameter name="stroke-opacity">
            <ogc:Function name="env">
              <ogc:Literal>geom_stroke_opacity</ogc:Literal>
              <ogc:Literal>1</ogc:Literal>
            </ogc:Function>
          </CssParameter>

        </Stroke>
      </PolygonSymbolizer>
    </Rule>
   

Answer 1

In GeoServer 2.20 you can mark a rule for usage just in the map, or just in the legend:

https://docs.geoserver.org/latest/en/user/styling/sld/extensions/rendering-selection.html

Set the two rules you want to hide as "mapOnly" and they should disappear from the legend.

Answer 2

No, each rule with it's scale dependencies is independent of the other rules so you can simply specify the size (or colour or whatever) in that rule.

If having multiple rules causes issue for your legend then pass in the scale to the getLegend request as described in the manual.