If this can be done could anyone point me in direction of an example please?
I've gone through various links etc. but not finding anything so far that 
relates this to a raster DEM.
I have a 32bit DEM for Ireland and use the below style as its colour ramp which 
all seems to work fine on a global scale.
There's 255 ColorMap levels but only start and end shown below.

The issue is that viewing the DEM globally is fine but locally I think more 
detail can be discerned if a dynamic style was possible.
For example looking at the global DEM the highest point should be red and the 
lowest blue and everything else in between should slot into a ramp level.
But when we query this WMS with an extent constraint is it possible to set a 
dynamic style such that red still defines the highest point in the region and 
blue the lowest with the rest following a ramp?

<sld:Title/>
      <sld:FeatureTypeStyle>
        <sld:Name>name</sld:Name>
        <sld:FeatureTypeName>Feature</sld:FeatureTypeName>
        <sld:Rule>
          <sld:MinScaleDenominator>8000</sld:MinScaleDenominator>
          <sld:RasterSymbolizer>
            <sld:Geometry>
              <ogc:PropertyName>grid</ogc:PropertyName>
            </sld:Geometry>
            <sld:ColorMap>
              <sld:ColorMapEntry label="-26.3560" color="#2c7bb6" 
quantity="-26.355951309203999"/>
              <sld:ColorMapEntry label="1.1691" color="#2e7cb7" 
quantity="1.1691155897985155"/>
              <sld:ColorMapEntry label="2.4462" color="#307eb8" 
quantity="2.4462433510857444"/>
              .
              .
              <sld:ColorMapEntry label="417.3692" color="#d92220" 
quantity="417.36918553683171"/>
              <sld:ColorMapEntry label="447.8075" color="#d9201f" 
quantity="447.80745853991777"/>
              <sld:ColorMapEntry label="489.2119" color="#d81e1e" 
quantity="489.21194792393862"/>
              <sld:ColorMapEntry label="550.2034" color="#d81b1d" 
quantity="550.20335811619361"/>
              <sld:ColorMapEntry label="893.3701" color="#d7191c" 
quantity="893.37005420883747"/>
            </sld:ColorMap>
          </sld:RasterSymbolizer>
        </sld:Rule>
        <sld:VendorOption name="composite">multiply</sld:VendorOption>
      </sld:FeatureTypeStyle>
    </sld:UserStyle>
  </sld:UserLayer>
</sld:StyledLayerDescriptor>


Thanks,


Paul
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