Hi! I've got a question about using the RasterSymbolizer in and SLD. Is
it possible to use both a ColorMap as well as the ContrastEnhancement
feature at the same time? When I try to combine both, I get a validation
error (and no images are generated via WMS requests) but I'm unsure exactly
what the error means.
The underlying dataset in this case is a GeoTIFF where pixels contain
temperature values.
The SLD that is working is:
<?xml version="1.0" encoding="UTF-8"?>
<sld:StyledLayerDescriptor xmlns="http://www.opengis.net/sld"; xmlns:sld="
http://www.opengis.net/sld"; xmlns:ogc="http://www.opengis.net/ogc";
xmlns:gml="http://www.opengis.net/gml"; version="1.0.0">
<sld:NamedLayer>
<sld:Name>ncep_air_temperature_current_month_forecast_average</sld:Name>
<sld:UserStyle>
<sld:Name>ncep_air_temperature_current_month_forecast_average</sld:Name>
<sld:Title>ncep_air_temperature_current_month_forecast_average</sld:Title>
<sld:FeatureTypeStyle>
<sld:Name>name</sld:Name>
<sld:Rule>
<sld:RasterSymbolizer>
<ColorMap>
<ColorMapEntry quantity='-50' label='-50 ºC' color='#3B4CC0'
/>
<ColorMapEntry quantity="-30" label="-30 ºC" color="#3B4CC0"
/>
(... snipping many other values ...)
<ColorMapEntry quantity="28.125" label="28.125 ºC"
color="#C0282F" />
<ColorMapEntry quantity="30" label="30 ºC" color="#B4426" />
</ColorMap>
</sld:RasterSymbolizer>
</sld:Rule>
</sld:FeatureTypeStyle>
</sld:UserStyle>
</sld:NamedLayer>
</sld:StyledLayerDescriptor>
What I'd like to try out is:
<?xml version="1.0" encoding="UTF-8"?>
<sld:StyledLayerDescriptor xmlns="http://www.opengis.net/sld"; xmlns:sld="
http://www.opengis.net/sld"; xmlns:ogc="http://www.opengis.net/ogc";
xmlns:gml="http://www.opengis.net/gml"; version="1.0.0">
<sld:NamedLayer>
<sld:Name>ncep_air_temperature_current_month_forecast_average</sld:Name>
<sld:UserStyle>
<sld:Name>ncep_air_temperature_current_month_forecast_average</sld:Name>
<sld:Title>ncep_air_temperature_current_month_forecast_average</sld:Title>
<sld:FeatureTypeStyle>
<sld:Name>name</sld:Name>
<sld:Rule>
<sld:RasterSymbolizer>
<ContrastEnhancement>
<Histogram/>
</ContrastEnhancement>
<ColorMap>
<ColorMapEntry quantity='-50' label='-50 ºC' color='#3B4CC0'
/>
<ColorMapEntry quantity="-30" label="-30 ºC" color="#3B4CC0"
/>
(... snip many other entries...)
<ColorMapEntry quantity="28.125" label="28.125 ºC"
color="#C0282F" />
<ColorMapEntry quantity="30" label="30 ºC" color="#B4426" />
</ColorMap>
</sld:RasterSymbolizer>
</sld:Rule>
</sld:FeatureTypeStyle>
</sld:UserStyle>
</sld:NamedLayer>
</sld:StyledLayerDescriptor>
When I try this, I get this validation error:
line 15: cvc-complex-type.2.4.a: Invalid content was found starting with
element 'ColorMap'. One of '{"http://www.opengis.net/sld":ShadedRelief, "
http://www.opengis.net/sld":ImageOutline}' is expected.
I can understand that an explicit color map along with a histogram may not
make sense, but wanted to give it a try and wasn't quite sure how to
interpret this error message.
Relevant version information:
Geoserver Version - 2.7-SNAPSHOT
Git Revision - 98c8cdc76eaca4d97043edbe2590927dd12fc4a8
Build Date - 04-Oct-2015 13:52
GeoTools Version - 13-SNAPSHOT (rev
c93ba46e2f17bc598279d80722b66d14f7877fe7)
GeoWebCache Version - 1.7-SNAPSHOT (rev
00c39227c0fb6d9a7d0b347ae4875dad457de69b/00c39227c0fb6d9a7d0b347ae4875dad457de69b)
--
*Bruce Crevensten*
*Senior Software Engineer*
(SNAP) Scenarios Network for Alaska & Arctic Planning
www.snap.uaf.edu
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