[mapserver-users] SLD with colour ramp in WMS GetMap

[Luís de Sousa]

Hello everyone,

I have a raster layer with the following range of values:

$ gdalinfo -hist my_data.tiff
[...]
    STATISTICS_MAXIMUM=128.30499267578
    STATISTICS_MEAN=6.3870258293789
    STATISTICS_MINIMUM=-9.5671482086182
    STATISTICS_STDDEV=11.960967394892

This is layer is being published through Mapserver and I get perfectly
correct maps through WMS.

Now I'd like to style the maps retrieved by mapserver using the SLD
parameter of the GetMap request. I'm starting with the basic example in the
SLD Cookbook [1]:

<?xml version="1.0" encoding="UTF-8"?>
<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>my_data</Name>
     <UserStyle>
      <Title>SLD Cook Book: Two color gradient</Title>
      <FeatureTypeStyle>
        <Rule>
          <RasterSymbolizer>
            <ColorMap>
              <ColorMapEntry color="#008000" quantity="-10" />
              <ColorMapEntry color="#663333" quantity="130" />
            </ColorMap>
          </RasterSymbolizer>
        </Rule>
      </FeatureTypeStyle>
    </UserStyle>
  </NamedLayer>
</StyledLayerDescriptor>

When I issue a request with this SLD file:

http://my.server/cgi-bin/mapserv?map=/var/www/file.map&VERSION=1.1.1&REQUEST=GetMap&LAYERS=my_data&SRS=EPSG:3857&BBOX=497600,6784100,498900,6786500&WIDTH=300&HEIGHT=600&FORMAT=image/gif&SLD=http://my.server/SLD/my_data.sld

I'm getting back simply a green patch (see the file my_data_SLD.gif).
Whereas without the SLD argument the features in the file are quite visible
(my_data.gif).

<http://osgeo-org.1560.n6.nabble.com/file/n5034507/my_data_SLD.gif> 

<http://osgeo-org.1560.n6.nabble.com/file/n5034507/my_data.gif> 

So what's wrong in here? The SLD file is exactly the same found in the SLD
cookbock, I doubt it has an error. Do I have to configure the layer somehow
in the map file in order for Mapserver to style it with the SLD?

Thank you.

[1]
http://docs.geoserver.org/latest/en/user/styling/sld-cookbook/rasters.html#example-raster



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