Re: [MapServer-users] How to use SLD generated from CLASS and how to use STYLEITEM with sld

[Rahkonen Jukka via MapServer-users]

Hi,

I cannot say what makes trouble for you, but like this it should work:

https://demo.mapserver.org/cgi-bin/wms?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetStyles&layers=continents

-Jukka Rahkonen-

________________________________________
Lähettäjä: MapServer-users käyttäjän Trygve Aspenes via MapServer-users puolesta
Lähetetty: Torstai 8. toukokuuta 2025 14.21
Vastaanottaja: mapserver-users@lists.osgeo.org
Aihe: [MapServer-users] How to use SLD generated from CLASS and how to use 
STYLEITEM with sld


I'm looking at SLD with mapserver 8.4.0

I think I read somewhere in the docs that mapserver can generate SLD
from a layer defined class. Not sure if this is correct. I try with my
test with GetStyles like this:

curl
'http://localhost:8091/okd?version=1.3.0&service=wms&request=getstyles&layers=TestLayer'

But this gives me:

<StyledLayerDescriptor version="1.1.0"
xsi:schemaLocation="http://www.opengis.net/sld
http://schemas.opengis.net/sld/1.1.0/StyledLayerDescriptor.xsd";
xmlns="http://www.opengis.net/sld";
xmlns:ogc="http://www.opengis.net/ogc";
xmlns:se="http://www.opengis.net/se";
xmlns:xlink="http://www.w3.org/1999/xlink";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
</StyledLayerDescriptor>

So it is a valid SLD, but with no actual content

The layer part in my mapfile looks like this:
     LAYER
         NAME "TestLayer"
         TYPE RASTER
         STATUS ON
         METADATA
             "ows_sld_enabled" "true"
             "SLD_USE_FIRST_NAMEDLAYER" "true"
         END
         DATA "<raster data>"
         PROJECTION
            <some projection>
         END
         METADATA
             "wms_title" "Test Layer"
             "wms_srs" "EPSG:3857 EPSG:4326"
         END
         CLASS
             NAME " 0 -  3"
             GROUP "value"
             EXPRESSION ([pixel]>=0.0 and [pixel]<3.0)
             STYLE
                 COLOR 221 95 77
             END # STYLE
         END # CLASS
         <Some more classes>
      END


Then I try to remove the CLASS definitions and add STYLEITEM with and
sld document like this:

     LAYER
         NAME "TestLayer"
         TYPE RASTER
         STATUS ON
         STYLEITEM "sld://sld-test.xml" #Using the example of the latest
docs p 873-874>
         METADATA
             "ows_sld_enabled" "true"
             "SLD_USE_FIRST_NAMEDLAYER" "true"
         END
         DATA "<raster data>"
         PROJECTION
            <some projection>
         END
         METADATA
             "wms_title" "Test Layer"
             "wms_srs" "EPSG:3857 EPSG:4326"
         END
      END

But still the same response with the GetStyles request as above.

What am I missing here? Any ideas?

mapserv -v says: MapServer version 8.4.0 PROJ version 9.4 GDAL version
3.8 OUTPUT=PNG OUTPUT=JPEG SUPPORTS=PROJ SUPPORTS=AGG SUPPORTS=FREETYPE
SUPPORTS=CAIRO SUPPORTS=ICONV SUPPORTS=FRIBIDI SUPPORTS=WMS_SERVER
SUPPORTS=WFS_SERVER SUPPORTS=WCS_SERVER SUPPORTS=OGCAPI_SERVER
SUPPORTS=FASTCGI SUPPORTS=GEOS SUPPORTS=PBF INPUT=JPEG INPUT=POSTGIS
INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE INPUT=FLATGEOBUF

Trygve
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