[QGIS-Developer] QGIS-Server: filter by categories in an OGC compatible way

Tue Apr 9 07:18:48 PDT 2019

Hi,
if you want to pass a verbatim SLD, you should use SLD_BODY. This seems to
work:

https://services.geo.zg.ch/ows-oereb/Grundwasserschutz?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&BBOX=2682932,1225299,2684213,1226054&CRS=EPSG:2056&WIDTH=1615&HEIGHT=952&LAYERS=ch.zg.grundwasserschutz.gwszonen&STYLES=&FORMAT=image/png&DPI=96&MAP_RESOLUTION=96&FORMAT_OPTIONS=dpi:96&TRANSPARENT=TRUE&SLD_BODY=%3CStyledLayerDescriptor+xmlns%3D%22http%3A%2F%2Fwww.opengis.net%2Fsld%22+xmlns%3Axlink%3D%22http%3A%2F%2Fwww.w3.org%2F1999%2Fxlink%22+xmlns%3Axsi%3D%22http%3A%2F%2Fwww.w3.org%2F2001%2FXMLSchema-instance%22+xsi%3AschemaLocation%3D%22http%3A%2F%2Fwww.opengis.net%2Fsld+http%3A%2F%2Fschemas.opengis.net%2Fsld%2F1.1.0%2FStyledLayerDescriptor.xsd%22+xmlns%3Ase%3D%22http%3A%2F%2Fwww.opengis.net%2Fse%22+version%3D%221.1.0%22+xmlns%3Aogc%3D%22http%3A%2F%2Fwww.opengis.net%2Fogc%22%3E%0D%0A+%3CNamedLayer%3E%0D%0A++%3Cse%3AName%3Ech.zg.grundwasserschutz.gwszonen%3C%2Fse%3AName%3E%0D%0A++%3CUserStyle%3E%0D%0A+++%3Cse%3AName%3Edefault%3C%2Fse%3AName%3E%0D%0A+++%3Cse%3AFeatureTypeStyle%3E%0D%0A++++%3Cse%3ARule%3E%0D%0A+++++%3Cse%3AName%3EGrundwasserschutzzone+S1%3C%2Fse%3AName%3E%0D%0A+++++%3Cse%3ADescription%3E%0D%0A++++++%3Cse%3ATitle%3EGrundwasserschutzzone+S1%3C%2Fse%3ATitle%3E%0D%0A+++++%3C%2Fse%3ADescription%3E%0D%0A+++++%3Cogc%3AFilter+xmlns%3Aogc%3D%22http%3A%2F%2Fwww.opengis.net%2Fogc%22%3E%0D%0A++++++%3Cogc%3APropertyIsEqualTo%3E%0D%0A+++++++%3Cogc%3APropertyName%3Etyp_code%3C%2Fogc%3APropertyName%3E%0D%0A+++++++%3Cogc%3ALiteral%3ES1%3C%2Fogc%3ALiteral%3E%0D%0A++++++%3C%2Fogc%3APropertyIsEqualTo%3E%0D%0A+++++%3C%2Fogc%3AFilter%3E%0D%0A+++++%3Cse%3APolygonSymbolizer%3E%0D%0A++++++%3Cse%3AFill%3E%0D%0A+++++++%3Cse%3ASvgParameter+name%3D%22fill%22%3E%23003bb3%3C%2Fse%3ASvgParameter%3E%0D%0A++++++%3C%2Fse%3AFill%3E%0D%0A++++++%3Cse%3AStroke%3E%0D%0A+++++++%3Cse%3ASvgParameter+name%3D%22stroke%22%3E%23000080%3C%2Fse%3ASvgParameter%3E%0D%0A+++++++%3Cse%3ASvgParameter+name%3D%22stroke-width%22%3E1%3C%2Fse%3ASvgParameter%3E%0D%0A+++++++%3Cse%3ASvgParameter+name%3D%22stroke-linejoin%22%3Ebevel%3C%2Fse%3ASvgParameter%3E%0D%0A++++++%3C%2Fse%3AStroke%3E%0D%0A+++++%3C%2Fse%3APolygonSymbolizer%3E%0D%0A++++%3C%2Fse%3ARule%3E%0D%0A+++%3C%2Fse%3AFeatureTypeStyle%3E%0D%0A++%3C%2FUserStyle%3E%0D%0A+%3C%2FNamedLayer%3E%0D%0A%3C%2FStyledLayerDescriptor%3E

Using &sld=... you should feed it with a URL that the SLD can be downloaded
from instead
(none of this is QGIS specific, it's just how the SLD specification says
user provided styles should be used).

Cheers
Andrea

On Tue, Apr 9, 2019 at 4:15 PM Andreas Neumann <a.neumann at carto.net> wrote:

> Hi,
>
> I did some test:
>
> Here is a long URL with the SLD (originally sent by QGIS server, stripped
> away some RULES manually) and sending it back in a GetMap request:
>
>
> https://services.geo.zg.ch/ows-oereb/Grundwasserschutz?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&BBOX=2682932,1225299,2684213,1226054&CRS=EPSG:2056&WIDTH=1615&HEIGHT=952&LAYERS=ch.zg.grundwasserschutz.gwszonen&STYLES=&FORMAT=image/png&DPI=96&MAP_RESOLUTION=96&FORMAT_OPTIONS=dpi:96&TRANSPARENT=TRUE&SLD=%3CStyledLayerDescriptor+xmlns%3D%22http%3A%2F%2Fwww.opengis.net%2Fsld%22+xmlns%3Axlink%3D%22http%3A%2F%2Fwww.w3.org%2F1999%2Fxlink%22+xmlns%3Axsi%3D%22http%3A%2F%2Fwww.w3.org%2F2001%2FXMLSchema-instance%22+xsi%3AschemaLocation%3D%22http%3A%2F%2Fwww.opengis.net%2Fsld+http%3A%2F%2Fschemas.opengis.net%2Fsld%2F1.1.0%2FStyledLayerDescriptor.xsd%22+xmlns%3Ase%3D%22http%3A%2F%2Fwww.opengis.net%2Fse%22+version%3D%221.1.0%22+xmlns%3Aogc%3D%22http%3A%2F%2Fwww.opengis.net%2Fogc%22%3E%0D%0A+%3CNamedLayer%3E%0D%0A++%3Cse%3AName%3Ech.zg.grundwasserschutz.gwszonen%3C%2Fse%3AName%3E%0D%0A++%3CUserStyle%3E%0D%0A+++%3Cse%3AName%3Edefault%3C%2Fse%3AName%3E%0D%0A+++%3Cse%3AFeatureTypeStyle%3E%0D%0A++++%3Cse%3ARule%3E%0D%0A+++++%3Cse%3AName%3EGrundwasserschutzzone+S1%3C%2Fse%3AName%3E%0D%0A+++++%3Cse%3ADescription%3E%0D%0A++++++%3Cse%3ATitle%3EGrundwasserschutzzone+S1%3C%2Fse%3ATitle%3E%0D%0A+++++%3C%2Fse%3ADescription%3E%0D%0A+++++%3Cogc%3AFilter+xmlns%3Aogc%3D%22http%3A%2F%2Fwww.opengis.net%2Fogc%22%3E%0D%0A++++++%3Cogc%3APropertyIsEqualTo%3E%0D%0A+++++++%3Cogc%3APropertyName%3Etyp_code%3C%2Fogc%3APropertyName%3E%0D%0A+++++++%3Cogc%3ALiteral%3ES1%3C%2Fogc%3ALiteral%3E%0D%0A++++++%3C%2Fogc%3APropertyIsEqualTo%3E%0D%0A+++++%3C%2Fogc%3AFilter%3E%0D%0A+++++%3Cse%3APolygonSymbolizer%3E%0D%0A++++++%3Cse%3AFill%3E%0D%0A+++++++%3Cse%3ASvgParameter+name%3D%22fill%22%3E%23003bb3%3C%2Fse%3ASvgParameter%3E%0D%0A++++++%3C%2Fse%3AFill%3E%0D%0A++++++%3Cse%3AStroke%3E%0D%0A+++++++%3Cse%3ASvgParameter+name%3D%22stroke%22%3E%23000080%3C%2Fse%3ASvgParameter%3E%0D%0A+++++++%3Cse%3ASvgParameter+name%3D%22stroke-width%22%3E1%3C%2Fse%3ASvgParameter%3E%0D%0A+++++++%3Cse%3ASvgParameter+name%3D%22stroke-linejoin%22%3Ebevel%3C%2Fse%3ASvgParameter%3E%0D%0A++++++%3C%2Fse%3AStroke%3E%0D%0A+++++%3C%2Fse%3APolygonSymbolizer%3E%0D%0A++++%3C%2Fse%3ARule%3E%0D%0A+++%3C%2Fse%3AFeatureTypeStyle%3E%0D%0A++%3C%2FUserStyle%3E%0D%0A+%3C%2FNamedLayer%3E%0D%0A%3C%2FStyledLayerDescriptor%3E
>
> The response is:
> <ServiceExceptionReport xmlns="http://www.opengis.net/ogc" version="1.3.0"
> >
> <ServiceException code="Invalid Parameter">
> SLD ('<StyledLayerDescriptor xmlns="http://www.opengis.net/sld"
> 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/1.1.0/StyledLayerDescriptor.xsd" xmlns:se="
> http://www.opengis.net/se" version="1.1.0" xmlns:ogc="
> http://www.opengis.net/ogc"> <NamedLayer>
> <se:Name>ch.zg.grundwasserschutz.gwszonen</se:Name> <UserStyle>
> <se:Name>default</se:Name> <se:FeatureTypeStyle> <se:Rule>
> <se:Name>Grundwasserschutzzone S1</se:Name> <se:Description>
> <se:Title>Grundwasserschutzzone S1</se:Title> </se:Description> <ogc:Filter
> xmlns:ogc="http://www.opengis.net/ogc"> <ogc:PropertyIsEqualTo>
> <ogc:PropertyName>typ_code</ogc:PropertyName> <ogc:Literal>S1</ogc:Literal>
> </ogc:PropertyIsEqualTo> </ogc:Filter> <se:PolygonSymbolizer> <se:Fill>
> <se:SvgParameter name="fill">#003bb3</se:SvgParameter> </se:Fill>
> <se:Stroke> <se:SvgParameter name="stroke">#000080</se:SvgParameter>
> <se:SvgParameter name="stroke-width">1</se:SvgParameter> <se:SvgParameter
> name="stroke-linejoin">bevel</se:SvgParameter> </se:Stroke>
> </se:PolygonSymbolizer> </se:Rule> </se:FeatureTypeStyle> </UserStyle>
> </NamedLayer> </StyledLayerDescriptor>') cannot be converted into QString
> </ServiceException>
> </ServiceExceptionReport>
>
> So apparently the SLD cannot be converted to a QString. Is my encoding in
> the URL above wrong or am I missing a required additional parameter?
>
> Can you point me to an example how to create a valid GetMap request with
> an SLD submitted?
>
> Thanks a lot,
> Andreas
>
> On 2019-04-09 15:38, Andreas Neumann wrote:
>
> Hi,
>
> Does QGIS-Server support SLD styles to filter away RULEs in a GetMap
> Request?
>
> I would assume, yes, but in what encoding would I submit such an SLD in a
> GET request? I know that one should rather use POST reqests for such long
> parameters, but for experimenting, it would be ok to use GET.
>
> The idea would be to allow users to enable/disable categories within a
> given layer.
>
> The WMS client would first request the available rules with a GetStyles
> command (that part works fine) and would then filter the RULE (strip away
> the unwanted RULEs) and resubmit the GetMap with an SLD. Does that work
> with QGIS server?
>
> I know that one can also use the FILTER parameter, but we want to do it in
> an OGC compatible way, since the client being developed should work with
> any OGC compatible WMS server.
>
> Thanks for your reply,
>
> Andreas
>
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