[QGIS-Developer] applying an SLD to a WMS layer

[Charles Dixon-Paver]

Just to chime in, all these responses seem to be discussing sld and wms
server configuration options, but the original question mentioned applying
edits to the qgis project file. I would think the simplest solution is to
use something like loadSldStyle[1] from pyqgis? Not sure if I'm missing the
point of the conversation though.

[1]
https://qgis.org/pyqgis/master/core/QgsMapLayer.html#qgis.core.QgsMapLayer.loadSldStyle

On Tue, 26 Oct 2021 at 14:21, Jorge Gustavo Rocha <jgr at di.uminho.pt> wrote:

> Hi René,
>
> I'm just asking questions to fully understand the use case. Thank you
> for your feedback. You mentioned an interesting point.
>
> As you mentioned, the solution can be based on the server side if the
> map server accepts an SLD.
>
> This approach can not be used against WMS services working behind
> caches/tiling services providing only predefined styles.
>
> Regards,
>
> Jorge Gustavo
>
> On 26/10/21 12:43, René-Luc Dhont wrote:
> > Hi Jorge,
> >
> > WMS Server can process SLD  provide in a GetMap Request.
> > QGIS Server is able to apply an SLD to a layer and provide the resulting
> > image. The SLD can be provided through the SLD_BODY parameter or the
> > SLD parameter for linked file.
> >
> https://docs.qgis.org/3.16/en/docs/server_manual/services.html#qgisserver-wms-getmap
> > This capability is mainly exploited by web clients
> >
> > René-Luc
> >
> > Le 26/10/2021 à 12:26, Jorge Gustavo Rocha a écrit :
> >> Hi Kurt,
> >>
> >> By design, WMS GetMap requests returns images. Those are rendered on
> >> the server side, by the map server. Many services just provide those
> >> rendered images.
> >>
> >> Are you trying to provide advanced image processing capabilities on
> >> the client side to apply an SLD on top those images?
> >>
> >> Or would you like to try other GetMap formats, more friendly to
> >> process on the client side? Like svg or kml? Some of these formats are
> >> available as vendor options of the map server.
> >>
> >> Regards,
> >>
> >> Jorge Gustavo
> >>
> >>
> >> On 26/10/21 10:58, Kurt Menke wrote:
> >>> Hello,
> >>> We have been developing web apps that allow the user to download the
> >>> selected extent and data layers as a QGIS project file. Many of the
> >>> layers are hosted by the government as WMS services. We are wondering
> >>> if anyone has looked into the possibility of applying an SLD style to
> >>> a WMS layer in QGIS. We were hoping to be able to edit the *.qgs file
> >>> programmatically. We would be interested in sponsoring the effort
> >>> depending on the level of effort required, assuming it is even
> possible.
> >>> Best,
> >>> Kurt
> >>>
> >>> --
> >>>
> >>> Kurt Menke
> >>>
> >>> GIS-Consultant
> >>> --------------------------
> >>> Septima P/S
> >>> Frederiksberggade 19, 2nd Floor
> >>> 1459 Copenhagen
> >>>
> >>> Tlf: +45 5114 6444
> >>>
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> >>
> >> J. Gustavo
> >
> >
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>
> J. Gustavo
> --
> Jorge Gustavo Rocha
> Departamento de Informática
> Universidade do Minho
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> Gabinete 3.29 (Piso 3)
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