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

[Kurt Menke]

Yes that is closer but the real goal is to be able to add an SLD to the
project file. Ideally as a SLD_BODY parameter for the URL.
Kurt

On Tue, Oct 26, 2021 at 6:30 PM Charles Dixon-Paver <charles at kartoza.com>
wrote:

> 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
>> 4710-057 Braga
>> Gabinete 3.29 (Piso 3)
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