[Qgis-user] Temporal Controller on client side of QWC2

[Andreas Neumann]

Hi again,

It seems like LizMap has some support for temporal controller:

https://docs.lizmap.com/next/en/publish/lizmap_plugin/time_manager.html

But as I said - this works through sending vector data and client side 
rendering - so not the full capabilities of the QGIS styling engine.

Greetings,

Andreas

On 2024-06-06 06:41, Andreas Neumann via QGIS-User wrote:

> Hi BJ,
> 
> No - I don't think this is possible. But I am not fully up-to-date 
> about QWC2, as I am not an active user. You might want to ask at the 
> separate QWC2 user mailing list: 
> https://lists.osgeo.org/mailman/listinfo/qgis-qwc2
> 
> Personally, I have doubts about the feasibility of integrating the 
> temporal controller with QGIS server and any web client that relies on 
> raster images. QGIS server is sending raster images of map extents. 
> That approach wouldn't scale very well, due to the additional lag 
> between client and server. To get an acceptable performance, it would 
> mean that one would have to exchange vector features (geometry and 
> attributes) and render client-side - and then you loose the QGIS 
> symbology features ...
> 
> It might be more feasible to use QGIS wasm (web assembly) for this 
> purpose. But it is still a young project. In QGIS wasm, the QGIS 
> rendering engine runs inside the browser. It is also generating raster 
> images, but it would hold the original GIS data in the client and also 
> render in the client, eliminating the network lag between server and 
> client. There you would maintain the QGIS rendering and labeling 
> capabilities.
> 
> If you have a serious interest in that feature, one could further 
> discuss if an implementation of the temporal controller with QGIS wasm 
> would be an option. But it would require an investment in the qgis-js 
> API/bindings and a client side implementation of the temporal 
> controller with some web framework.
> 
> Best regards,
> Andreas
> 
> On Wed, 5 Jun 2024 at 23:58, BJ Raval via QGIS-User 
> <qgis-user at lists.osgeo.org> wrote:
> 
>> Hi Andreas,
>> I am an occasional desktop QGIS user but this is my first time asking 
>> a question for help.
>> I would like to use the Temporal Controller on a web page served by 
>> QWC2 web client. Is it possible to use Temporal Controller by a user 
>> on the client side on the web browser?
>> 
>> A detailed answer of "how-to" would be much appreciated if this is 
>> possible.
>> Sincere thanks!
>> BJ _______________________________________________
>> QGIS-User mailing list
>> QGIS-User at lists.osgeo.org
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> 
> --
> 
> --
> Andreas Neumann QGIS.ORG [1] board member (treasurer)
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