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

[Andreas Neumann]

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
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-- 

--
Andreas Neumann
QGIS.ORG board member (treasurer)
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