[Qgis-user] Questions regarding WMS layers

[Andrea Giudiceandrea]

> *Richard Duivenvoorde*rdmailings at duif.net 
> <mailto:qgis-user%40lists.osgeo.org?Subject=Re%3A%20%5BQgis-user%5D%20Questions%20regarding%20WMS%20layers&In-Reply-To=%3C93e8be79-e5e8-34d6-cfb2-c837dcb0fbaf%40duif.net%3E>
> /Wed Apr 13 08:47:48 PDT 2022/
> ------------------------------------------------------------------------
> >/2. When adding a new WMS layer. Could anybody explain what does the 
> Step Size mean? when to use it? What is "contextual WMS legend" when 
> to use it? /
> For these I'm not clear, but I think these are related to tiled-WMS (in which you are not trying to get one image, but you request them in parts like 256x256 pixels).
> I'm not sure what 'stepsize' is... others?

Hi Richard, Robert and list,
the "Request step size" option has been introduced by Jürgen E. Fischer 
[1] [2] [3].

The missing description of this option in the user guide / manual was 
raised by me some time ago in the QGIS Documentation repository on 
GitHub [4] but no one was able to find an explanation of it [5].

> A contextual legend is (I think) a legend which changes based on the zoom level or area you are in.

It's possible to find more information about the contextual WMS legend:
- in the user guide: "you can activate checkbox Use contextual WMS 
Legend if the WMS Server supports this feature. Then only the relevant 
legend for your current map view extent will be shown and thus will not 
include legend items for items you can’t see in the current map." [6]
- in an answer to a question to gis.stackexchange [7]
- in the feature request / enhancement proposals / pull request [8]

Best regards.

Andrea Giudiceandrea

[1] 
https://github.com/qgis/QGIS/commit/baa5d90ddc58e469b5bdbb602793f00ec74bcb91
[2] 
https://github.com/qgis/QGIS/commit/f924578b63a0a7a33edab8dd6d2beb454dfb3d10
[3] 
https://github.com/qgis/QGIS/commit/72342557c3ebfaee17921659726a2a8e18d347fb
[4] 
https://github.com/qgis/QGIS-Documentation/issues/1703#issuecomment-675533691
[5] https://github.com/qgis/QGIS-Documentation/pull/6338
[6] 
https://docs.qgis.org/3.22/en/docs/user_manual/working_with_ogc/ogc_client_support.html#loading-wms-wmts-layers
[7] 
https://gis.stackexchange.com/questions/273196/how-to-get-legend-image-from-a-wms-using-pyqgis/273358#273358
[8] https://issues.qgis.org/issues/11859 - 
https://github.com/qgis/QGIS-Enhancement-Proposals/pull/15/files - 
https://github.com/qgis/QGIS/pull/1735
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