Re: [Qgis-user] Questions regarding WMS layers

2022-04-14 Thread Harrissou s. via Qgis-user 
Hi,
FYI, a reply from Jürgen yesterday to complete the explanation: 
https://github.com/qgis/QGIS-Documentation/pull/6338#issuecomment-1098428884 
(you can track the source and the issue report).
I must admit that I didn't get the difference between the two options 
(considering the displayed description of the first option in the docs), 
reason why no PR was opened, yet. So yes, +1 for an explanation of the two 
options.

Regards,
Harrissou

Le jeu. 14 avr. 2022 à 16:38, Burghardt Scholle via Qgis-user <
qgis-user@lists.osgeo.org> a écrit :

> Hi Andrea,
>
>  
>
> apologies, but the explanation of the differences between "Tile size" and 
> "Request step size" options is beyond my knowledge. 
>
> At that time I had talked with Jürgen Fischer about the problem with 
> tiling during printing.
>
> Thereupon Jürgen had programmed the "request stept size" option.
>
>  
>
> Perhaps Jürgen can contribute something to the clarification.
>
>  
>
> Regards
>
> Burghardt
>
>  
>
> *Von:* Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] *Im Auftrag 
> von *Andrea Giudiceandrea via Qgis-user
> *Gesendet:* Donnerstag, 14. April 2022 13:27
> *An:* qgis-user@lists.osgeo.org
> *Betreff:* Re: [Qgis-user] Questions regarding WMS layers
>
>  
>
> *Burghardt.Scholle at stadt.wolfsburg.de <http://stadt.wolfsburg.de>* 
> Burghardt.Scholle 
> at stadt.wolfsburg.de 
> 
> *Wed Apr 13 21:39:58 PDT 2022* 
> --
>
> Particularly when printing larger formats, elements are often cut off by 
> tiling, e.g. in the case of texts.
>
> By defining a (higher) initial size, tiling can be prevented for this format.
>
>
> Hi Burghardt,
> thanks for sharing this information.
>
> Could you please explain the difference between the "Tile size" options 
> and the "Request step size" options and give a link to an online 
> documentation which explains in details the "Request step size" 
> functionality?
>
> Best regards.
>
> Andrea
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Re: [Qgis-user] Questions regarding WMS layers

2022-04-14 Thread Burghardt Scholle via Qgis-user 
Hi Andrea,

apologies, but the explanation of the differences between "Tile size" and 
"Request step size" options is beyond my knowledge.
At that time I had talked with Jürgen Fischer about the problem with tiling 
during printing.
Thereupon Jürgen had programmed the "request stept size" option.

Perhaps Jürgen can contribute something to the clarification.

Regards
Burghardt

Von: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] Im Auftrag von Andrea 
Giudiceandrea via Qgis-user
Gesendet: Donnerstag, 14. April 2022 13:27
An: qgis-user@lists.osgeo.org
Betreff: Re: [Qgis-user] Questions regarding WMS layers

Burghardt.Scholle at stadt.wolfsburg.de Burghardt.Scholle at 
stadt.wolfsburg.de<mailto:qgis-user%40lists.osgeo.org?Subject=Re%3A%20%5BQgis-user%5D%20Questions%20regarding%20WMS%20layers=%3Cdd8cf6f63c8444c1ad90843d6d136e9e%40stadt.wolfsburg.de%3E>
Wed Apr 13 21:39:58 PDT 2022


Particularly when printing larger formats, elements are often cut off by 
tiling, e.g. in the case of texts.

By defining a (higher) initial size, tiling can be prevented for this format.

Hi Burghardt,
thanks for sharing this information.

Could you please explain the difference between the "Tile size" options and the 
"Request step size" options and give a link to an online documentation which 
explains in details the "Request step size" functionality?

Best regards.

Andrea
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Re: [Qgis-user] Questions regarding WMS layers

2022-04-14 Thread Andrea Giudiceandrea via Qgis-user 
*Burghardt.Scholle at stadt.wolfsburg.de*Burghardt.Scholle at 
stadt.wolfsburg.de 


/Wed Apr 13 21:39:58 PDT 2022/

Particularly when printing larger formats, elements are often cut off by 
tiling, e.g. in the case of texts.
By defining a (higher) initial size, tiling can be prevented for this format.


Hi Burghardt,
thanks for sharing this information.

Could you please explain the difference between the "Tile size" options 
and the "Request step size" options and give a link to an online 
documentation which explains in details the "Request step size" 
functionality?


Best regards.

Andrea___
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Re: [Qgis-user] Questions regarding WMS layers

2022-04-14 Thread nagyrobi_r--- via Qgis-user 
Very helpful Burghardt! Thank you a lot! 

Sent from Yahoo Mail on Android 
 
  On Thu, Apr 14, 2022 at 6:40 AM, 
burghardt.scho...@stadt.wolfsburg.de 
wrote:   Hi Robert,

the "request step size" can be used to affect the tiling when printing a map. 
Particularly when printing larger formats, elements are often cut off by 
tiling, e.g. in the case of texts.
By defining a (higher) initial size, tiling can be prevented for this format.

Regards
Burghardt


***

Stadt Wolfsburg
Referat 21-2 Geoinformation und Gedatenanalyse
Rathaus E, Zi. E 313, Porschestraße 47A, D-38440 Wolfsburg
Tel +49 5361 28-2531
Fax +49 5361 28-1765
mailto:burghardt.scho...@stadt.wolfsburg.de


  
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Re: [Qgis-user] Questions regarding WMS layers

2022-04-13 Thread Burghardt Scholle via Qgis-user 
Hi Robert,

the "request step size" can be used to affect the tiling when printing a map. 
Particularly when printing larger formats, elements are often cut off by 
tiling, e.g. in the case of texts.
By defining a (higher) initial size, tiling can be prevented for this format.

Regards
Burghardt


***

Stadt Wolfsburg
Referat 21-2 Geoinformation und Gedatenanalyse
Rathaus E, Zi. E 313, Porschestraße 47A, D-38440 Wolfsburg
Tel +49 5361 28-2531
Fax +49 5361 28-1765
mailto:burghardt.scho...@stadt.wolfsburg.de


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Re: [Qgis-user] Questions regarding WMS layers

2022-04-13 Thread Andrea Giudiceandrea via Qgis-user 
*Richard Duivenvoorde*rdmailings at duif.net 


/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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Re: [Qgis-user] Questions regarding WMS layers

2022-04-13 Thread Richard Duivenvoorde via Qgis-user 

On 4/13/22 17:07, nagyrobi_r--- via Qgis-user wrote:

I'd say: start using it, and do not use the parts you have questions about :-)
Those are mostly used for 'special' cases (I'll try to explain below).


1. I have seen these settings in ADD new WMS connection. Could anybody explain 
to me what are the settings marked with yellow? What do they do? When to use 
them? HTTP headers?  Advanced? Ignore GetMap URI reported in the get 
capabilities? Ignore Getfeatureinfo URI reported in the get capabilities?


HTTP Headers: some services need a special 'referer'-Header, else they will not 
work (these are there to make it more difficult for others to use the 
service). But by setting this (http) Header we can sometimes fool the 
service a little.

The Advanced section is actually the same: some (not so standard) services want 
special HTTP-headers to work. Http Headers are always key-value pairs, so in 
this way you can add some custom header key/value pairs, which QGIS then will 
sent with every request. Normally these are not needed.

Ignore Get*
The 'GetCapabilities'-request is the request you sent before requesting a map, 
just to know what the available (in the service) layers/styles/crs's etc etc 
are).
In early days, a lot of WMS services were not very well configured.
So in the xml then the 'url's' for all kind of services were set to 
'http://localhost/', which makes it for QGIS impossible to retrieve the 
/tile/map/legendgraphic/featureinfo. But we knew most of the time, that we 
actually needed to use the same hostname/url as used for the 
GetCapabilities-url... So in this way you could handle bad configured WMS's.

As said: nowadays you can (unless you have issues) just ignore these 'work 
arounds'...


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?

A contextual legend is (I think) a legend which changes based on the zoom level 
or area you are in.
I think it makes QGIS request fresh legend (images) for every change of 
zoom/pan... but others please correct me if wrong.

Again: leave all those blank and try if that works for you :-)

Regards,

Richard Duivenvoorde
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[Qgis-user] Questions regarding WMS layers

2022-04-13 Thread nagyrobi_r--- via Qgis-user 
Hei Everybody. I have skimming the documentation, but couldn't find anything 
regarding these settings. I have 2 questions regarding adding WMS layers.
1. I have seen these settings in ADD new WMS connection. Could anybody explain 
to me what are the settings marked with yellow? What do they do? When to use 
them? HTTP headers?  Advanced? Ignore GetMap URI reported in the get 
capabilities? Ignore Getfeatureinfo URI reported in the get capabilities? 

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?

Thank you a lot,Kind regards,Robert Nagy___
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