[prev in list] [next in list] [prev in thread] [next in thread] 

List:       qgis-user
Subject:    Re: AW: [Qgis-user] WFS Support in QGIS ?!
From:       Peter Willis <peterw () borstad ! com>
Date:       2009-04-28 18:10:10
Message-ID: 49F74682.2070504 () borstad ! com
[Download RAW message or body]

Hello Marco,

I just tried the WFS plug-in. It Worked!!! :)
It even loaded all the attributes.

I stand corrected regarding WFS and QGIS.

Maybe the plug-in should be moved into the
'Layer' menu.

One additional note: I have WFS attributes coming
from Mapserver version 5 that are represented in
mapserver namespace
(ie: <ms:[attribute name]>[attribute value]</ms:[attribute name]>)
.
Although I am happy that QGIS finds the attributes in that namespace 
context, I am wondering if QGIS will also find attributes when expressed
in wfs namespace as properties.

ie:

<wfs:Property>
<wfs:Type>Numeric</wfs:Type>
<wfs:Name>SomeData</wfs:Name>
<wfs:Value>4070000</wfs:Value>
</wfs:Property>

Or do I have the wrong WFS XML specification....?
Does it matter?


Best Regards,


Peter


Hugentobler Marco wrote:
> Hi Peter
> 
> There is WFS support in QGIS with the WFS plugin (plugins -> manage plugins -> WFS \
> plugin). However, be warned that it has not the same level of maturity as the WMS \
> support. Also, the WFS provider loads everything into virtual memory which might be \
> too much for really big datasets. 
> Regards,
> Marco
> 
> 
> -----Ursprüngliche Nachricht-----
> Von: qgis-user-bounces@lists.osgeo.org im Auftrag von Peter Willis
> Gesendet: Di 28.04.2009 19:03
> An: qgis-user@lists.osgeo.org
> Betreff: [Qgis-user] WFS Support in QGIS ?!
> 
> Hello,
> 
> I see support for WMS layer import which works reasonably well.
> I am not seeing WFS feature support, including the attribute
> data that belongs to the requested feature.
> 
> WFS support in a GIS is, in some ways, more important than WMS
> support. This is due to the fact that the GIS can already 'map'
> things. The point of a GIS is to be able to analyze geographic data
> based on the assigned attributes given to geographic locales.
> 
> Being able to use WMS to make pretty pictures is all well and good.
> The *real* work of GIS has always been in the data analysis.
> 
> The OGC standards for geographic data interchange
> (ie: WFS, WMS, SOS, WCS, GML, TML,...etc.)
> should be the main focus of any aspiring GIS product/application.
> 
> QGIS programmers can be proud of the fact that they are one of
> only 4 applications that reasonably support WMS. There are a
> few non-free applications out there that are supporting WMS
> very poorly.
> 
> There are currently *NO applications* that are properly supporting
> WFS. Although I haven't looked at ESRI products lately. It would be
> quite a coupe for QGIS to move ahead of the pack by supporting
> import/export of the majority of the OGC specifications.
> 
> 
> NOTES:
> 
> While testing, using a multi-polygon vector with 31478 polygons,
> each with 3 attributes,I have noticed that **BOTH** Mozilla Thunderbird
> and M.S Internet Explorer run out of memory while downloading large WFS
> vector requests in XML format.
> 
> I downloaded the same vector using 'wget'. The resulting XML file size
> was a bit larger than 82MB.
> 
> When developing robust applications for WFS (or any other XML format)
> it may be wise to anticipate massive files.
> 
> Best Regards,
> 
> Peter
> _______________________________________________
> Qgis-user mailing list
> Qgis-user@lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-user
> 
> 
> 
> 

_______________________________________________
Qgis-user mailing list
Qgis-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/qgis-user


[prev in list] [next in list] [prev in thread] [next in thread]