[Qgis-user] WMS problem - QGIS 1.0 prev 2

[Tomasz Suchan]

Hi Marco,
Thanks it seems that it's a bug in geoportal. I'll send them a note,
hopefully they'll fix it.
Tom


Hugentobler  Marco wrote:
> 
> Hi Thomas
> 
> The WMS specification for WMS 1.3 specifies that for epsg geographical 
> coordinate systems, the order of the bounding box parameters is latMin, 
> longMin, latMax, longMax. For other crs, it is xmin, ymin, xmax, ymax.
> In contrast, WMS 1.1.1 used longMin, latMin, longMax, latMax also for 
> geographic CRS.
> 
> Therefore, QGIS switches latitudes and longitudes for epsg 4326 (and other 
> geographical CRS) if the server states that it supports WMS 1.3.
> 
> I think the geoportal server does not consider the mentioned change
> between 
> WMS 1.1.1 and WMS 1.3.
> 
> Marco
> 
> 
> 
> 
> From the 1.3. implementation specification 
> (http://portal.opengeospatial.org/files/?artifact_id=14416), page 15 and 
> following:
> 
> Coordinates shall be listed in the order defined by the CRS and shall be
> mapped 
> appropriately to the Map CS i
> and j axes, swapping axis order as needed during the projection operation. 
> Many projected coordinate reference
> systems have an axis and coordinate order other than easting, northing.
> For 
> example, the Uniform Coordinate
> System used in Finland (EPSG:2393) orders northing before easting. EPSG 
> geographic coordinate reference
> systems follow ISO 6709 and always list latitude before longitude.
> 
> 
> and later they give an example for BBOX:
> 
> EXAMPLE 2
> A <BoundingBox> representing the entire Earth in the EPSG:4326 Layer CRS
> would 
> be written as
> <BoundingBox CRS="EPSG:4326" minx="-90" miny="-180" maxx="90" maxy="180">.
> A BBOX parameter requesting a map of the entire Earth would be written in
> this 
> CRS as
> BBOX=-90,-180,90,180.
> 
> 
> 
> 
> 
> 
> 
> On Tuesday 25 November 2008 19:52:14 Tomasz Suchan wrote:
>> Hi All,
>> I have a problem with WMS requests... I'm trying to add WMS layer to my
>> project. All goes well with http://wms.jpl.nasa.gov/wms.cgi server, but I
>> have problems when I try to add
>> http://maps.geoportal.gov.pl/WMS_ORTO/WMService.aspx - I can see only
>> white
>> background of the layer with server's watermark on it...
>> I have figured out what's wrong but unfortunately I have no clue how to
>> fix
>> that. The request from QGIS is as follows:
>>
>> http://maps.geoportal.gov.pl/WMS_ORTO/WMService.aspx?SERVICE=WMS&VERSION=1.
>>3.0&REQUEST=GetMap&BBOX=50.304627,16.799312,50.304822,16.799668&CRS=EPSG:432
>>6&WIDTH=1052&HEIGHT=576&LAYERS=ORTOFOTO&STYLES=&FORMAT=image/jpeg
>>
>> But, server ends me the proper map when I switch latitudes and longitudes
>> as below:
>> http://maps.geoportal.gov.pl/WMS_ORTO/WMService.aspx?SERVICE=WMS&VERSION=1.
>>3.0&REQUEST=GetMap&BBOX=16.799312,50.304627,16.799668,50.304822&CRS=EPSG:432
>>6&WIDTH=1052&HEIGHT=576&LAYERS=ORTOFOTO&STYLES=&FORMAT=image/jpeg
>>
>> Thanks for any help, Tom
> 
> -- 
> Dr. Marco Hugentobler
> Institute of Cartography
> ETH Zurich
> Technical Advisor QGIS Project Steering Committee
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-user
> 
> 

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