[mapserver-users] Re: EPSG:4326 with WMS 1.3.0

[Vincent Heurteaux]

Hello Jukka,
Thank's for your feedback. After a closer look to WMS 1.3.0 specification (OGC 06-042, section 6.7.2 page 15), it appears that you are totally right.

Thank's again,

Vincent

Le 21 nov. 2010 à 16:38, Rahkonen Jukka a écrit :

> vheurteaux wrote:
> 
>> Hello Jukka,
> 
>> You said "You may see rotated maps if you open gml vector data returned by
> WFS 1.1.0 service with a client than can't handle axis flipping but that is
> a client error".
> 
>> Do we agree that the server is expected to return a rotated map, and that
> the client is expected to put it back in the right orientation?
> 
> Not really, I fear. Even WFS server does not send rotated maps, it is sending normally oriented vector maps with coordinates in order northing-easting with some projections. The vector map client is expected to parse the coordinates correctly by following the projection definitions.  For example UTM zones are always easting-northing and WFS output from versions 1.0.0 and 1.1.0 have the same axis order.
> 
>> Do we agree that on a client with no such capability (for example when
> viewing the image directly in the internet browser), the image in EPSG:4326
> shall appear rotated?
> 
> WMS is sending images as they should appear on the screen and client is not supposed to do any pixel-by-pixel warping. Only thing that a proper WMS 1.3.0 client need to do is to build BBOX with correct axis order, either easting-northing or northing-easting.  A not-proper WMS 1.3.0 client will build BBOX with wrong axis order (again, with some projections) and get back a north-up image from some other place of the world, not a rotated image.
> 
> -Jukka Rahkonen-
> 
> 
> 
> Cheers
> Vincent
> -- 
> View this message in context: http://osgeo-org.1803224.n2.nabble.com/EPSG-4326-with-WMS-1-3-0-tp5756000p5757819.html
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