Hi Jukka,
Thanks for your feedback, Jukka. Your explanations are usefull.
Bye
Olivier
On 21/11/2010 19:11, Vincent Heurteaux wrote:
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
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