AW: [mapserver-users] Re: Reaspect?

[Eichner, Andreas - SID-NLKM]

The WMS standard was written this way to support display devices with
non-square pixels. So it seems to me that you don't want to use a WMS
service. You should really consider using MapServer with "mode=map".
This mode is more appropriate for custom web applications while the WMS
standard is used to increase interoperability.

> That's pretty much what we've decided to do, although the 
> resulting image is
> no longer square. We could, of course, do that, too. But this 
> seems like
> work that really belongs on the server, not on the client 
> side, where all I
> want to do is request an image and have it passed back to me, 
> trimmed the
> way I asked.
> 
> 
> Rahkonen Jukka wrote:
> > 
> > Hi,
> > 
> > That's how the WMS standard is written.  Request must 
> contain BBOX, WIDTH
> > and HEIGHT and server must respect them all. 
> > Reaspect parameter does do something useful against some 
> ArcIMS servers
> > which are configured in a certain way. 
> > Could you describe mose closely when would you need so muct 
> new code? 
> > Isn't taking the BBOX and calculating  MaxX-MinX and 
> MaxY-MinY, and then
> > taking either WIDTH or HEIGHT as given and calculating the 
> missing one
> > good enough for your use case?
> > 
> > -Jukka Rahkonen-
> > 
> > SixDegrees wrote:
> > 
> >> That makes me sad, because I really need an ability 
> similar to what I've
> > described. I can probably pull it off on my own, but that 
> will require a
> > fair amount of new code to accommodate pixels  that are 
> widely different
> > in
> > width and height in many of our images.
> > 
> >> A capability similar to HTML's IMG tag, where the WIDTH 
> and HEIGHT are
> > strictly obeyed when both are present, but the original 
> image's aspect
> > ratio
> > is maintained when one or the other is left off, would be ideal.
> > 
> > I really hope this is not correct, and that the reaspect 
> parameter will do
> > something useful. I can experiment tomorrow when I'm back 
> at the server.
> > 
> > 
> > Rahkonen Jukka wrote:
> >>
> >> Hi,
> >>
> >> Reaspect does not seem to do anything with Mapserver acting as WMS
> >> server.
> >> The example here http://mapserver.org/trunk/faq.html is 
> for Mapserver
> >> acting as a WMS client and reading data from some ArcIMS servers.
> >>
> >> -Jukka Rahkonen-
> >>
> >> SixDegrees wrote:
> >>
> >>> Can someone provide an example of what the 'reaspect' 
> parameter of a wms
> >> request will do when Mapserver receives it in a GetMap 
> request? As I
> >> understand it (poorly) the WIDTH and HEIGHT will remain 
> the same, but if
> >> 'reaspect=true' the BBOX may be adjusted so the aspect ratio of the
> >> projected image is preserved and WIDTH and HEIGHT just 
> specify a "window"
> >> onto this "correctly" proportioned rendering, while if 
> 'reaspect=false'
> >> the
> >> BBOX is retained along with WIDTH and HEIGHT and the image is
> >> stretched/squished to fit. Is this correct, or am I completely
> >> misunderstanding this?
> >>
> >>> Also, if the above is true and 'reaspect=true' is set, how is the
> >>> "window"
> >> defined by WIDTH and HEIGHT placed onto the image? Is it 
> centered with
> >> respect to the BBOX? Placed against one of the corners? Or 
> something else
> >> altogether?
> >>
> >> --
> >> View this message in context:
> >> 
> http://osgeo-org.1803224.n2.nabble.com/Reaspect-tp6953208p6953208.html
> >> Sent from the Mapserver - User mailing list archive at Nabble.com.
> >> _______________________________________________
> >> mapserver-users mailing list
> >> mapserver-users at .osgeo
> >> http://lists.osgeo.org/mailman/listinfo/mapserver-users
> >> _______________________________________________
> >> mapserver-users mailing list
> >> mapserver-users at .osgeo
> >> http://lists.osgeo.org/mailman/listinfo/mapserver-users
> >>
> > 
> > 
> > --
> > View this message in context:
> > 
> http://osgeo-org.1803224.n2.nabble.com/Reaspect-tp6953208p6953294.html
> > Sent from the Mapserver - User mailing list archive at Nabble.com.
> > _______________________________________________
> > mapserver-users mailing list
> > mapserver-users at .osgeo
> > http://lists.osgeo.org/mailman/listinfo/mapserver-users
> > _______________________________________________
> > mapserver-users mailing list
> > mapserver-users at .osgeo
> > http://lists.osgeo.org/mailman/listinfo/mapserver-users
> > 
> 
> 
> --
> View this message in context: 
> http://osgeo-org.1803224.n2.nabble.com/Reaspect-tp6953208p6955963.html
> Sent from the Mapserver - User mailing list archive at Nabble.com.
> _______________________________________________
> mapserver-users mailing list
> mapserver-users at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>