[Mapserver-users] WMS server image black padding and aspect ratio

[Eric Sokolowsky]

On Fri, 23 Jan 2004, Daniel Morissette wrote:

> Eric Sokolowsky wrote:
> > I am running mapserver 4.0.1 but this aspect also appears with the 
> > version in CVS.  I am using mapserver as a WMS server on a Red Hat Linux 9
> > system.  When I request an image that is not the same aspect ratio as
> > the original image on the server, it seems that the image I get is
> > not stretched so that it fills the entire frame.  The aspect ratio of the
> > original source is maintained and black bars either appear above and below
> > or else on both sides, similar to the effect of watching widescreen movies 
> > on a regular TV.  Is this the intended behavior, and if so, is there a way
> > to turn it off?
> > 
> 
> The short answer is that MapServer doesn't support rendering maps with 
> different X and Y scales.  This is one of the only issues with MapServer 
> before it passes all the OGC WMS tests.

This is most unfortunate.  It is absolutely critical for my application
to allow this.  Most of the images that I want to serve have different
X and Y scales, and it would be very difficult to rescale all of them.
Also, even if I rescaled all of the images, it would not solve the problem
of requesting a different aspect ratio bounding box.

Is there work being done to fix this problem?  I am willing to jump into
the code to try and find a way to solve it, but I am not familiar with
the code and it may take me a while to get up to speed with it.

> For the long story, see the following thread in the archives:
> http://mapserver.gis.umn.edu/data2/wilma/mapserver-users/0401/msg00105.html
> 
> Daniel
> 

-- 
    ____   __     Eric Sokolowsky    (GST)  NASA Goddard Space Flight Center 
   / __/__/_/__  Visualization Programmer    Scientific Visualization Studio
  / __/ _/ / _/ 301.286.3751                  Mailstop 935.0 Bldg 28 Rm E102
 /___/_//_/__/ eric.sokolowsky at gsfc.nasa.gov   Greenbelt, MD 20771