[Gdal-dev] MrSID on MapServer w/ FWTools 0.9.9

[Richard Greenwood]

On 8/16/05, Frank Warmerdam <fwarmerdam at gmail.com> wrote:
> On 8/16/05, Richard Greenwood <richard.greenwood at gmail.com> wrote:
> > First, thanks Frank for the new FWTools!
> >
> > Second, sorry to bother this list with such a seemingly simple
> > problem, but I am not able to get mapserver to display MrSID with the
> > FWTools 0.9.9. Gdalinfo recognizes sid files, but thus far mapserver
> > does not. I have set GDAL_DRIVER_PATH and also tried copying all the
> > dll's into the mapserver directory.
> >
> > Third, I'm not trying to set up a production server, I just want to do
> > a quick test of MrSID performance with mapserver. In the past I found
> > it to be unacceptably slow when working with a large (423MB) sid file.
> > If anyone has recent experience to the contrary I would be interested
> > to hear it.
> 
> Rich,
> 
> I have clients who with various fixes through the spring and
> summer have achieved respectible, if not exceptional speed
> from large MrSID files.  The fixes were quite important.
> 
> There is still the issue that 3 passes are made over RGB files
> instead of just 1.
> 
> I don't know why things aren't working with MapServer.  I would
> assume it is something missing from the environment, a permissions
> problem or a DLL not in the right place.

Thanks, I'll keep working on it. Sometimes I miss the obvious, so I
figured I'd ask before I spent more time chasing DLLs, etc.

Regarding my past performace issue with MrSID and mapserver -  I have
a 95930x104860 RGB sid that displayed quite quickly at full extent,
but the cloaser the user zoomed in, the slower it got. However, this
was with mapserver and gdal builds of a year or more ago.
Unfortunately, I still have the same 95930x104860 sid, and thus the
new FWTools 0.9.9 caught my eye as a possible solution to displaying
this ugly file.

As always, thanks for your prompt and insightful rplies.

Rich

-- 
Richard Greenwood
richard.greenwood at gmail.com
www.greenwoodmap.com