WMS: non square pixels performance

[Bart van den Eijnden (OSGIS)]

Hi Frank,

I've tested your change and the speedup is really big. Thanks.

I've opened up ticket 2084 for this:
http://trac.osgeo.org/mapserver/ticket/2084

Best regards,
Bart

--
Bart van den Eijnden
OSGIS, Open Source GIS
http://www.osgis.nl


--------- Oorspronkelijk bericht --------
Van: Frank Warmerdam <warmerdam at POBOX.COM>
Naar: MAPSERVER-USERS at LISTS.UMN.EDU <MAPSERVER-USERS at LISTS.UMN.EDU>
Onderwerp: Re: [UMN_MAPSERVER-USERS] WMS: non square pixels performance
Datum: 02/05/07 19:08

> Eijnden, Bart van den (AGI) wrote:
> &gt; Hi Frank,
> &gt; 
> &gt; the data (shape file) can be downloaded from here (about 20 Mb):
> 
> Bart,
> 
> Whew, that is a big slow down!  It seems that the projection you are using
> is very expensive computationally, and it was being applied twice per
> point unecessarily so that the rescaling needed for non-square pixels
could
> be applied.
> 
> I have applied a change in mapproject.c to short circuit this reprojection
> work that brings down the slow case to only about 50% more time than the
> fast case.  If you can easily test with trunk or perhaps incorporate this
> change into the source you are building from that would be appreciated.
> 
>    http://trac.osgeo.org/mapserver/changeset/6075
> 
> If it works well for you, I'd be inclined to incorporate this fix into
> MapServer 4.10.2 but I'll need a ticket in trac to reference.
> 
> Best regards,
> -- 
>
---------------------------------------+--------------------------------------
> I set the clouds in motion - turn up   | Frank Warmerdam,
warmerdam at pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush    | President OSGeo, http://osgeo.org
> 
>