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List:       mapserver-users
Subject:    Re: [mapserver-users] max size of raster via WCS GetCoverage request
From:       Stephan =?ISO-8859-1?Q?Mei=DFl?= <stephan () meissl ! name>
Date:       2011-10-24 12:01:25
Message-ID: 1319457685.1208.281.camel () io
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John, Jukka,

I confirm that a check for the MAXSIZE directive was introduced for WCS
in version 6.0 (see #3204). At the moment there's no possibility to set
the values independently for WMS and WCS. I started to think about a
more clever method of limiting WCS responses based on the result volume.
E.g. a RGB image of same pixel size is way smaller than a multiple bands
float32 coverage. What are your requirements for such a limiting
mechanism?

Btw. you might be interested in version 2.0 of the WCS standard which is
also supported by MapServer.

cu
Stephan


On Fri, 2011-10-21 at 20:04 +0000, Rahkonen Jukka wrote: 
> For our server the practical limit is somewhere around 5000x5000 pixels which makes \
> 75 MB per image.  Our users have been satisfied with that so I have not bothered to \
> study how to increase the limit.  If the outputformat is geotiff the images can be \
> easily combined later. Users are downloading aeriel images for local use by sending \
> the bounding box and desired output resolution. Stay with WCS 1.0 if you do not \
> have any very special needs, WCS 1.1.0 is an odd invention as a standard. 
> -Jukka Rahkonen-
> 
> John Cartwright wrote:
> 
> > Thanks for your quick response Jukka.
> 
> So the MAXSIZE sets the maximum size of the map image (e.g. WMS request)
> as well as the size of the raster downloaded  with a WCS GetCoverage
> request?  There's no provision to allow a larger data download than map
> image?
> 
> This seems to have changed sometime between 5.6.3 and 6.0.1, but I
> didn't see mention in the release notes.
> 
> --john
> 
> On 10/21/2011 01:17 PM, Rahkonen Jukka wrote:
> > Hi,
> > 
> > See MAXSIZE http://mapserver.org/mapfile/map.html
> > 
> > -Jukka Rahkonen-
> > 
> > John Cartwright wrote:
> > 
> > 
> > > Hello All,
> > > I'm finding that a WCS GetCoverage request which results in a large grid
> > > works on mapserver 5.6.3, but on 6.0.1 returns an error message:
> > > msWCSGetCoverage(): WCS server error. Raster size out of range, width
> > > and height of resulting coverage must be no more than MAXSIZE=2048.
> > > Is there a way to alter this limit in the mapfile?
> > Thanks!
> > 
> > --john
> > 
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