WMS output formats

[Yewondwossen Assefa]

I was just checking this and the bug is described in 
http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=455.

  I like the idea of using wms_format (or wms_advertized_format) to 
limit the formats that are used. As Frank mentionned, It would be a sort 
of a new fonctionnality but since the changes are are minimal and there 
was already a bug on it, it is sort of border line between bug and new 
addition. I would do it for this release though if peopole think it is 
appropriate.  What do you think Frank ?

Later,


Frank Warmerdam wrote:
> On 11/10/05, Alexandre Fellay <alexandre.fellay at camptocamp.com> wrote:
> 
>>I don't understand some aspects of the behavior of Mapserver (version 4.4.2) as
>>WMS server. My problem is as follows :
>>I want to publish one single raster layer, and only in jpeg format (all other
>>formats being unsuitable for various reasons). So I put in my mapfile
>>
>>IMAGETYPE jpeg
>>
>>I add an OUTPUFORMAT object :
>>
>>OUTPUTFORMAT
>>   NAME jpeg
>>   DRIVER "GD/JPEG"
>>   MIMETYPE "image/jpeg"
>>   IMAGEMODE RGB
>>   FORMATOPTION QUALITY=88
>>   EXTENSION "jpg"
>>END
>>
>>and the required METADATA in my layer :
>>   METADATA
>>     "wms_title" "blabla"
>>     "wms_srs"   "EPSG:21781 EPSG:4326 EPSG:32632"
>>     "wms_server_version" "1.1.1"
>>     "wms_format" "image/jpeg"
>>     "wms_name" "blabla"
>>   END
>>
>>The surprise is in the GetCapabilities answer: other formats are advertised as well
>>       <Format>image/jpeg</Format>
>>       <Format>image/gif</Format>
>>       <Format>image/png</Format>
>>       <Format>image/png; mode=24bit</Format>
>>       <Format>image/wbmp</Format>
>>       <Format>image/tiff</Format>
>>
>>And, to make things worse, some wms clients (Gaia 2 for example) seem to have a
>>png default format, resulting in an ugly 8bit image.
>>
>>Is it possible to really limit the supported output formats list ?
> 
> 
> Alexandre,
> 
> This issue has come up from time to time, and Assefa has
> done some work to ensure that non-raster formats don't show up.
> But there is still no way to prevent default formats from appearing
> in the WMS capabilities.
> 
> Unfortunately, I'm not sure fixing this would count as
> a bug fix, so it might be stuck this way till 5.0.
> 
> BTW, as far as I can see the wms_format metadata is not
> defined for any purpose on the WEB metadata list.  It does
> play a role for WMS layers, determining what format remote
> results should be fetched as.
> 
> An obvious approach might be to allow the wms_format metadata
> item on the WEB object to determine a restricted list of formats
> offered via WMS.  I think something similar is already done for
> WCS, where you can currently restrict the list of formats offered.
> 
> 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    | Geospatial Programmer for Rent
> 
> 

-- 
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Assefa Yewondwossen
Software Analyst

Email: assefa at dmsolutions.ca
http://www.dmsolutions.ca/

Phone: (613) 565-5056 (ext 14)
Fax:   (613) 565-0925
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