[Mapserver-users] OGC WMS GetfeatureInfo - MapServer 4.2

[Kralidis,Tom [Burlington]]

> -----Original Message-----
> From: mapserver-users-admin at lists.gis.umn.edu 
> [mailto:mapserver-users-admin at lists.gis.umn.edu] On Behalf Of 
> Julien, Heryk
> Sent: Friday, July 16, 2004 11:10
> To: 'mapserver-users at lists.gis.umn.edu'
> Subject: RE: [Mapserver-users] OGC WMS GetfeatureInfo - MapServer 4.2
> 
> 
> Thanks for the clarification.
> But, I do think having "layers" and "query_layers" is a 
> redundant since a GetFeatureInfo request doesn't generate a 
> map. But now I understand that this is imposed by the OGC 
> spec, not MapServer. BTW, thanks Tom for your course on 
> MapServer's OGC configurations last spring in Ottawa. Your 
> examples where very useful.
>

Merci beaucoup.  Note that the "MapServer and OGC Services" Workshop given at OSGIS2004/MUM2 is posted on the conference proceedings page, and I will be actively updating / maintaining it as changes/updates/etc. occur in MapServer (WCS is next :)).  If anyone is interested in helping out, you know where to find me.

Cheers

..Tom
 
=========================
Tom Kralidis
Systems Scientist
Environment Canada
Tel: +01-905-336-4409
http://www.ec.gc.ca/

> Héryk Julien
> GSC-Québec
> NRCan
> 
> 
> -----Message d'origine-----
> De : Daniel Morissette [mailto:dmorissette at dmsolutions.ca]
> Envoyé : 15 juillet, 2004 17:54
> À : Julien, Heryk
> Cc : mapserver-users at lists.gis.umn.edu
> Objet : Re: [Mapserver-users] OGC WMS GetfeatureInfo - MapServer 4.2
> 
> 
> Julien, Heryk wrote:
> > 
> > So I'm passing the same information in two different parameters 
> > (Query_Layers and Layers)! In table 9 (The Parameters of a 
> > GetFeatureInfo Request p.40) of the OGC specs 
> > (http://www.opengis.org/docs/01-068r3.pdf) the layers param is not 
> > needed in a GetFeatureInfo request.
> > 
> 
> A GetFeatureInfo is performed by clicking on a map produced using a 
> GetMap call, so you need to indicate to the server which map 
> you clicked 
> on, that's why you need to carry the GetMap requests.
> 
> The parameters listed in table 9 are only those you need to 
> add on top 
> of the corresponding GetMap parameters. This is indicated, 
> but maybe not 
> clearly enough, in 7.3.1 page 39:
> 
>    "Because the WMS protocol is stateless, the GetFeatureInfo request
>     indicates to the WMS what map the user is viewing by 
> including most
>     of the original GetMap request parameters (all but VERSION and
>     REQUEST)."
> 
> Of course LAYERS may be considered redundant in this context, 
> but there 
> may be contexts that I can't think of right now where it is 
> useful, so 
> instead of documenting a bunch of exceptions the spec just 
> says: "start 
> with the GetMap parameters, and add the GetFeatureInfo 
> parameters on top."
> 
> Note that in QUERY_LAYERS you should only pass the layers you want to 
> query, this will often be a subset of the LAYERS parameter.
> 
> HTH
> 
> Daniel
> -- 
> ------------------------------------------------------------
>   Daniel Morissette               dmorissette at dmsolutions.ca
>   DM Solutions Group              http://www.dmsolutions.ca/
> ------------------------------------------------------------
> 
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