[Mapserver-users] WMS GetLegendGraphic and KEYIMAGE

[Kralidis,Tom [Burlington]]

> -----Original Message-----
> From: Yewondwossen Assefa [mailto:assefa at dmsolutions.ca] 
> Sent: Thursday, July 08, 2004 4:00 PM
> To: Kralidis,Tom [Burlington]
> Cc: mapserver-users at lists.gis.umn.edu
> Subject: Re: [Mapserver-users] WMS GetLegendGraphic and KEYIMAGE
> 
> 
> Tom,
> 
>   I understand what you suggest but at the same time, the keyimage is 
> just an additional way to generate icons beside the defaut way of 
> generating them (using classes defined on the layer). Thus the use of 
> the legend's  keysizex and keysizey is the one that make more 
> sense. If 
> we add a specific size parameters for layers using a 
> keyimage, we need 
> to do the same for other types of layers so we can generate icons of 
> diffrent siezes. What I propose as a compromise is to maybe use a 
> metadata at the layer level that would be used by the 
> LegendURL to fetch 
> the width and height for that specific layer. By default the 
> LegendURL 
> would use the legend's keysizex/keysizey.  Is this acceptable ?
> 

Yes.  Bottom line is, from an OGC client point of view, is that
Capabilities should provide me with everything I need to know about a
service without apriori knowledge (also hence the need for WMS
Capabilities to expose LegendURL, MetadataURL, and DataURL).

Cheers

..Tom

> Later,
> 
> Kralidis,Tom [Burlington] wrote:
> 
> > 
> >>-----Original Message-----
> >>From: Yewondwossen Assefa [mailto:assefa at dmsolutions.ca]
> >>Sent: Wednesday, July 07, 2004 2:14 PM
> >>To: Kralidis,Tom [Burlington]
> >>Cc: mapserver-users at lists.gis.umn.edu
> >>Subject: Re: [Mapserver-users] WMS GetLegendGraphic and KEYIMAGE
> >>
> >>
> >>If it is for a specific layer, why not use the width and height
> >>parameters in the request ? Do you have other suggestions ?
> >>
> > 
> > 
> > I could explicitly, however if I'm a WMS client, my first 
> inclination 
> > is to do a GetCapabilities, and go from there.  This is where 
> > LegendURL would be useful.
> > 
> > I suggest a KEYIMAGESIZE be added so that when LegendURL does get 
> > added to WMS GetCapabilities, that the width and height 
> attributes are 
> > taken from KEYIMAGESIZE (or, even better, if MapServer can 
> figure out 
> > the KEYIMAGE value extents :))
> > 
> > What do you think?
> > 
> > ..Tom
> > 
> > 
> > 
> >>Kralidis,Tom [Burlington] wrote:
> >>
> >>
> >>>Right, but doesn't the legend object define a legend for
> >>
> >>the *entire*
> >>
> >>>WMS?  This is a specific layer level legend KEYIMAGE --
> >>
> >>i.e. I don't
> >>
> >>>want all my legend image dimensions to be the size of the
> >>
> >>KEYIMAGE in
> >>
> >>>the one layer.
> >>>
> >>>..Tom
> >>>
> >>>
> >>>
> >>>
> >>>>-----Original Message-----
> >>>>From: Yewondwossen Assefa [mailto:assefa at dmsolutions.ca]
> >>>>Sent: Wednesday, July 07, 2004 10:21 AM
> >>>>To: Kralidis,Tom [Burlington]
> >>>>Cc: mapserver-users at lists.gis.umn.edu
> >>>>Subject: Re: [Mapserver-users] WMS GetLegendGraphic and KEYIMAGE
> >>>>
> >>>>
> >>>>Tom,
> >>>>
> >>>>  Here is how the size is determined :
> >>>>    -  If Width and Height parameter are passed in the 
> >>>>GetLegendGraphic request , they will be used.
> >>>>    - If not, it will use the size oparameters in the 
> legend object
> >>>>    - if none of the above is valid, the defaut size will 
> be 20/20.
> >>>>
> >>>>Later,
> >>>>
> >>>>Kralidis,Tom [Burlington] wrote:
> >>>>
> >>>>
> >>>>
> >>>>>Hi,
> >>>>>
> >>>>>I've created a WMS, which has a layer, which defines
> >>>>
> >>>>KEYIMAGE in the
> >>>>
> >>>>
> >>>>>CLASS object.
> >>>>>
> >>>>>>From what I understand, KEYIMAGE points to a static 
> image file, so
> >>>>>
> >>>>>
> >>>>>>when
> >>>>>
> >>>>>requesting a legend (either through OGC:WMS or classic mapserv 
> >>>>>mode=legend), the static image is fed back.
> >>>>>
> >>>>>When I request GetLegendGraphic from my WMS layer with
> >>>>
> >>>>KEYIMAGE, the
> >>>>
> >>>>
> >>>>>image comes back really small (i.e. 20 x 10).  My legend
> >>>>
> >>>>image is like
> >>>>
> >>>>
> >>>>>300 x 50 -- the output image looks like it scrunched 
> into 20 x 10.
> >>>>>
> >>>>>Suggestions?
> >>>>>
> >>>>>Thanks
> >>>>>
> >>>>>..Tom
> >>>>>
> >>>>>_______________________________________________
> >>>>>Mapserver-users mailing list Mapserver-users at lists.gis.umn.edu
> >>>>>http://lists.gis.umn.edu/mailman/listinfo/mapserver-users
> >>>>>
> >>>>
> >>>>
> >>>>--
> >>>>----------------------------------------------------------------
> >>>>Assefa Yewondwossen
> >>>>Software Analyst
> >>>>
> >>>>Email: assefa at dmsolutions.ca
> >>>>http://www.dmsolutions.ca/
> >>>>
> >>>>Phone: (613) 565-5056 (ext 14)
> >>>>Fax:   (613) 565-0925
> >>>>----------------------------------------------------------------
> >>>>
> >>>>
> >>>>
> >>>
> >>>
> >>>
> >>
> >>--
> >>----------------------------------------------------------------
> >>Assefa Yewondwossen
> >>Software Analyst
> >>
> >>Email: assefa at dmsolutions.ca
> >>http://www.dmsolutions.ca/
> >>
> >>Phone: (613) 565-5056 (ext 14)
> >>Fax:   (613) 565-0925
> >>----------------------------------------------------------------
> >>
> >>
> >>
> > 
> > 
> > 
> 
> 
> -- 
> ----------------------------------------------------------------
> Assefa Yewondwossen
> Software Analyst
> 
> Email: assefa at dmsolutions.ca
> http://www.dmsolutions.ca/
> 
> Phone: (613) 565-5056 (ext 14)
> Fax:   (613) 565-0925
> ----------------------------------------------------------------
> 
> 
>