[mapserver-users] html legend not working

[Rahkonen Jukka (MML)]

Hi Raffaele, 

After doing some research, you are right and html legends do not belong to WMS but only to Mapserver CGI which I have never used myself.  Reasoning:

1) From WMS 1.1.1 specification OGC 01-068r3, page 54:
7.5 GetLegendGraphic (SLD WMS only)
The optional GetLegendGraphic operation applies only to a Styled Layer Descriptor
WMS. See the SLD specification [3] for this operation.

2) From Styled Layer Descriptor Implementation Specification (v. 1.0.0), OGC 02-070, page 72:
FORMAT: This gives the MIME type of the file format in which to return the
legend graphic. Allowed values are the same as for the FORMAT=
parameter of the WMS GetMap request.

Same text is in SLD 1.1.0 specification. Because html is not a possible format for GetMap it is not possible to use is for GetLegendGraphic either.

What remains is a small Mapserver bug with the wms_getlegendgraphic_formatlist metadata item because GetCapabilities may advertise different formats than those which are really supported.

-Jukka Rahkonen-



-----Alkuperäinen viesti-----
Lähettäjä: mapserver-users-bounces at lists.osgeo.org [mailto:mapserver-users-bounces at lists.osgeo.org] Puolesta Raffaele Morelli
Lähetetty: 4. elokuuta 2015 12:29
Vastaanottaja: mapserver-users at lists.osgeo.org
Aihe: Re: [mapserver-users] html legend not working

On 04/08/15 at 08:34am, Rahkonen Jukka (MML) wrote:
> Raffaele Morelli wrote:
> 
> 
> > Reply to myself because I've found it's not a mapserver related issue but a geomoose one (no matter about LEGEND and TEMPLATE statements it always produces a png image) .
> 
> I don't quite agree.  If GeoMoose is always making the GetLegendGraphic request by using image/png as a format then it is naturally getting a png image back. But so far I have not discovered how to make Mapserver to support html as one of the supported WMS GetLegendGraphic formats and what the WMS client should then use as a format in &format= parameter so there is also a Mapserver related aspect.

I won't say that, doc is very clear about WMS request returning an image:

[quote]
GetLegendGraphic: returns a legend image (icon) for the requested layer, with label(s).
More information on this request can be found in the GetLegendGraphic section later in this doc.


GetLegendGraphic Request

This request returns a legend image (icon) for the specified layer. The request will draw an icon and a label for all classes defined on the layer. If the requested layername is a GROUP-name, all included layers will be returned in the legend-icon.

[/quote]


GeoMoose is doing a WMS request so no error on Mapserver side (and after all) nor on the GeoMoose one.

TEMPLATE statement works well (returning html legend) when doin a cgi request.

/raffaele





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