Re: [udig-users] Label Priority

[Rorie Overby <roverby@xxxxxxxxxxxxx>]

Thanks Ugo,

I tried adding a Priority expression to prioritize city labels by 
POPULATION as follows:
                       <sld:Priority>
                           <ogc:PropertyName>POPULATION</ogc:PropertyName>
                       </sld:Priority>

and it works, but it does not pass the validation test:
      (line 123, column 39)cvc-complex-type.2.4.d: Invalid content was 
found starting with element 'sld:Priority'. No child element is expected 
at this point.

And, after applying the style and closing the style editor, I go back to 
make more edits to the xml and the above lines are changed to this:
                      <sld:Priority>
                           <sld:PropertyName>
                               <ogc:PropertyName/>
                           </sld:PropertyName>
                       </sld:Priority>

Do you see any issues with the SLD I'm using?

Ugo Taddei wrote:
> Hello Rorie,
>
> Rorie Overby wrote:
> > Does anyone know how uDig determines label priority? I've tried to 
> > use multiple rules in the sld xml, first rule to draw larger cities, 
> > second to draw smaller ones, but uDig seems to prioritize the smaller 
> > cities regardless of the order of the rules. I've also tried using 
> > two layers, but the smaller cities are still drawn over the larger 
> > ones, even when the smaller cities layer is below the larger cities.
>
> I think udig has its own label painter (with its own intelligence), 
> and might be messing around with your style. But that's just a 
> thought. Another thought is: sld is very complex, so your style might 
> not be correct...
>
> Anyway, you want to have a look at
>
> http://geoserver.org/display/GEOSDOC/LabelingOptions
>
> which has wonderful examples for what you're trying to do. I think 
> it's mainly about vendor options, but the code is in geotools (thus in 
> udig), so you should be able to profit from it. (Matter of fact, I've 
> used vendor options writing designing my own styles with udig.)
>
> > Another question I have regarding label priority is if there is any 
> > way to define the label order by a layer's attributes, like (order by 
> > 'POPULATION' desc)?
> >
> > Thanks in advance,
> >
> > rorie
>
> Cheers,
>
> Ugo