[ka-Map-users] Increased Metabuffer results in multiple lables

[Melanie Ritzau]

Thanks for your suggestion,

although I have not found a way to stop the symbol artifacts appearing when MetaBuffer is set to zero. When a Point-Symbol (e.g. just a red circle) lies exactly at the edge of a rendered Meta-Tile - the red circle is drawn but also a red (unwanted) horizontal line that starts at the red symbol. This is a part of my mapfile:

I can't see any mistakes:

...

  SYMBOL
    NAME "circle"
    TYPE ELLIPSE
    FILLED TRUE
    POINTS
       1 1
    END
  END
...

LAYER
    NAME "Cities3"
    GROUP "Vector-Map"
    STATUS default
    DATA "Cities3"
    TYPE POINT
    CLASSITEM "Name"
    MAXSCALE 6920998
    MINSCALE  865124

    LABELITEM "Name"
    CLASS
      NAME "Cities3"
      LABEL
        PARTIALS FALSE
        TYPE TRUETYPE
	FONT arialbd
        SIZE 10
        SHADOWCOLOR 0 0 0
	SHADOWSIZE 3 3
        POSITION AUTO
        COLOR 255 255 255
        OUTLINECOLOR 0 0 0 
      END

      STYLE  # it makes no difference if the circle has a black outline
        SYMBOL "circle"
        COLOR 0 0 0
        SIZE 6
      END
      STYLE
        SYMBOL "circle"
        COLOR 255 0 0
        SIZE 4
      END
    END
  END

...

END






> 
> It seems like the fix you've tried, of increasing metabuffer size, is  
> not going in the right direction.  From what you've described, it  
> sounds  like the map tiles would no longer align properly unless they  
> are cropped before display in the browser. So I think you want to put  
> that back to 0, and then work on the symbol artifacts as a separate  
> issue.
> 
> I see a couple things in http://mapserver.gis.umn.edu/docs/reference/ 
> mapfile/label that may help in your mapfile.  The "PARTIALS" flag  
> should be set to false, to say that labels are not allowed to run off  
> the edge of the map (metatile).  I'm not sure if your symbols are  
> also treated as LABELs in your mapfile (it's been a while since I've  
> had my hands in the guts of this), but if they are, then the same  
> PARTIALS flag may apply to the symbols too and may cure the problem.
> 

> 
> --Mark
> 
> On May 9, 2007, at 3:01 PM, Melanie Ritzau wrote:
> 
> > Hi Mark,
> >
> > thanks for your help !!
> >
> > My problematic features are point-features - not polygons. Every  
> > point that falls into the buffer-zone is labeled twice because  
> > mapserver renders two tiles that contain
> > that point and on both tiles the point is labeled. If kamap!  
> > displays both tiles you can see two lables - one left and one right  
> > to the point.
> >
> > In tile.php is a part that tells mapserver not to place labels into  
> > bufferzone - but it should also tell mapserver not to render labels  
> > for points that fall into this buffer-zone.
> >
> > Setting the metabuffersize to 0 solves the label-problem but than I  
> > get artefacts on symbols that are at the edge of tiles.
> >
> > Maybe it would help to tell  mapserver to draw labels only to the  
> > right or left of the point but that would disturb the whole label- 
> > layout and it is not an option for me.
> >
> > Any ideas ?
> >
> > AFAIK it is not possible to configure a mapfile that way, that  
> > features at the edge of a tile don't get labeled. Right ?
> >
> > Thanks again !
> >
> > Mel
> >
> >
> >
> >
> >> -----Ursprüngliche Nachricht-----
> >> Von: Mark Torrance <marktorrance at yahoo.com>
> >> Gesendet: 09.05.07 19:00:50
> >> An: Melanie Ritzau <MelanieRitz78 at web.de>
> >> CC: ka-map-users at lists.maptools.org
> >> Betreff: Re: [ka-Map-users] Increased Metabuffer results in  
> >> multiple lables
> >
> >
> >>
> >> If you tell mapserver to label the points which are centroids of each
> >> polygon feature, rather than having it label the polygons themselves,
> >> then it will not get confused at the edges.  Each point (centroid)
> >> should fall in just one tile.
> >>
> >> --Mark
> >>
> >> On May 9, 2007, at 4:58 AM, Melanie Ritzau wrote:
> >>
> >>> Hi list,
> >>>
> >>> I increased the $metaBuffer size in config.php from 0 to 2 to avoid
> >>> rendering issues along the edge of the map image. The problem is
> >>> now that a lot of features (actually all that fall into the buffer
> >>> zone) are now labled twice. Is there any way to tell mapserver not
> >>> render lables into this buffer-zone ? Or any other solution ?
> >>>
> >>> Thank you very much for any hints,
> >>>
> >>> Regards,
> >>> Mel
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> >>
> >>
> >
> >
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> 
> 


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