[mapserver-users] Admin boundaries styling

[Rahkonen Jukka]

Hi,

Would it be acceptable to create a new dataset for rendering the borders by converting polygons into linestrings and merging the overlapping segments?  With OpenJUMP you cound do it with a single operation Tools - Edit Geometry - Convert - Extract Segments. Select option "Merge resulting segments" and you've done it.

-Jukka Rahkonen-

Frank Broniewski wrote:
 
> Hi,
> 
> I'm trying to get the styling right for administrative boundaries. The data source
> is a polygon shapefile with administrative boundaries of a certain level. I want to
> have a dashed line style to symbolize the boundary. The layer is used as TYPE
> LINE.
> 
> 
> The style I'm using:
> 
> STYLE
>   Color 100 100 100
>   Gap 4
>   Linecap butt
>   Linejoin miter
>   Linejoinmaxsize 3
>   Pattern 2 6 2 6 2 6 End
>   Symbol "circle"
>   Width 2
> END
> 
> Problem is that the pattern overlaps where a boundary is drawn more than once
> due to the shared nature of adjacent adminstrative units.
> Since the source is a shapefile there's no topology that would prevent the issue
> and my PostGis DB doesn't support that (yet)*. Here's a screenshot that displays
> the issue:
> http://www.geometrico.lu/devel/mapserver/boundary-styling.png
> As you can see the styling varies greatly. So - does anyone have a clue on how to
> get the styling right? It should look like in the lower right corner of the
> screenshot ...
> 
> Many thanks,
> 
> Frank
> 
> 
> * BTW: can Mapserver handle PostGIS topology geometry types?
> 
> 
> - --
> Frank BRONIEWSKI
> 
> METRICO s.à r.l.
> géomètres
> technologies d'information géographique
> rue des Romains 36
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> 
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