[mapserver-users] Shapefiles with islands

[Rahkonen Jukka]

Hi,

My comments:

- Lakes in OSM data are in a very bad shape. Tagging habits and "multipolygon" relation thing do not work well at least with big lakes with islands.
- Maybe because the tagging of lakes and islands is not standardized the data extracts, for example "waters" in Cloudmade shapefiles, are close to useless. I have looked only shapefiles of Finland but I guess that situation is the same with data from Sweden.
- Have a look at OSM building polygons which are also multipolygon relations. Mapserver is drawing them fine. At least it does so for me with the set-up described here: http://trac.osgeo.org/mapserver/wiki/RenderingOsmData
- I think that problem is in the OSM lake data and/or Cloudmade extracts, not in Mapserver.

-Jukka Rahkonen-


> -----Alkuperäinen viesti-----
> Lähettäjä: mapserver-users-bounces at lists.osgeo.org 
> [mailto:mapserver-users-bounces at lists.osgeo.org] Puolesta 
> Lars Westerlind
> Lähetetty: 21. lokakuuta 2009 8:33
> Vastaanottaja: mapserver-users at lists.osgeo.org
> Aihe: SV: [mapserver-users] Shapefiles with islands
> 
> So,
> How is the lack of response to be interpreted? Nobody render 
> islands in lakes? Everybody make their own data extracts? Or 
> there are other (for me) hidden sources of information? 
> 
> /Lars
> 
> 
> -----Ursprungligt meddelande-----
> Från: mapserver-users-bounces at lists.osgeo.org 
> [mailto:mapserver-users-bounces at lists.osgeo.org] För Lars Westerlind
> Skickat: 19 October 2009 11:43
> Till: mapserver-users at lists.osgeo.org
> Ämne: [mapserver-users] Shapefiles with islands
> 
> Hi,
> I wonder if anyone renders islands in lakes? I use 
> OpenStreetMap Data, where lakes are tagged as multipolygons, 
> with islands as inner polygons.
> The source I use, mainly the "Mapserver recommended" 
> cloudmade make simple extracts where those inner polygons are 
> simply skipped, AFAIU.
> Looks rather funny for islands that are large enough to keep 
> some roads...
> 
> So, what is recommended? Should I make my own OpenStreetMap 
> extracts for this purpose? Or does anyone have any other good 
> sources? 
> 
> BTW,
> Do I understand correctly that multipolygon files must be 
> converted in order to be possible to handle by mapserver? I 
> mean, inner polygons should have at least an extra column in 
> the DBfile, telling it's level, or such? 
> 
> Regards,
> Lars
> 
> 
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