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Multipolygons of landuses/naturals should be visible
http://forum.navit-project.org/viewtopic.php?f=13&t=396
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Author:  efred [ 12 Jun 2013, 14:21 ]
Post subject:  Multipolygons of landuses/naturals should be visible

I know, there exists a trac (754) for this problem. But I would like to post it here, anyway:
Really a lot of landuses and naturals are taggt in OSM as Multipolygon Relations. And there will be more and more. But maptool/navit can't handle them and these areas aren't visible (p.e. lakes, riverbanks, forests, residentials, etc). It would be nice, if navit/maptool would handle in future the Multipolygon Relations.

Author:  usul [ 12 Jun 2013, 17:10 ]
Post subject:  Re: Multipolygons of landuses/naturals should be visible

I made a ping at the corresponding TRAC ticket :)

I have no clue, how maptool works internaly and what the patch changes in detail. As Multipolygone support can be tricky (if it's not considered from the very beginning), there might be a workaround usefull for the first time:
1. Get all multipolygone relations
2. Copy all OSM tags to the child objects itself
This will work for outer elements, but will make troubles for inner (so non existing) areas.

Author:  Mapmapper [ 28 Sep 2013, 23:32 ]
Post subject:  Re: Multipolygons of landuses/naturals should be visible

Is there something ongoing? I want to try to resolve the outers of Multipolygones to easy Polygones. At first with java, a step before Maptool. Later then in Maptool, perhaps.

Author:  usul [ 29 Sep 2013, 10:33 ]
Post subject:  Re: Multipolygons of landuses/naturals should be visible

At least I found another bug concerning multipolygones #1172.

As Navit has just a very smal team and only a few of them are able to contribute with code, you need to be patient for a analyses/fix.
If you have the time to help on anything in that special case, joining the IRC might be very good! If you would post some updates on the progress here or at the tickets, this would be excellent :)

Author:  efred [ 13 Mar 2017, 15:53 ]
Post subject:  Re: Multipolygons of landuses/naturals should be visible

its a long time ago... Today I've thinked, I will test, if Navit can handle Multipolygons, now... So I compiled the newest version and created a map.
But I saw, the maps looks so bad now. Still no Mutlipolygones.
Its really a big problem, because there are a lot of landuses and naturals tagged as MPs. So the navit-maps looks really ugly. See the Screenshots for compare:
1. Lakes as MPs are not visible
2. Forests as MPs are not visible
3. Residentials are not visible

Attachments:
File comment: Navit
OSM_Duedingen_Navit.png
OSM_Duedingen_Navit.png [ 174.72 KiB | Viewed 594 times ]
File comment: Mapnik-Rendering
OSM_Duedingen_Mapnik.png
OSM_Duedingen_Mapnik.png [ 187.99 KiB | Viewed 594 times ]

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