[mkgmap-dev] issues with tile boundaries

Sun Mar 24 07:38:26 GMT 2013

Hi Minko,

I looked at this and I think that I know the reason for these problems:
A typical tile produced by splitter is split into several sub divisions.
Each sub division has a bounding box, and the coords of the background
polygon are saved
as rounded offsets to the subdivision bbox.
If I got this right, the problem occurs because sometimes the rounded values
differ.

I guess this could also explain the white lines in the sea. I don't know yet
if or where this can be fixed...

Gerd

Minko-2 wrote
> Hi Gerd,
> 
> I have another related (cosmetic) issue with tile borders which exists
> already some time (november 2011) but maybe you can have a look at it?
> 
> You can see the issue on every map in Mapsource when you select the tiles.
> They get a yellow border, but not only in the outlines, but sometimes
> inside the tiles too. 
> See https://dl.dropbox.com/u/64716698/OSM/mkgmap/tileborders1.jpg
> 
> In Basecamp, you can see it as thin blue lines, when you browse a
> gmapsupp.img from micro Sd card or GPS:
> https://dl.dropbox.com/u/64716698/OSM/mkgmap/tileborders2.jpg
> 
> When you zoom on it, sometimes the map disappears, but the maps are still
> routable.
> https://dl.dropbox.com/u/64716698/OSM/mkgmap/tileborders3.jpg
> 
> As far as I know, it is not style or typ file related.
> 
> It happened after this patch was committed:
> http://www.mail-archive.com/

> mkgmap-dev at .org

> /msg10872.html
> 
> It fixed the transparency of the gmapsupp.img and "ghost shading" of the
> overview map in mapsource.
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> mkgmap-dev at .org

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