[mkgmap-dev] White stripes in the sea

Wed Jan 2 20:42:31 GMT 2013

Hi WanMil,

> What you see is the result of the multipolygon algorithm that cuts the 
> sea areas into distinct polygons to cut out the land area. The white 
> stripes are the polygon lines. But there is no space between the 
> polygons. So obviously that should not the problem. The problem is that 
> Garmins draw algorithm seems to create the white lines.

well, sorry, I meant the thin areas, not the white stripes between. These thin areas 
are likely to be thrown away when coordinates are rounded. I think
this explains the white stripes that I see in the QLandkarte GT screenshot.

> 
> Once again: It does not make sense to improve the PrecompSeaGenerator 
> because the main task it does is to calculate the multipolygons. And so 
> the only thing that could be improved is the mp algorithm itself.
> 

yes, I agree. So I'll try to find a better mp algorithm.

Gerd

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