[mkgmap-dev] problem with splitter and bounding polygon

Sun Mar 6 15:32:51 GMT 2016

Hi Andrzej,

okay, good points. That would probably also happen with a simple input filter
in mkgmap. I'll see if I can improve splitter, I think it should be possible.

Gerd

________________________________________
Von: mkgmap-dev-bounces at lists.mkgmap.org.uk <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Andrzej Popowski <popej at poczta.onet.pl>
Gesendet: Sonntag, 6. März 2016 15:49
An: mkgmap-dev at lists.mkgmap.org.uk
Betreff: Re: [mkgmap-dev] problem with splitter and bounding polygon

Hi Gerd,

> We already have UnusedElementsRemoverHook.java which magically
> detects elements in the input file which will not appear in the
> output file. If we change this filter to check against a poly
> instead of a bbox it might be good enough.

I have already tested something like that, I have extracted USA using
osmosis and bounding poly. I don't like results, mostly because
filtering is not precise. For example I can get a full lake area on a
map but all object on an island are missing, because they are entirely
outside poly, while lake is partially inside. Or I can get contours,
where missing middle part is replaced by a straight line.

If you are thinking about filtering in mkgmap or splitter, then I would
prefer it as a precise cut and trim with bounding poly.

--
Best regards,
Andrzej
_______________________________________________
mkgmap-dev mailing list
mkgmap-dev at lists.mkgmap.org.uk
http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev