[mkgmap-dev] problem with splitter and bounding polygon

Sun Mar 6 14:49:09 GMT 2016

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