[mkgmap-dev] closed ways and multi-polygon relations

Fri Nov 23 07:12:39 GMT 2018

Hi,

first I'd like to say it works as intended, see 
http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=1694

Unfortunately WanMil is no longer active here, so I have no way to ask him
why 
he deicded to use copies of the original ways instead of the joined way.
Anyway,
for ways with mkgmap:mp_created=true one should not use is_closed(), the
important information is in 
mkgmap:stylefilter.
I think the current implementation is not good because it creates lots of
objects instead of a few, maybe only one. Each one is processed in the style
and later the mergel-ine algo tries to put them together again.

Gerd

popej wrote
> Hi Gerd,
> 
>  > are in fact copies of the original way members of the MP and those are
>  > typically not closed
> 
> I see 3 possible solutions:
> 1. Convert multipolygon ways to a proper, continuous outline.
> 2. Return is_closed() as true, when mkgmap:mp_created is true.
> 3. Add info to documentation, that lines with mkgmap:mp_created=true are 
> part of a closed outline, but not necessary result in is_closed()=true.
> 
> I would suggest solution 3.
> 
> I assume that is_closed() means, that object could be a polygon, while 
> mkgmap:mp_created=true or area=yes describe a more complex object, but 
> essentially a kind of polygon too.

--
Sent from: http://gis.19327.n8.nabble.com/Mkgmap-Development-f5324443.html