[mkgmap-dev] problem with highways as multipolygons

Sat May 9 17:03:51 BST 2015

Hi Andrzej,

can't test right now, but I really think that apply adds to the artificial 
members of mp-relations. I am not 100% sure that it doesn't change
the original members, but I would be suprised.

Reg. your patch:
Do I get this right that you don't want to make these areas routable?
I understand that routing through areas doesn't work very well 
right now but if you remove these ways from the network you'll see
real gaps. I think we should rather always allow routing.

Gerd

Date: Sat, 9 May 2015 17:31:24 +0200
From: popej at poczta.onet.pl
To: mkgmap-dev at lists.mkgmap.org.uk
Subject: Re: [mkgmap-dev] problem with highways as multipolygons

Hi Gerd,

 > The apply tells mkgmap to add the tag area=yes to the members,
 > and I think that's what you want.

This was my first thought too, but:

 > Note that the members of the
 > mp-relation are not the members of the original OSM relation, they
 > are the artifical ways.

"Apply" adds tags to original members while I have problems with 
artificial ways. Artificial ways inherit tags form original relation, so 
I would expect, that tags added to relation would appear in artificial 
ways. As you explained, this is no true.

"Apply" would work if there were created corresponding artificial 
relation too.

I think it's ok, that multipolygon appears as polyline and polygon. That 
way we can create object for boundary and for area. Problem appears, 
when multipolygon has no "area" tag, which is quite possible, since 
multipolygon implies area. I have added a rule to correct this problem:
highway=* & mkgmap:mp_created=true {add area=yes;}

See attached patch, which corrects footway, path and steps with area too.

Often highway=service is marked as area, but I think it could be usable 
to draw a road around area.

-- 
Best regards,
Andrzej

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