[mkgmap-dev] ways are deleted when not routable

Mon May 13 09:20:26 BST 2013

Hi all,

the problem is not directly related to oneways. Here is what happens:
The merge-line method merges some OSM ways, but it doesn't care about the direction of parallel lines or loops and it may also
remove the preserved flag from a point that connnects two lines.
In this special case, it joins the points of the OSM ways 6971876,  120708547, 6971870, 120708550, and 6971878 
to form a rather small circle plus a long line:

d-------------------------------x--c
                                a--b

The merged line starts at point x (!) and goes via a,b,c, back to x and then to d.
The Douglas-Peucker-Filter finds that the small loop is all within the error tolerance and removes it, 
so that the remaining way is the line between x and d.
d-------------------------------x

I've committed r2606 to fix this error. Whenever the merge-lines method merges two lines, it sets the preserved flag for the connection point.
This solves the problem and causes only a small increase of the img size.

Gerd

> Date: Mon, 13 May 2013 09:13:15 +0200
> From: ligfietser at online.nl
> To: mkgmap-dev at lists.mkgmap.org.uk
> Subject: Re: [mkgmap-dev] ways are deleted when not routable
> 
> The lines are gone, even if I look with gpsmapedit there is nothing.
> I've even tried to delete the oneway attribute before treating the trunk road, but this doesn't solve it.
> 
> > > Don't know if this has anything to do with the disappearing lines
> > > though as that seems a bit odd... Are the lines really in the map
> > > and
> > > just not displayed by mapsource etc.?
> > 
> > I'll have a closer look again.
> > 
> > Gerd
> _______________________________________________
> mkgmap-dev mailing list
> mkgmap-dev at lists.mkgmap.org.uk
> http://lists.mkgmap.org.uk/mailman/listinfo/mkgmap-dev

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.mkgmap.org.uk/pipermail/mkgmap-dev/attachments/20130513/b9a895ee/attachment-0001.html 