[mkgmap-dev] merge-lines and routing

Sun Apr 28 21:07:10 BST 2013

Hi Gerd,

the merge-lines happens for resolution >= 22 only. AFAIK the routing 
graph is based on resolution 24 only? So I would not expect a problem here?

Anyhow I am not sure. I started also some tests about routing (I did 
have the idea expand the merge-lines filter to the routing graph). I saw 
some roundabouts multiple times in the routing graph but I did not 
analyze this in detail. I think I will have a look on in within the next 
days...

WanMil

> Hi,
>
> the help file says
> merge-lines
> < ... >
> 	At the moment this option causes routing errors. Use only if routing
> 	is not needed in your map.
>
> Maybe I found the reason for the routing errors:
> If the segments of a road are merged, it might happen that the
> LineSplitterFilter has to split it because it has more than 250 points.
> The current implementation of LineSplitterFilter does this:
> The first part of a road is added as a road, all remaining parts are added
> as lines.
> With a simple change all parts are added as roads:
> Index: LineSplitterFilter.java
> ===================================================================
> --- LineSplitterFilter.java	(revision 2581)
> +++ LineSplitterFilter.java	(working copy)
> @@ -84,7 +84,7 @@
>   					log.debug("saving next part");
>   				l.setPoints(coords);
>   				next.doFilter(l);
> -				l = new MapLine(line);
> +				l = line.copy();
>
>   				count = 0;
>   				first = false;
>
>
>
> The interesting part for me is that the following routines seem to expect
> exactly this, but parts of the code was never executed.
> See also
> http://gis.19327.n5.nabble.com/PATCH-v1-highwayCount-tp5748554p5748864.html
>
> I also wonder if it really makes sense to limit the check "Non-routable way
> with routable type ..." to resolution 24. I'll try to find out more
> tomorrow.
>
> Gerd
>
>
>
> --
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