[mkgmap-dev] merge-lines and routing

Fri May 3 21:46:23 BST 2013

I have one problem with merge-lines - I often copy a road to put non 
routable overlays on it. Currently I think sometimes the merge-lines or 
some other filters are enacted on those copies - hence stuff like oneway 
arrows (non routable) will be having a different shape, than the 
underlying road.

I think I would need to have all ways that have a highway=* tag excluded 
at 24 (or make sure that if the way is done by using a continue/continue 
with_actions command - either before or after - will not be processed, 
or processed the same way as the highway).

So assuming a road with highway=tertiary & oneway=yes I create to lines 
(0x04 and 0x10650)

1.:
oneway=yes [0x10650 resolution 24 continue]
highway=tertiary [0x04 resolution 20]

both ways should be processed equally,

2.
highway=tertiary [0x04 resolution 20 continue]
oneway=yes [0x10650 resolution 24]

both ways should be processed equally again.

3.
however a way with railway=line & oneway=yes
oneway=yes [0x10650 resolution 24 continue]
railway=line [0x10651 resolution 22 continue]

should be processed, as they don't include a routable copy/origin 
created using continue command.

Therefore I think exclude all filtering that is not done to highway=* 
(or other definable keys) also for any other line that has a highway tag.
I haven't tried the patch yet (will do now) - but I think it could make 
this above problem worse....
On 03.05.2013 04:20, Gerd Petermann wrote:
> Hi WanMil,
>
> okay, this will be a big change that requires a branch. So, for now,
> I'd like to finish the merge-lines issue.
> Attached is version 2 of the patch that allows merging lines at all 
> resolutuions
> except for roads on res 24.
>
> Some numbers for a map of niedersachsen with default style and lots of 
> enabled features:
> (seconds run time,  gmapsupp.img size in bytes)
> r2581 with merge-lines: 99s, 127.567.872
> r2581 with no-merge-lines: 103s, 128.182.272
> patched r2585 with merge-lines: 95s, 125.599.744
> patched r2585 with no-merge-lines: like r2581
>
> I see no good reason why merge-lines is an option. I think we should 
> enable
> it and remove the parm, or at least, make merge-lines the default and 
> allow
> to switch it off with --no-merge-lines.
>
> Compiled binary is here:
> |http://files.mkgmap.org.uk/download/119/mkgmap.jar
>
> |Gerd
>
>
> > Date: Thu, 2 May 2013 20:01:32 +0200
> > From: wmgcnfg at web.de
> > To: mkgmap-dev at lists.mkgmap.org.uk
> > Subject: Re: [mkgmap-dev] merge-lines and routing
> >
> > > I'd like to move all calls to methods of RoadNetwork after the 
> filter chain,
> > > but that is not that simple. I think we have to move also all the 
> code reg.
> > > restrictions, maybe also the housenumber part.
> >
> > Hi Gerd,
> >
> > please don't mind about the housenumber part. I think it might be more
> > easy to redevelop it after your changes instead of keeping the 
> current code.
> >
> > WanMil
> > _______________________________________________
> > mkgmap-dev mailing list
> > mkgmap-dev at lists.mkgmap.org.uk
> > http://lists.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>
>
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