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[mkgmap-dev] Routing

From Gerd Petermann gpetermann_muenchen at hotmail.com on Tue Jan 14 15:11:36 GMT 2014

Hi Steve,

the new NodDisplay tool reports a lot of errors for files
that were created with latest mkgmap .
I see lost sync messages as well as things like
" error INVALID node, low=0, tabpos=83f, max=30bf"

Similar problems with my Garmin img file.


> Date: Tue, 14 Jan 2014 14:23:51 +0000
> From: steve at parabola.me.uk
> To: mkgmap-dev at lists.mkgmap.org.uk
> Subject: [mkgmap-dev] Routing
> Hi
> I've been looking into routing and I have updated NodDisplay
> so that it mostly works on any file.
> I've not discovered much that wasn't known before, apart from
> a compact way of storing directions that is probably suitable
> for short roads. There is a destination road-class field in
> the node flags that we do not seem to set, so we should fix that.
> I am in the process of updating the nod.txt file with everything I've
> learned so far.
> There are also two new programs.
> 1. test.check.NodCheck reads in a NOD file and cross checks
>     various things. So it can tell you if the angle in NOD is similar
>     to the actual angles between two nodes.  Files give lots of errors,
>     but it doesn't mean that they are wrong, just things to look into.
> 2. test.svg.Main Converts the routing graph to an SVG file that
>     can be displayed in inkscape (and perhaps other SVG viewers).
>     The idea is to be able to visualise what is going on. Only a
>     portion of the file is processed, since the output is very
>     large.
> They are only of use if you want to look into the routing code. The
> output will make no sense at all if you are not familiar with it,
> and possibly even if you are ;)
> ..Steve
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> mkgmap-dev at lists.mkgmap.org.uk
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