[mkgmap-dev] documentation of new option in branch

Mon Nov 4 15:45:36 GMT 2019

Thanks Gerd

On 04/11/2019 15:37, Gerd Petermann wrote:
> Hi Nick,
>
> as always the information is written with the logger (1). You have to activate logging at info level with
> uk.me.parabola.imgfmt.app.net.RoadNetwork.level=INFO
>
> (1) https://wiki.openstreetmap.org/wiki/Mkgmap/dev#Enabling_Debugging
>
> Using a negative value for NUM means that mkgmap doesn't calculate the islands at all, using
> 0 means that it only reports the islands. If you want to remove islands you can start with a value like
> 500. The default is 0.
>
> Gerd
>
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Pinns UK <osm at pinns.co.uk>
> Gesendet: Montag, 4. November 2019 16:29
> An: mkgmap-dev at lists.mkgmap.org.uk
> Betreff: Re: [mkgmap-dev] documentation of new option in branch
>
> Hi Gerd
>
> Thanks for all you work with regards routing islands!
>
> a) Is there a way of finding out how many .if any. routing islands were found given a certain length?
>
> b)  if NUM is negative is there any point in adding --check-routing-island-len=NUM
>
> Nick
>
>
>
> On 04/11/2019 13:58, Gerd Petermann wrote:
>
> Hi all,
>
> I think the work on the branch is almost done.
> Attached is a patch to add documentation for the new option.
> Please help to improve it:
>
> --check-routing-island-len=NUM
>          Routing islands are small road networks which are not connected to other
>          roads. Typical case is a footway that is not connected to the main road
>          network. These islands can cause problems if you try to calculate a route
>          and Garmin selects a point on the island as a start. It will fail to
>          calulate the route even if a major road is only a few steps away.
>          When calculating the NOD data mkgmap detects the islands. The option
>          --check-routing-island-len=NUM can be used to tell mkgmap that islands with
>          a total length below NUM meters should not be written to NOD. The effect is
>          that the corresponding roads are visible as usual but they are not
>          routable.
>          A negative value for NUM means that mkgmap skips the island check.
>
> ciao
> Gerd
>
>
>
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