[mkgmap-dev] documentation of new option in branch

Mon Nov 4 15:29:23 GMT 2019

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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