[mkgmap-dev] patch: improve RoadMerger: allow to merge roads with reversed points

Wed May 5 14:39:49 BST 2021

I tried out my usual set of rules - could not notice any difference in
autorouting results. Also more complicated routes needing around 25 seconds
to calculate where exactly identical and took identical time to calculate.
Visual I did not notice a difference - but then did not look very hard to
find differences. Size decrease is modest compared to other changes...

On Wed, 5 May 2021 at 19:04, Felix Hartmann <extremecarver at gmail.com> wrote:

> Actually when I think about it - reversing the direction for waterways
> should be done anyhow - there is no waterway that flows in opposite
> direction. Cliff lines most likely the same.
> And for lines that are off center - that doesn't matter as long as all
> resulting lines are reversed. It would actually be better as otherwise at
> one point the right side jumps to the left and this could be prevented.
>
> Yes oneway roads (plus all copies created from it via continue) - those
> you cannot merge.
>
> On Wed, 5 May 2021 at 18:47, Felix Hartmann <extremecarver at gmail.com>
> wrote:
>
>> will that patch also work on the low resolution branch, or only against
>> trunk?
>>
>> On Wed, 5 May 2021 at 18:05, Gerd Petermann <
>> GPetermann_muenchen at hotmail.com> wrote:
>>
>>> Hi all,
>>>
>>> up to now RoadMerger doesn't merge (combine) two roads if the have
>>> different directions. This is OK for oneway roads but I see no need for
>>> this with other roads. The attached patch changes this. It has an influence
>>> on file size (safes a few KB in each tile) and very likely also on routing,
>>> hopefully to the better/faster.
>>> It also reduces zig-zagging in the low-res-opt branch.
>>>
>>> Strangely enough almost all was already implemented, so maybe WanMil
>>> (the original author) tried that before and found a reason not to do it.
>>> Will search the archives later...
>>>
>>> Gerd
>>> _______________________________________________
>>> mkgmap-dev mailing list
>>> mkgmap-dev at lists.mkgmap.org.uk
>>> https://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>>
>>
>>
>> --
>> Felix Hartman - Openmtbmap.org & VeloMap.org
>>
>>
>
> --
> Felix Hartman - Openmtbmap.org & VeloMap.org
>
>

-- 
Felix Hartman - Openmtbmap.org & VeloMap.org
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