[mkgmap-dev] Splitting at country borders?

Sun Sep 20 22:21:24 BST 2009

Johann Gail wrote:
>> neither splitter or osmosis insert new points. but it is required to  
>> have boundary nodes in mkgmap. splitter would need to calculate  
>> crossing points with the boundary or a provided split polygon with all  
>> ways and insert the boundary points.
>>   
>>     
> This is my opinion too. Whatever tool does the splitting into countries, 
> it has to create new nodes at the intersection of the roads and the 
> state borders.
>   
>> you can do the presplit but routing can't work then across boundaries.
>> osmosis has different modes
>> - clip ways at the boundary -> no routing across tiles due to missing  
>> nodes
>>   
>>     
> As I'he written before, I don't know the internals of osmosis. But if I 
> the ways are clipped at a border, then it should be possible to create a 
> new node at the intersection and mark the node as a border node.
> Is there a developper of osmosis reading this list?
>   
I'm not an osmosiv dev, but there is already (in theory because it's not 
working, at least for me) - the option completeway=yes and 
completerelations=yes which should be sufficient (both by default if not 
given resort to no).
>>>> Then it would be possilbe to download europe from geofabrik, split it
>>>> into countries and then crate maps from it.
>>>> These maps would be interroutable. It would be also need less  
>>>> computing
>>>> power/memory for doing this compared of
>>>> processing the whole europe map
>>>>       
>>>>         
>>> I would expect the interstate routing to work. Precondition is  
>>> obviously
>>> that the presplitted tiles don't miss any segments at the border and  
>>> the
>>> border nodes have exactly the same coordinates.
>>>
>>>     
>>>       
>> still don't understand why this is useful. If you want multiple  
>> countries and route across countries and tiles why split it more than  
>> necessary and try to assemble again?
>>
>>   
>>     
> As some other users have written, then it would be possible to download 
> the regions of interest from geofabrik and compile them with splitter 
> and mkgmap and have a routable map.
> Then its not neccessary to download whole europe, when I want only 
> bavaria and austria. I could furthermore load the precompiled maps of 
> countires onto my etrex, just as I need them.
>
> So I would really appreciate it, if the presplitted maps from geofabrik 
> are clipped 'correctly' at the borders.
>   
I think many many people would like this.
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>   

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