[mkgmap-dev] Splitting at country borders?

Sun Sep 20 22:58:49 BST 2009

>>
>>
> 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 guess Brett has different priorities and a list of more important  
work.
And it is not that simple. you need code to calculate intersection  
between ways and polygons. I bet osmosis doesn't have such code. this  
is not even a trivial, simple and fast thing to do. also you will need  
to use the same polygon across all tools to get the same border  
clipping. you need a slightly blown polygon since garmin tiles have a  
small overlap between tiles.

>>
>>
> 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.

no Geofabrik osm files are created with clipIncompleteEntities.  
impossible to merge them into a consistent format.
They offer data for free. take it or leave it ....

> 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.
>

but why split along the border?  if you for example load bavaria-nord,  
bavaria-south+austria-northwest, austria-southwest-italy-nord
is there any disadvantage? all borders are open in most of europe.why  
reintroduce them everywhere.

> So I would really appreciate it, if the presplitted maps from  
> geofabrik
> are clipped 'correctly' at the borders.
>
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