[mkgmap-dev] Splitting at country borders?From Johann Gail johann.gail at gmx.de on Sun Sep 20 22:13:01 BST 2009
> 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? >>> 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.
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