public ChannelDigraphBuilder(OSMGraph osmgraph) {
   // Nodesbeziehungen erstellen
   ncp = new NodesConnectionProducer(osmgraph);
   ncp.produceNodesConnections();
   digraph = new ChannelDiGraph();
   this.osmways = osmgraph.getWays();
   digraph.setBbbottom(osmgraph.getBbbottom());
   digraph.setBbleft(osmgraph.getBbleft());
   digraph.setBbright(osmgraph.getBbright());
   digraph.setBbtop(osmgraph.getBbtop());
   this.osmgraph = osmgraph;
 }