[GraphHopper] Heights in Graphhopper

[Robert Schmid]

Hey Peter,

right now i am trying to get the height attributes to work.
What I've done so far:
- I've added a height member to the Node class
- I've added a height_diff member to the Edge class

So here is my first question:
nodeOsmIdToIndexMap.put(node.id(), pillarId + 3);
Why is it pillarId + 3?

And another question:
What's the SEGMENT_SIZE for? Why is it 1<<20?

It should work with my changes, but the flushing step takes a very long 
time when creating the graph.
I think it has something to do with the segmentsize.


Thanks for your help,

Robert
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