[GraphHopper] RFC: Improve tower/pillar node marking

[Jan Soelter]

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Hi Andreas,

> For that, I want to create two new classes/interfaces: a NodeMap, that
> encapsulates the source (OSM)->internal ID mapping, and a NodeTypeMap
> that uses the NodeMap to get the node type. The latter can probably be
> thrown away after preprocessing, I did not think that through till the
> end.
>
> What do you think of that approach? Is it a good idea? Or am I missing
> a part of the bigger picture that makes this unfeasible?
>

Indeed I think this is a very good idea. Basically to separate in the
import process "what" is provided, and "how" it is provided.

Cheers,
Jan

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