[Tile-serving] [openstreetmap/osm2pgsql] Ideas for improved geometry processing (Issue #1663)

[Jochen Topf]

@mboeringa You are right, this issue is more about geometry processing in osm2pgsql and what @tordans wants to do is much more ambitious and currently not possible in the osm2pgsql framework. But I have been thinking about similar issues for other use cases I want to support somewhere down the line, for instance generalization of roads for small zoom levels. They have in common that they need some kind of network analysis of the road network that goes beyond simple geometry processing. That's definitely something we can't currently do in osm2pgsql, because osm2pgsql only looks at one object at a time, but it is something that we might be able to do with osm2pgsql and the database together, if we can find the right model of approaching this. It is definitely in scope for the [generalization project](https://osm2pgsql.org/generalization/), so I do want to hear about those use cases, although it would have fit better in a new discussion thread.

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