[Tile-serving] [osm2pgsql] Invalid multipolygon or osm2pgsql issue? (#185)

[mboeringa]

> The original version of the MP would have been an old-style, resulting in tags being moved to the MP's polygon from it's constituent ways, so the ways wouldn't of had polygons themselves. When the relation was changed it wouldn't of triggered reprocessing of the ways, so they never got polygons recreated.

I am trying hard to digest what you are saying here. I do understand the basic structure of multipolygons, and that many "older" multipolygons don't have tagging information on them, just their outer ways, although this is no longer recommended practice.

You are saying that osm2pgsql actually moves tags from outer ways to their corresponding multipolygon relation when building a rendering database, and that this in turn might explain the loss of some of the inner ways tagging information, resulting in no polygons being created? This is all entirely new information for me, so please confirm if I understand this right.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/185#issuecomment-57083759
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