Support multipolygons whenever areas are expected

[marioxcc]

Some big areas like big railway yards are mapped as multipolygons. Currently https://openrailwaymap.app/ does not display those.

[wolfy1339]

That's odd, as I'm pretty sure multipolygons are supported for yards, as I implemented support for that.

[marioxcc]

Here is an example where it does not work: Relation is https://www.openstreetmap.org/relation/2100854. ORM-vector shows no yard here.

[wolfy1339]

It currently only renders when it's tagged with landuse=railway

It could be a good idea to add industrial=depot to the list of allowed tags

[marioxcc]

This yard has landuse=railway and it does not render.

[hiddewie]

Stations (which include yards) are currently not imported at all in the form of relations, only nodes and ways.

Nodes:

OpenRailwayMap-vector/import/openrailwaymap.lua

Line 1167 in 9924416

local station_feature, station_state, name = railway_feature_and_state(tags, railway_station_values)

Ways:

OpenRailwayMap-vector/import/openrailwaymap.lua

Line 1463 in 9924416

local station_feature, station_state, name = railway_feature_and_state(tags, railway_station_values)

Yes it makes sense to import multipolygon relations as well for yards.

The reason the yard outlines sometimes show for multipolygons, is that a yard point which is contained inside a landuse = railway, is then reinterpreted as yard area. This is because many yards worldwide are tagged as points, inside a railway landuse. But tagging the yard itself as multipolygon also makes sense.