Hey, thanks to participating in a recent hotosm building mapping task (I’m just an iD editor user), I came to notice a complex landuse relation that seems to trip up OSM’s default renderer somehow.
I have already left a note on location, but is there something more suitable I could do?
At this point, I’m curious enough to even go through a “how to troubleshoot broken geometries” in JOSM, if someone pointed me at a sufficiently detailed guide.
Funny, I even managed to add this missing line segment as a 72th outer member to the giant multipolygon. Now I’ll just have to wait for a re-render. If successful, I might have a new hobby. I have already spotted multiple other white patches…
Areas view of OSMInspector (tools.geofabrlk.de) identifies broken closed ways, multipolygons and boundary relations, which can be opened in relevant editors. The analysis is global and runs twice a day, if I remember correctly.
You should break this multipolygon up into multiple simpler closed ways with straight boundaries connecting to the holes. It’s much easier to update and maintain later.
I’ve drawn my suggested simplification cuts in purple here. You may have to use JOSM’s Alt-X to actually do this efficiently.
