At zoom 19 inwards, everything but the roads turn brown. What is going on? How do I detect odd polygons like that?
Comment from tyr_asd on 11 September 2017 at 11:51
wow, that's odd.
The brown area has an apparently horizontal edge (at a latitude of approximately 40.13558) when you follow it from here eastwards (up until a longitude of ~27.47677), and a regular zig-zag structure in southwards direction. Towards the north-west it looks "randomly glitchy".
Comment from maxerickson on 11 September 2017 at 14:31
I think someone has dragged a node of a building a long distance. I think a place of worship given the color.
Sometimes the history view on osm.org is an easy way to locate the large bounding box of such a change.
Comment from ika-chan! on 11 September 2017 at 14:38
@maxerickson It doesn't look like the history page at osm.org is helpful at all. It shows every recent changeset in view, no matter how small it is.
Comment from maxerickson on 11 September 2017 at 14:50
If you zoom in close it ends up showing the large changeset bounding boxes. Unfortunately there are a lot of them in this area from POI editors.
Comment from tyr_asd on 11 September 2017 at 15:03
@maxerickson: If that was the case, could it also explain that this glitch is only visible on zoom 19 and not on any other zoom level?
Comment from maxerickson on 11 September 2017 at 15:14
I've fixed the dragged node in https://www.openstreetmap.org/changeset/51945038
The error was introduced in https://www.openstreetmap.org/changeset/51891607
Comment from tyr_asd on 11 September 2017 at 15:17
Aha! Here we probably have our bad boy: https://www.openstreetmap.org/way/512314784 (a building with one node in Vienna and the rest of its nodes in Zambia).
Comment from ika-chan! on 11 September 2017 at 15:24
Oh, not even JOSM or the most experienced mapper is immune to making mistakes.
Anyway, thanks guys.
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