OpenStreetMap

Odd brown area

Posted by ika-chan! on 11 September 2017 in English (English)

Source: https://www.openstreetmap.org/#map=19/38.42912/22.45257

At zoom 19 inwards, everything but the roads turn brown. What is going on? How do I detect odd polygons like that?

Location: Itea Ring Road, Κοινότητα Κίρρας, Kirra, Δήμος Δελφών, Regional Unit of Phocis, Region of Central Greece, Decentralized Administration of Thessaly - Central Greece, 33200, Greece

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".

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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.

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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.

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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.

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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?

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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).

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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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