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Missing structures like islands on map server tiles
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In case of the Greek island of Ios the island is not seen, only the streets of this island on the water surface. See:

I made a workaraound putting an area of this island as a map shape on the map to demonstrate the existence of this object in the OSM database.

Event Timeline

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptJun 12 2019, 8:21 AM

A similar failure was described in T215641.

Pikne added a subscriber: Pikne.EditedJul 10 2019, 3:49 PM

History of the relation of Ios (history viewer) has edit comments like "coastline fixes" and "repaired relations", which suggest that coastline of Ios has been broken on several occasions over the past months. So likely it was broken at the time when Wikimedia updated coastline. If I'm not mistaken coastline is updated less often than other map features, so it may take a while till it gets fixed. Unless someone tries to regenerate the area manually (approach mentioned in T159631).

It is well known, that OSM ways and areas could be defective. But they are shown on OpenStreetMap. Maybe more fault-tolerant functions are used at OSM as compared to these of Wikimedia. If a relation is an area maybe the shape can automatically be closed.

MSantos closed this task as Resolved.Jul 18 2019, 2:43 PM
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MSantos added a subscriber: MSantos.

It seems fixed, please reopen if needed.