OpenStreetMap

Where have all the boundaries gone?

Posted by Amaroussi on 22 February 2014 in English (English)

Hi, nearly all boundaries in Athens, Greece, suddenly disappeared from the Mapnik map layer. It seems that the new method for rendering administrative boundaries seem to have forgotten relation-based boundaries.

What is the fate for the relation-based boundary standard as opposed to tag-based boundaries?

Location: Daktylios, Municipality of Athens, Central section of Athens, Athens Prefecture, 10554, Greece

Comment from EdLoach on 22 February 2014 at 09:54

I suspect if they are mapped according to the instructions in the wiki they still show. Around here all boundaries are also relation based, but the key point in the wiki is you also need the highest level admin_level (so lowest value) on the boundary ways.

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Comment from EdLoach on 22 February 2014 at 09:56

Ah, I see the change from "should" to "must" was recent.

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Comment from Circeus on 23 February 2014 at 03:17

The problem is that relation-based boundaries cannot be rendered in a way that guarantees all the ways of the same admin_level will actually look the same. Bot to mention that you end up with a whole bunch of ways in the database with no tags actually indicating what they are.

The result is that a significant portion of the world's boundaries render poorly because of bad tagging.

Boundary relationships are a good thing to have, but using them for rendering turns out to have been a less-then-ideal decision.

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Comment from Wynndale on 23 February 2014 at 18:45

The change has been withdrawn.

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