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Opened 10 years ago

Closed 10 years ago

Last modified 5 years ago

#9598 closed defect (fixed)

Bogus "Areas share segment" warning by validator

Reported by: mkoniecz Owned by: team
Priority: normal Milestone: 14.02
Component: Core validator Version:
Keywords: Cc:

Description

Maybe there are cases where warning like this is useful but for now I encountered it only for buildings where it is correct tagging.

Example - entire old city of Kraków: http://www.openstreetmap.org/?mlat=50.061667&mlon=19.937222&zoom=15#map=16/50.0618/19.9371 (see https://en.wikipedia.org/wiki/File:Sukiennice_and_Main_Market_Square_Krakow_Poland.JPG and https://en.wikipedia.org/wiki/Main_Square,_Krak%C3%B3w)

Maybe after excluding building=* this rule will start reporting something useful.

Attachments (1)

9598.osm (4.4 KB ) - added by simon04 10 years ago.
A testcase

Download all attachments as: .zip

Change History (15)

comment:1 by Don-vip, 10 years ago

Milestone: 14.02

comment:2 by simon04, 10 years ago

If areas share a long segment, it might be better to introduce multipolygons. This is the idea of this informational message. Thus, I'd close this as invalid.

comment:3 by Don-vip, 10 years ago

Mmmm in that case we're talking about adjacent buildings that share a segment, yes, but converting all of them to multipolygons doesn't bring much. This is a normal way of tagging buildings in urban areas, I agree it should not raise any message, even informational.

Why do we have this check to begin with ?

comment:4 by simon04, 10 years ago

Right, we could exclude buildings. In my area, some large forest areas are split at artificial points to make the way polygon smaller in size. Instead, they share a long+complex segment (e.g. way/146342814 + way/146342845). This test identifies such cases.

comment:5 by simon04, 10 years ago

We also could change this test to generate a warning only if a way segment consisting of at least 4 nodes is shared.

comment:6 by Don-vip, 10 years ago

In France you can easily find buildings with small segments and more than 4 nodes. Think of buildings adjacent to churches for example, like here:
http://www.openstreetmap.org/#map=19/43.60096/1.43959

comment:7 by simon04, 10 years ago

In 6862/josm:

see #9598 - Validator: report "Overlapping ways" only if at least 3 segments are shared

comment:8 by simon04, 10 years ago

Do we want a separate handing for buildings?

in reply to:  8 comment:9 by Don-vip, 10 years ago

Replying to simon04:

Do we want a separate handing for buildings?

It is much better right now, but not still perfect in urban areas, there's still too much noise :) So yes I think we can ignore warnings when both areas are buildings.

comment:10 by Don-vip, 10 years ago

Or maybe just when one of them is a building. There's plenty of areas drawn alongside a building (parkings, gardens, etc.). We could also ignore barriers (see #9695).

comment:11 by simon04, 10 years ago

Resolution: fixed
Status: newclosed

In 6870/josm:

fix #9598 - Validator: do not report "Overlapping ways" for buildings

by simon04, 10 years ago

Attachment: 9598.osm added

A testcase

comment:12 by mkoniecz, 10 years ago

Resolution: fixed
Status: closedreopened

Is it possible to mention "it might be better to introduce multipolygons" in message? It is not obvious, I wanted to again report this bug because I had no idea what should be fixed.

I know that it would mean additional work for translators.

comment:13 by Don-vip, 10 years ago

Resolution: fixed
Status: reopenedclosed

Please don't reopen defects closed long ago to request something else. Please open a new enhancement for this, or simply update the online documentation for this warning.

comment:14 by Don-vip, 5 years ago

See #16933 for building:part

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