To-fix: Missing layer bridges

[samely]

Objective

Add missing layer tag to bridges in major or minor highways.

Tasks

The below tasks are updating everyday from Monday to Friday with the latest errors in OpenStreetMap

To-Fix issue:

• Major: http://osmlab.github.io/to-fix/#/task/missinglayerbridgesmajor
• Minor: http://osmlab.github.io/to-fix/#/task/missinglayerbridgesminor

Changeset comment

Adding missing layer tag to bridges using #to-fix  https://github.com/mapbox/mapping/issues/201

Coverage

All countries in this list: https://s3.amazonaws.com/mapbox/to-fix/mbtiles.txt

Tools for edition

• If using iD editor, work with To-Fix web
• If using JOSM, work with Josm-tofix-plugin

Instructions

• Check satellite imagery/Mapillary to make sure a bridge is visible:
  • If a bridge is visible add layer=1 tag. For complex intersections add appropriate layer= value based on the overlap order
  • If bridge clearly does not exist and there is no crossing ways, remove the bridge tag
• If editing in an actively mapped area, add a note instead of making a fix.
• If satellite imagery isn't clear click on not an error of to-fix

Common issues

Add layer=1 tag

How are we doing the error detection?

We are using osm-qa-tiles and osmlint selfIntersectingHighways

Who will work on these tasks?

Everybody is available to work on resolving these issues. However, @mapbox/data-team (Peru office) will work on everyday.

Question

Tag @planemad or @Rub21 for questions.

cc. @mapbox/team-data

[planemad]

@samely the way might also have an incorrect bridge tag. Please check updated instructions.

[dannykath]

Missing layer bridges minor issues from 07/11/2016 - 07/14/2016

Date	N° detected error	Total Fixed
Monday 11th, July	93026	5220
Tuesday 12th, July	104140	5701
Total	--	10921

[dannykath]

This is the Andy's comment:

@mapbox/team-data

[tankaru]

Hello Mapbox Data Team mappers,

Last week I had a discussion with one of your team members here.
https://www.openstreetmap.org/changeset/40603672

I want to ask you about your tagging standard.

When a waterway has "layer=-1" and a crossing bridge has no layer tag, do you add "layer=" to the bridge? And what about its value?
I think "layer=" is not required in this case, because the waterway already has layer tag. Even if "layer=*" is required, its value should be "layer=0".
(Note: "layer=-1" is valid and does not mean that object is underground. See http://wiki.openstreetmap.org/wiki/Key:layer)

And I have a favor to ask. If you don't have any rational basis, please do not modify existing tags.
I think existing tag has priority.

Thanks.

[bhousel]

Waterways do not need layer tags. Bridges, tunnels, etc do not need layer tags except in cases where multiple bridges or multiple tunnels cross over one another.

I hope we are not adding unnecessary layer tags, because these tags do nothing other than suppress valid warnings and make it more difficult for downstream consumers to use OSM.

[bhousel]

Btw it is pretty clear from the Japan GSI ortho imagery layer that these features are indeed bridges and not culverts. (A culvert is a pipe/tube that the water flows through).

[Andygol]

Hey @tankaru
there is quote from http://wiki.openstreetmap.org/wiki/Key:layer#Guidelines concerning waterways

Rivers and streams should not be tagged with layer -1 along long sections of their length, crossings should be tagged like other crossings with bridges, tunnels and layer. Waterways that are covered may be tagged with covered=yes and are generally rendered as if they flow underneath built features. Where a highway is at the same level as a waterway, you can add ford=*.

and http://wiki.openstreetmap.org/wiki/Key:layer#Things_to_avoid

Rivers and streams should not be tagged with layer -1 along their entire length or long sections as it makes harder to detect missing bridges for roads passing over waterways.

@bhousel

Although some map rendering and quality assurance services assume that bridges and tunnels are at layers +1 and -1 respectively, it is better to explicitly state the layer for all bridges and tunnels.

[bhousel]

@bhousel

Although some map rendering and quality assurance services assume that bridges and tunnels are at layers +1 and -1 respectively, it is better to explicitly state the layer for all bridges and tunnels.

We have never added explicit layer tags in iD.

[Andygol]

Validator in JOSM notify about intersection of features when anyone of them missed layer=* tag

[bhousel]

Validator in JOSM notify about intersection of features when anyone of them missed layer=* tag

That's so weird.. Neither Keepright nor Osmose complain as long as the bridge/tunnel tag is there.

[tankaru]

Thanks all for your comments.

Rivers and streams should not be tagged with layer -1 along their entire length or long sections

Yes. In Japan many rivers are tagged with "layer=-1" to entire way, but it's not a good manner. Layer tag should be added to limited way. I think it's not invalid but it's not good way. This is another problem.

it is pretty clear from the Japan GSI ortho imagery layer that these features are indeed bridges and not culverts

I agree. I just wanted to ask him/her why he/she tagged as culvert.

[piligab]

Missing layer bridges minor Progress issues from 08/29/2016 - 08/31/2016

Date	N° detected error	Total Fixed
Tuesday 30th, August	92443	253
Total	--	253

[piligab]

Missing layer bridges minor Progress issues from 09/05/2016 - 09/09/2016

Date	N° detected error	Total Fixed
Monday 05th, September	92,303	231
Tuesday 06th, September	92,078	218
Thursday 08th, September	90,797	431
Friday 09th, September	90,318	44
Total	--	924

[piligab]

Missing layer bridges minor Progress issues from 09/12/2016 - 09/16/2016

Date	N° detected error	Total Fixed
Monday 12th, September	90,407	246
Tuesday 13th, September	90,204	335
Wednesday 14th, September	89,880	319
Thursday 15th, September	89,589	336
Friday 16th, September	89,271	358
Total	--	1,594

[1ec5]

The JOSM warning is quite a pedantic one. As #201 (comment) points out, JOSM is the outlier here. Is there any evidence that data consumers are encountering problems caused by ways such as this bridge lacking layer tags, or is this just mapping for the validator? 😕

[piligab]

Missing layer bridges minor Progress issues from 09/19/2016 - 09/23/2016

Date	N° detected error	Total Fixed
Monday 12th, September	88,996	346
Tuesday 13th, September	88,665	351
Wednesday 14th, September	88,365	376
Thursday 15th, September	87,952	393
Friday 16th, September	100,019	324
Total	--	1,790

[dannykath]

Missing layer bridges major Progress issues from 09/19/2016 - 09/23/2016

Date	N° detected error	Total Fixed
Tuesday 20th, September	65,238	89
Wednesday 21th, September	65,142	102
Thursday 22th, September	65,062	124
Friday 23th, September	81,227	80
Total	--	395

[piligab]

Missing layer bridges minor Progress issues from 10/24/2016 - 10/28/2016

Date	N° detected error	Total Fixed
Tuesday 25th, October	98,774	331
Wednesday 26th, October	98,395	342
Thursday 27th, October	98,395	360
Friday 28th, October	97,704	240
Total	--	1,273

Missing layer bridges major Progress issues from 10/24/2016 - 10/28/2016

Date	N° detected error	Total Fixed
Tuesday 25th, October	81108	48
Wednesday 26th, October	81092	109
Thursday 27th, October	81092	69
Friday 28th, October	80985	110
Total	--	336

[dannykath]

Missing layer bridges major Progress issues from 10/31/2016 - 11/02/2016

Date	N° detected error	Total Fixed
Monday 31th, October	80923	103
Wednesday 02nd, November	80853	133
Total	--	236

[piligab]

Missing layer bridges minor Progress issues from 10/31/2016 - 11/04/2016

Date	N° detected error	Total Fixed
Monday 31th, October	--	251
Wednesday 02nd, November	80,854	259
Thursday 03rd, November	97,259	330
Friday 04th, November	80,720	241
Total	--	1,081

[piligab]

Missing layer bridges minor Progress issues from 11/07/2016 - 11/11/2016

Date	N° detected error	Total Fixed
Monday 07th, November	96545	304
Tuesday 08th, November	96320	318
Friday 11th, November	96047	285
Total	--	907

[piligab]

Missing layer bridges minor Progress issues from 11/14/2016 - 11/18/2016

Date	N° detected error	Total Fixed
Monday 14th, November	95861	359
Tuesday 15th, November	95176	364
Total	--	723