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#1 2021-09-03 07:33:27

stephankn
Moderator
Registered: 2010-05-04
Posts: 625

Warning: another influx of (bad) edits coming, this time by TomTom

Hello community,

see https://maproulette.org/browse/projects/46322
and the announcement by TomTom:
https://lists.openstreetmap.org/piperma … 00075.html

I replied on the list and posted a veto after a quick check and missing roads reported are only at most highway=track or highway=service. Without local knowledge remote mappers are likely to mess up highway classification more.

I am directing in the reply to this post for further discussion.

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#2 2021-09-03 07:53:55

stephankn
Moderator
Registered: 2010-05-04
Posts: 625

Re: Warning: another influx of (bad) edits coming, this time by TomTom

this was my response to the mailing list:
https://lists.openstreetmap.org/piperma … 00076.html

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#3 2021-09-05 15:02:56

cmoffroad
Member
Registered: 2021-07-15
Posts: 32

Re: Warning: another influx of (bad) edits coming, this time by TomTom

Thanks for the update Stephan.
I had a look at 10 samples in areas I am familiar with, most of them either do not exist or are impossible to guess from satellite imagery.

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#4 2021-09-09 13:47:57

CourtneyCW
New Member
Registered: 2021-09-09
Posts: 1

Re: Warning: another influx of (bad) edits coming, this time by TomTom

Stephan, thank you for your thoughtful reply and for starting this thread in the preferred channel. We are glad to know of this forum as an addition to the OSM Mailing lists since our policy is to always wait for community feedback before beginning our projects. We have removed the Thailand Missing Roads challenge for now and will await your further questions and inputs before we begin work. --CourtneyCW

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#5 2021-09-10 04:35:34

kucai
Moderator
Registered: 2011-11-08
Posts: 327

Re: Warning: another influx of (bad) edits coming, this time by TomTom

Just to jump on chance here, please exclude Malaysia also if there's any plan for it. God knows how much time was spent on correcting those edits smile

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#6 2021-10-04 13:30:33

MarjanVan
Member
Registered: 2021-09-09
Posts: 5

Re: Warning: another influx of (bad) edits coming, this time by TomTom

Hi everyone,


I am Marjan from TomTom. We are aware that in recent years, you’ve had some bad experiences with errors introduced by organised editing in Thailand (specifically road alignment and categorization issues). We therefore understand that challenges like our Missing Roads project are met with some skepticism. Our goal is to further improve the map in cooperation with the local community. Therefore, to meet these concerns, here is some additional information:

Our map editing team consists of highly experienced OSM editors, and all edits are quality checked. You can see the team here: https://wiki.openstreetmap.org/wiki/Org … iting_Team.
We have examined the Thailand Tagging Guidelines (https://wiki.openstreetmap.org/wiki/Tal … sification) and reviewed some of the relevant discussions on this forum.
Are there any other resources you would like us to review before we commence the project?

Please share any additional concerns. We are looking forward to your feedback and to collaborating with you to improve the map.


Kind regards,
Marjan

Last edited by MarjanVan (2021-10-05 08:08:38)

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#7 2021-10-05 05:09:26

cmoffroad
Member
Registered: 2021-07-15
Posts: 32

Re: Warning: another influx of (bad) edits coming, this time by TomTom

MarjanVan wrote:

I am Marjan from TomTom. We are aware that in recent years, you’ve had some bad experiences with errors introduced by organised editing in Thailand (specifically road alignment and categorization issues). We therefore understand that challenges like our Missing Roads project are met with some skepticism.

Hi Marjan, thanks for reaching out.

First of all, I would like to ask: where do these suggestions of missing roads come from? Is it based on TomTom routing data or some imagery-based algorithm?

Like @stephankn mentioned, our main concern is that in most cases highway classifications can't be simply guessed without a ground survey or local knowledge. Adding road geometries is easy and can be done by anyone including local mappers.

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#8 2021-10-05 14:58:07

MarjanVan
Member
Registered: 2021-09-09
Posts: 5

Re: Warning: another influx of (bad) edits coming, this time by TomTom

cmoffroad wrote:

Hi Marjan, thanks for reaching out.

First of all, I would like to ask: where do these suggestions of missing roads come from? Is it based on TomTom routing data or some imagery-based algorithm?

Like @stephankn mentioned, our main concern is that in most cases highway classifications can't be simply guessed without a ground survey or local knowledge. Adding road geometries is easy and can be done by anyone including local mappers.

Hi cmoffroad, thanks for sharing your questions.

The missing road suggestions are the result of an internal analysis and comparison of TomTom’s own map to OSM.

For the highway classifications, we follow some best practices including:

  • referring our editors to the country highway tagging guidelines,

  • confirming with various sources like imagery, Strava, ground-level imagery and GPS traces,

  • reviewing the local road network nearby to make sure that the classification fits into the existing road network.

Let me know if there’s anything else you’d like me to clarify.

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#9 2021-10-12 14:57:42

MarjanVan
Member
Registered: 2021-09-09
Posts: 5

Re: Warning: another influx of (bad) edits coming, this time by TomTom

MarjanVan wrote:
cmoffroad wrote:

Hi Marjan, thanks for reaching out.

First of all, I would like to ask: where do these suggestions of missing roads come from? Is it based on TomTom routing data or some imagery-based algorithm?

Like @stephankn mentioned, our main concern is that in most cases highway classifications can't be simply guessed without a ground survey or local knowledge. Adding road geometries is easy and can be done by anyone including local mappers.

Hi cmoffroad, thanks for sharing your questions.

The missing road suggestions are the result of an internal analysis and comparison of TomTom’s own map to OSM.

For the highway classifications, we follow some best practices including:

  • referring our editors to the country highway tagging guidelines,

  • confirming with various sources like imagery, Strava, ground-level imagery and GPS traces,

  • reviewing the local road network nearby to make sure that the classification fits into the existing road network.

Let me know if there’s anything else you’d like me to clarify.

I hope the additional feedback above answers your questions and concerns. If no one has any objections, could our team move forward with the project? If yes, we would be checking in regularly to see if you have additional advice or questions.

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#10 2021-10-16 20:54:28

stephankn
Moderator
Registered: 2010-05-04
Posts: 625

Re: Warning: another influx of (bad) edits coming, this time by TomTom

Hello MarjanVan,

I appreciate that you answered back. But you just gave some very unspecific answers, which do not address the concerns we raised.

First: You created a MapRoulette challenge. This is open to anyone. And based on experience very often they are picked up by people not familiar with the local situation at all and just wanting to support OSM.
So your point of pointing YOUR editors to something does not help. You have no control about the edits happening via MapRoulette.

Your project does not give any hint for mappers on how to do proper highway tagging.
Referring to some general best practices does not help at all here.

What are your planned quality control steps of the contributions? Also considering that these edits happen on live data. So any correction would happen after damage was already done.

Please re-read our initial posts. We checked roads marked by your algorithm as missing.
Youhave a nearly 100% rate of "missing" roads impossible to tag correctly by remote mappers unfamiliar with the situation on the ground.

Why is it so important for you to have roads added which are at most highway=track or maybe service? They play only a minor role in the road network at all. Is it for you to satisfy some metric created by an algorithm pointing out to "unmapped" roads?

We could certainly live with a tiny percentage of mis-classified roads. But this is aiming at a failure rate of maybe 80% which is unacceptable, giving an optimistic guess that you might be able to deduct the classification correctly from context on some highways.

Stephan

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