Indoor mapping online meeting

Hello everyone!

Last weekend we had a workshop around indoor mapping in Frankfurt (Arbeitstreffen Indoor OSM 2022 - OpenStreetMap Wiki). While very productive we didn’t even get close to covering all topics, so we want to follow up on this with a couple of online meetings. This would hopefully also help with expanding collaboration beyond the initially rather German-centric workshop.

The proposed topic for the first session would be questions around the level tag, such as:

  • What is a level, how to deal with intermediate/fractional levels.
  • How to deal with level tags beyond a single self-contained building (e.g. for large train stations).
  • Inconsistencies between level and repeat_on.

The proposed time frame for this would be around the third week in November, with the exact day and time to determined by a poll (times in CET): Umfrage - Indoor mapping online meeting - nuudel


Again in Frankfurt/Main?

Thank you for your continued work on SIT and making the meeting notes available.

A few thoughts on them

  • The discussion should not be in German only. The proposed tagging scheme should be applicable to building conventions other than those found in Germany, too. Involving people from across the globe prevents a tagging scheme that relies on regional conventions.

  • Walls
    ** Wall polygons should be avoided if possible. They are justified for characteristic walls as in the cathedral example, though.
    ** The indoor mapping should avoid introducing an excessive number of OSM nodes since this makes editing hard especially for users without awareness of filtering in editors (casual mappers and new users).
    ** It’s not trivial but walls can be generated by data consumers/renderers if needed. I’ve described this in more detail at Augustus Kling's Diary | Floor plans, wall generation and labels | OpenStreetMap where an interactive example is also linked.

  • Corridors
    ** Instead of indoor=corridor it’s preferable to have indoor=room/area + room=corridor since a corridor is only a special case of predominant room/area use.

  • Doors
    ** I’d challenge if one really wants to model doors in detail. Perhaps its better to stick with door=yes + level + optional width.
    ** To give details about doors one could draw walkways connected to the door nodes and specify attributes on the walkway. I’m thinking about single directional use (oneways), time restrictions (opening hours) and if the user needs to be able to push/pull to open a door in order to make use of the walkway (may affect routing for disabled people).
    ** Door or walkway details should be an abstraction that allows deriving meaning for various use cases. The aim should not be to describe every detail that can be seen in reality. For example one could map door materials but I don’t see how this could be a useful thing to do.
    ** I’ve attempted to detect where outside is in the example linked above and visualize building entrances with green triangles this way. This detection considers the presence of rooms instead of building polygons because the shape of the building may be different for each floor.
    ** I see no advantage of using indoor=door over door=yes. The former could be removed to simplify SIT.

The next step will be to meet online on a videoconferencing platform.

Independently from these planned online meetings, I hope some of us will also be able to meet face to face at the 2023 FOSSGIS conference in Berlin where I’ve submitted a discussion session (“BoF”) on the topic. But besides that, we have made no plans for another physical meeting so far.

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Thank you for your thoughts! I think this is pretty close to what we discussed at the meeting. Agree that it would be good to allow more people to join the discussion, and I hope that continuing the conversation online will help us achieve that.

On the topics that were discussed in Frankfurt, we plan to also bring them up one-by-one in separate discussions/threads. We’ll likely use this forum and would appreciate your input there as well.

Based on the poll it looks like Monday, November 14th 13:00-17:00 CET is the best option. The meeting will happen in BigBlueButton: OSM Indoor Meeting

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I’ll be there, too. I hope a lot of you will join us! :slight_smile:

There’s now an OSMCal event as well for extra visibility or if you want to add it to your calendar.

Let’s try this again, the turnout to the previous attempt was rather limited (@Tordanik and I), despite considerable larger interest in previous workshops/discussions and the poll.

Same topic, same procedure, please see the following poll for options mid-February: Umfrage - OSM indoor mapping online meeting - nuudel

I’d suggest we pick a date by Feb 3, so please fill in the poll before then.

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Just filled in the poll, thank you for setting it up! I’m looking forward to the meeting and hope a lot of people join! :smiley:

Consider me very interested! I filled out the poll :grin:

Interested too ! Filled out the poll though not so much available during that week :crossed_fingers:

Excellent! You showed a great overview of the challenges around the level tag in railway stations at the workshop in November, that would be a good starting point for the discussion :slight_smile:

Any news on this ? The poll points towards Feb. 14th or 15th…

I’d suggest we pick February 14th 17-20 CET then, that’s the only slot without a no vote. One of the maybe votes there is from me, I can move another meeting to make this work.

We’ll meet in the same BigBlueButton room again: OSM Indoor Meeting - see you next Tuesday 17:00 CET!

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We had pretty good discussions last Tuesday … then I had a few days off and now realise I didn’t keep the notes :woozy_face: Could you please share the notes or a link to a pad or something ?

Notes are on the wiki, thanks to @VolkerKrause for taking them:

Indoor Tagging Meeting 2023-02-14

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Hello everyone,

we’d like to try to get this going again, but given how much time has passed
with a slightly different format. Rather than a long session with a focus on
one specific subject, we’d suggest to have a shorter and more general meetup which
hopefully allows more people to attend as well.


  • connect people interested in and/or working on indoor topics
  • exchange on current developments and/or open questions/challenges
  • find ways how we can better collaborate on those topics, as progress on big
    open issues (like concepts for dealing with complex floor level topology beyond
    a single building) has been rather slow.

Here’s a poll for possible times in September: Umfrage - OSM indoor mapping online meetup - nuudel

I’d suggest we pick a time by Aug 25.


Hi, unfortunatly we had to drop this topic for our room management and I lack of time to follow all the details in my spare time (even if I try to stay uptodate :wink:

Oops I missed the poll (was on hols) and am not available on September 14th. I had a mapping challenge to discuss with you, I’ll do my best to write a note to describe it…

Signed naomap (Antoine Riche) - looks like I got confused with my accounts on the community forum :-\