[OSM-talk-be] bridge or tunnel?

Tue May 28 07:55:25 UTC 2019

I don't think that, what was first, is always relevant. Your cycleway
'tunnel' is a bridge. A tunnel has to go in depth or under a lot of
other things (not a simple crossing). 

A bridge is in general less thick then the height of the passage. 

Or the height of a tunnel is less than half the level difference. 

Regards, 

Gerard 

Tim Couwelier schreef op 2019-05-28 09:28:

> I'll agree with everyone else on the given selection here. 
> 
> As for how I try to decide: 
> Ideally, you'd have the history of 'what came first'. Whichever level this one is at goes as the 'baselevel'. 
> Either a new road / railway / .. goes:
> OVER it, making that a bridge 
> UNDER it, making it a tunnel 
> AT THE ORIGINAL LEVEL, making the existing road/path a bridge or tunnel based on how that got adjusted.
> 
> That makes this a railway-bridge: https://www.google.be/maps/@50.9501557,3.1304248,3a,60y,255.18h,91.97t/data=!3m6!1e1!3m4!1sV8dGdG1hKMYxX3JldKdTSA!2e0!7i13312!8i6656 
> But this, just a bit further, and at the same level as the road shown in the previous example, a tunnel for cyclists: https://www.google.be/maps/@50.9516067,3.1299799,3a,48.9y,281.94h,86.62t/data=!3m6!1e1!3m4!1sPooi08Nvz-feFB6XzaibnQ!2e0!7i13312!8i6656
> 
> Hope that makes sense, I personally feel it matches with how people tend to label things. 
> 
> Op di 28 mei 2019 om 00:04 schreef Pieter Vander Vennet <pietervdvn at gmail.com>: 
> 
> Cool collection of bridges (except #2). I too think that if its not dug, it's not a tunnel.
> 
> I have another cool example, not from belgium though: https://www.google.be/maps/@45.5067122,6.6792676,3a,75y,267.08h,77.06t/data=!3m6!1e1!3m4!1stJwtCeCLHlLxMPnVB_ZYdw!2e0!7i13312!8i6656?hl=nl 
> 
> This view is on a bridge (over a small valley) which acts as ski piste (in winter), and continues through a building (which has a ski piste on top). 
> 
> Met vriendelijke groeten,
> Pieter Vander Vennet 
> 
> Op ma 27 mei 2019 om 22:44 schreef GeDeOn . <gedeon2012 at outlook.fr>: 
> 
> Hi Stijn and all  
> 
> In my opinion, a tunnel is something that was dug, in a hill or in mountain, under a river, ... 
> 
> Otherwise I would think of a viaduct. 
> 
> In that regard only your case #2 is a tunnel. 
> 
> Just my 2 cents... 
> 
> Pierre 
> 
> Envoyé depuis mon smartphone Samsung Galaxy. 
> 
> -------- Message d'origine -------- 
> De : Stijn Rombauts via Talk-be <talk-be at openstreetmap.org> 
> Date : 27/05/19 20:57 (GMT+01:00) 
> À : OpenStreetMap Belgium <talk-be at openstreetmap.org> 
> Cc : Stijn Rombauts <stijnrombauts at yahoo.com> 
> Objet : [OSM-talk-be] bridge or tunnel? 
> 
> Hi, 
> 
> 1. This is a bridge: no doubt. 
> https://www.google.be/maps/@50.9628551,5.0810297,3a,75y,328.21h,89.12t/data=!3m6!1e1!3m4!1sXz43z9vWyUiOpCVTschIUQ!2e0!7i13312!8i6656?hl=nl 
> 
> 2. This is a tunnel: sure enough. 
> https://www.google.be/maps/@50.6138142,5.5973887,3a,75y,97.64h,84.03t/data=!3m6!1e1!3m4!1sRvKwojNbhvMdSBWG3zViLw!2e0!7i13312!8i6656?hl=nl 
> 
> 3. This looks like a tunnel, no? Or is the fact that the railway is on an embankment enough reason to make it a bridge? 
> https://www.google.be/maps/@50.5508531,4.7216376,3a,89.9y,51.8h,87.45t/data=!3m6!1e1!3m4!1s4GoklQWnN5bW6ugdo1grmg!2e0!7i13312!8i6656?hl=nl 
> 
> 4. This one looks more like a bridge: 
> https://www.google.be/maps/@50.5923923,4.6668939,3a,75y,57.67h,80.29t/data=!3m6!1e1!3m4!1s4y-C9gvI9ZsUk9jcNQX4eA!2e0!7i13312!8i6656?hl=nl 
> 
> 5. And this? Brunnel or tidge? 
> https://www.google.be/maps/@50.5214486,4.8868137,3a,75y,27.85h,81t/data=!3m6!1e1!3m4!1sx0n9EuFTEx27S4sCQ--GPg!2e0!7i13312!8i6656?hl=nl 
> 
> 6. And if it gets shorter? 
> https://www.google.be/maps/@50.5317414,4.9485687,3a,75y,39.18h,91.35t/data=!3m6!1e1!3m4!1sdTd6puiPIvGKsLBzeCzB6Q!2e0!7i13312!8i6656?hl=nl 
> 
> 7. And this? 
> https://www.google.be/maps/@50.8660892,4.3648486,3a,75y,333.02h,85.73t/data=!3m6!1e1!3m4!1swvUHgLYhl8R5IXGVJ2QWiQ!2e0!7i13312!8i6656?hl=nl 
> 
> 8. A bit more complicated: not only a railway, but also the platforms on a bridge? Or above a tunnel? 
> https://www.google.be/maps/@50.8101922,4.3991964,3a,75y,63.96h,87.57t/data=!3m6!1e1!3m4!1s2ioHz72P7Ju0aTcMLalGKg!2e0!7i13312!8i6656?hl=nl 
> 
> 9. And if you turn around: 
> https://www.google.be/maps/@50.8101922,4.3991964,3a,75y,258.54h,101.02t/data=!3m6!1e1!3m4!1s2ioHz72P7Ju0aTcMLalGKg!2e0!7i13312!8i6656?hl=nl 
> 
> I am curious about your opinion... 
> But of course, what those things are, is not really the question. How should they be mapped? That's the question. 
> 
> Regards, 
> 
> StijnRR 
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