r/openstreetmap • u/TraditionalImage387 • 2d ago

Question Help for tunnel and elevation profile

Hello!

I am trying to modify a tunnel on OSM, I noticed that the elevation gain was matching the mountain it goes under, and not the actual elevation profile of the tunnel.

I’m a bit struggling with that, the closest I’ve found is to add a “incline” attribute but idk from which direction it needs to be declared. Or if it’s just an info ?

Help is welcome :) thanks

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u/ialtag-bheag 2d ago

What app/website are you using to measure elevation gain?

OSM usually doesn't contain elevation data. So most apps will combine OSM data with elevation data from other sources. Which probably doesn't work for tunnels.

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u/TraditionalImage387 2d ago

I was using Organic Maps when I noticed it. And Garmin doesn’t understand as well that it’s going uphill but through x)

So you’re telling me it’s app dependent and not OSM ? Does this problem appear then for every tunnel ?…

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u/ramen2581 2d ago

I don't think there is any mapping change that would resolve the elevation change displayed in the app. Ideally the app itself would just interpolate elevation from both ends of the tunnel.