Geotag subway photos



I would like to take photos through the route of a subway, but I’m a bit confused how can I mark them as under-the-level. Is it possible?

Thanks in advance!



That is unfortunately not possible. Mapillary have no knowledge of elevation or height. You can always tag the images with a certain height, but Mapillary will not use it for anything, because the height in most consumer grade GPSes delivers terrible precision.

However, on OpenStreetMap metro lines are usually mapped with a layer that indicates what passes over and what passes under, so such a relation exists indirectly.