Hi, First, let us not confuse speleology and tourism. OSM is the most interesting for touristic caves to walk in 2D. Speleologists have their own 3D maps showing where to crawl. I worked in a touristic cave when I was a student and I can tell you that the paths look very much like man-made, especially the main entrance that nobody would call anything else than a tunnel. I wasn't, of course, thinking of using a (let alone) GPS to find my way through a cave, but I would love this dialog with tourists in a cave: - What's that map? - OpenStreetMap. Why? Doesn't it work with Google?
So, my first conclusion is: why do we insist on sticking the concept to either cave or tunnel instead of both? On 2014-08-14 15:47, Janko Mihelić wrote : > The reason "renderers don't render it" is invalid because of one of > the oldest rules in OSM: don't tag for the renderer. There goes that nude saying again. Tagging for the renderer is *making a tagging mistake* to obtain some rendering. There would be no tagging mistakes if we decided that "tunnel" applies to some caves. Now, regarding the difficulty to render cave=*, it's a well known fact that many people complain to tag in vain because what they tag doesn't show on the map (e.g. a mini-golf vs tennis pitch), because they're told to open a rendering ticket which replies that only official tags are supported, and because they open a vote for an official tag and nobody signs. The second conclusion is that it's really difficult to obtain rare rendering, and especially like this: On 2014-08-14 14:00, SomeoneElse wrote : > On 14/08/2014 12:22, André Pirard wrote: >> >> I know I still have to learn that OSM is fuzzy, but using "cave=yes" >> for paths would first need a definition of it in the "highway=*" page. > > No, it really wouldn't(1). > > Cheers, > > Andy > > (1) http://wiki.openstreetmap.org/wiki/Any_tags_you_like - and yes, > that page does discuss "Documenting tags not in Map Features" and > "What not to map" too. And as nobody would like to show a blank map to tourists in a cave, they will tag for the renderer. The nude sentence should be "don't have mappers to be forced to tag for the renderer" instead. André.
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