With this mail I would like to open a general discussion, whether it makes sense to add detailed 3D data into the current OSM db.
Living in a historic city with lots of tourists (many of them mappers apparently), and lots of famous monuments, I am observing for years now, that more and more detailed 3D objects get mapped. While at first this seemed to be an interesting (and maybe logical) development of some advanced mappers, to further push the limits of mapping, more and more doubts have grown in the meantime whether this kind of data is sustainable. Particularly because the raised complexity leads to many errors, where people recreate already existing objects or add localized name tags (or other tags) to (building:)parts that are mainly there for geometric representation in 3d, but are not the objects that actually represent the feature (i.e. those that have most of the tags). Subsequently other mappers find these objects (with some tags) and add more, and after a while it can become plain chaos, until someone with a lot of time dedicates herself to clean the mess up. And honestly, I can understand this happening, these objects are really complex and after something has been "3D-fied" it becomes at least time consuming, if not completely confusing to make any simple edit (like adding a new tag), because you have to search the "main object" and understand where to put the tag. I believe there is something conceptually wrong with adding those 3D-monsters into the common db and require from everybody to understand them, without proper support or hierarchy on an API- or editor-level. (a side-issue is that many monuments like columns, obelisks and similar are modelled as "building:parts", where there clearly is nothing that is a building, but rather a massive stone) Some examples (load them in your editor to understand what I am talking about): https://www.openstreetmap.org/#map=19/41.90224/12.45784 https://www.openstreetmap.org/#map=19/41.90297/12.46658 https://www.openstreetmap.org/#map=19/41.89591/12.48466 (the Trajan's column, a simple column consisting in osm of 9 concentric objects! Find the right one, if all of them get their name rendered at the same spot in the editor) https://www.openstreetmap.org/#map=19/41.89854/12.47695 (the Pantheon, countless times there pop up duplicates as nodes) What are your experiences? Cheers, Martin
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