There is noticeable (but not very high) number of surface=granite / surface=marble and other similar tagging type of stone into surface tag.
------------------------------------------------------------------------------- There was some discussion on https://community.openstreetmap.org/t/type-of-stone-in-surface-surface-granite-and-similar/9424 ------------------------------------------------------------------------------- Surface=granite blocks distinguishing between surface=paving_stones surface=sett surface=unhewn_cobblestone surface=rock etc surface=granite may be any of following: Exposed raw rock (surface=rock / surface=raw_rock) https://wiki.openstreetmap.org/wiki/File:Half_Dome_ropes_4.jpg Natural stone machined into a flat surface (surface=paving_stones) https://commons.wikimedia.org/wiki/File:Pretty_natural_stone_used_for_paving.jpg Flattened stone, but still not entirely flat and not covering entire surface (surface=sett) https://commons.wikimedia.org/wiki/File:Granite_Setts.jpg Raw cobblestone of natural, uncut, rounded stones. (surface=unhewn_cobblestone) https://commons.wikimedia.org/wiki/File:Ancient_road_surface.jpg Stones or plates individually arranged in a row, allowing to walk on, surrounded by an unpaved medium such as grass or water (surface=stepping_stones) https://commons.wikimedia.org/wiki/File:River_Rothay_stepping_stones_120508w.jpg https://wiki.openstreetmap.org/wiki/File:Stepping_stones_-_geograph.org.uk_-_832601.jpg surface=gravel and surface=pebblestone and maybe some other would be valid. (note: specific photos above may be not necessarily depict granite, but `surface=granite` could also take such forms) (if you have a better photo then improving https://wiki.openstreetmap.org/wiki/Tag:surface%3Dgranite would be highly welcome) ------------------------------------------------------------------------------- So instead of surface=granite using material=granite would be preferable. For example instead of: highway=pedestrian surface=granite following tagging would be better: highway=pedestrian material=granite This makes space for tagging surface=sett or surface=unhewn_cobblestone or surface=paving_stones etc I think that it would be much better to tag and such migration can be done with an automatic edits. So I am proposing following replacements: surface = granite → material = granite surface = granit → material = granite surface = marble → material = marble surface = sandstone → material = sandstone surface = laterite → material = laterite surface = limestone → material = limestone surface = limerock → material = limerock surface = chalk → material = chalk surface = basalt → material = basalt Edits will be not made where there is already material / paving_stones:material tag with a mismatching info. Edits will be made where such surface tags are present now or will appear in future. There are also surface=steel, surface=aluminium and surface=iron but these are trickier and not proposed to be edited here (I guess that leaving surface=metal would be useful and surface=iron should only be changed to surface=metal as it is really unlikely to be correct) Why it is useful? It helps newbies to avoid becoming confused. It protects against such values becoming established. Without drudgery that would be required from the manual cleanup. It also makes easier to add missing surface= values Why automatic edit? I have a massive queue (in thousands and tens of thousands) of automatically detectable issues which are not reported by mainstream validators, require fixes and fix requires review or complete manual cleanup. There is no point in manual drudgery here, with values obviously fixable. This values here do NOT require manual overview. If this cases will turn out to be an useful signal of invalid editing than I will remain reviewing nearby areas where bot edited. Yes, bot edit WILL cause objects to be edited. Nevertheless, as result map data quality will improve.
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