> ... As a rule of thumb i'd say something that can at least coarsely be > surveyed on the ground by a single mapper during a single day is > usually suitable to be mapped as a distinct named feature, provided it > is otherwise verifiable of course. ...
If everyone on Earth joined OSM and limited their mapping to their own local knowledge using that rule of thumb, our map would look like this :-) http://bit.ly/2IGkgoj Also, in regard to how 'sharp' the boundaries some of these very large features are, if a person has a passing knowledge of 'road cut' geology and mineralogy, they are incredibly distinct, especially in the American Southwest. They are also identifiable from DEM/DSM analysis, sometimes as easily as coloring the elevation. I somewhat agree that 'if' it was at all to go into OSM, there would be a special interest group that would ride herd on a specialized name space. These geologic regions are essentially 'historical' features, some on the order of a billion years :-) Michael
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