On Wed, Apr 16, 2008 at 2:28 PM, Martijn van Exel <[EMAIL PROTECTED]> wrote:
> Hi all, > > I've been warming up as many of my colleagues to OSM as possible, and > sometimes this comes back to me. Being GIS people, they have GIS > requirements, and OSM was not devised specifically with GIS > requirements in mind. That said, yesterday a colleague approached me > asking why OSM data doesn't comply to the Simple Feature > specification[1] (allowing easy import in for example SQL Server 2008, > which he was actually attempting). The only exceptions apparently > being that self-intersecting polygons are allowed in OSM. He found a > couple hundred in the Netherlands' OSM data. > > Is this something that is being considered? I guess it would be easy > to check for self-intersection upon adding / changing a polygon. Is > there a specific reason why self-intersecting geometries would be > explicitly allowed? > > Take care, > > [1] http://en.wikipedia.org/wiki/Simple_Features > -- > martijn van exel -+- [EMAIL PROTECTED] -+- http://www.schaaltreinen.nl/ > I doubt they were "explicitly allowed". Heck, there isn't even a "polygon" type (although I hear there used to be...) More likely they're just not explicitly denied. And without an explicit polygon type, they can't be filtered/denied without determining if it's a polygon or not, which would involve evaluating the way tags against some (changeable) rules which govern whether the particular way should be treated as a polygon. Karl
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