On Wed, 8 Jul 2009, Matt Amos wrote: > On Tue, Jul 7, 2009 at 10:26 PM, Stefan de Konink<ste...@konink.de> wrote: > > SteveC wrote: > >> inventing nodes, ways, segments (remember them?) > > > > You *did not* invent the spaghetti model, please give credit to the > > original inventor Stan Aronoff, in Geographic information systems: A > > management perspective (1989). > > actually, OSM doesn't use the spaghetti model. according to [1,2], > Aronoff's spaghetti model treats points as coordinates and lines as > lists of coordinates
Isn't this exactly how segments and ways are stored within OSM? An XML subtree referencing to points (thus lower diminensional objects)? While multipolygons are now stored as relation of two polygons? > - basically what the OGC's "simple features > architecture" [3] uses - and there's no explicit connectivity. OSM, on > the other hand, uses a topological model which comes from a graph > theory background, so really we should be crediting Leonhard Euler. Always good to credit him :) Stefan _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
