Hi all, up to now I've implemented a) the algo to calculate the convex hull (using the QuickHull algo) for a set of coordinates b) an algo to identify elements with addr:place tag which are probably referencing the same place. I use a combination of addr:place,addr:city,addr:postcode and the mkgmap:admin_levels8 to 10 This makes it less likely that a wrongly tagged object is blowing up the area for a hamlet, but I still see hamlets with a dense cluster of nodes and a few ones rather far away which might be copy+paste errors in the OSM data. c) an algo to the find roads without mkgmap:street which intersect with one or more of the computed convex hulls. This is all work in progress and not yet usable. Open problems: 1) The convex hulls may be overlapping. I assume I have to subtract the overlaps (from all areas) 2) Some OSM ways connect different hamlets. I think I have to split them somewhere outside of any of the convex hulls. 3) The convex hull might be (nearly) a straight line if only a few houses along the same side of the road are tagged with addr:place. I guess I have to make sure that I'll find at least one road that is close to them. 4) I am not sure if I should name all unnamed routable ways with the name of the hamlet. This could include tracks and steps etc. . I think I should check a tag like mkgmap:ignore-for-housenumbers=1 to exclude roads from this algo. Any better ideas ? Ciao, Gerd