2011/1/26 Sami Dalouche <[email protected]>: he geonames project (http://www.geonames.org/) provides over 7 million POI, and 2 million of them are cities.
2 million can IMHO only refer to all settlements, not just to cities. There is around 7 billion people living on earth, ~ half of them in cities. If you divide 3,5 billion people by 2 million, you get an average of 1750 people per city. Not quite much ;-) (or they have lots of multiple entries). > So, more specifically, here are my questions : > 1/ how many cities are present in OSM ? this is easy to answer: http://taginfo.openstreetmap.de/keys/place#values 492 155 village 397 919 hamlet 57 083 town 44 450 suburb 18 942 city > 2/ how many of these cities are also associated to polygons that delimit > them ? are you asking about the city or about it's administrative boundary? http://taginfo.openstreetmap.de/keys/boundary#values > 3/ Are countries and administrative divisions also explicited in OSM ? (e.g. > USA, California, Orange county, ..) you can do this with relations > 4/ Are there polygons for these administrative divisions and countries ? you can get them from the relations (if the relations are there and are clean). Have a look at type=boundary and type=multipolygon Cheers, Martin _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
