Would anyone happen to know of an open archive of polygons defining the major cities of the world?
What I am looking for are series of lat/long points which define polygons within which the cities lie. The polygons don't have to be terribly accurate, just reasonably approximate. All the open archives I've come across so far give the lat/long co-ordinates of the city centres, rather than polygons which approximate the boundaries of the cities. I would be very grateful if anyone could direct me to such an archive or archives (even if you just know of one for your own country or continent, I am interested) Thanks in advance, Will
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