Hi,
do you know about the vector map (vmap) data set [1]?
I know it about 20 years old and not really accurate but there are
"metropolitan area" polygons in this data set, which may fit your needs.
You can get the data in shapefile format form here [2] in 1:1,000,000
and not for the whole world but in 1:500,000 from here [3].
Download the 7z archived file(s) and extract it, the shape file you are
looking for is the "pop-built-up-area-p.shp".
Cheers,
Christian
[1] http://en.wikipedia.org/wiki/Vector_Map
[2] http://gis-lab.info/qa/vmap0-eng.html
[3] http://gis-lab.info/qa/vmap1-eng.html
William J. Spat schrieb:
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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Christian Willmes
AG GIS & Fernerkundung | GIS & RS Group
Geographisches Institut | Institute of Geography
Universität zu Köln | University of Cologne
http://www.geographie.uni-koeln.de/gis
Tel.: +49 (0)221 470 6234
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