http://forum.geonames.org/gforum/posts/list/4.page JForum - http://www.jforum.net post mentions polygons used by the webservice. Are the polygons also used to update which city belongs to which timezone? I've spent some time doing a 'scrub' on the Olson timezones to find the zones that are "the same" (from now on), and I've plotted the corresponding populated areas on a world map. It's a total hack just to help me visualize this stuff: http://blog.time2call.net/ImageMap2/ Cheers, Russ ]]> http://forum.geonames.org/gforum/posts/list/1596.page#6629 http://forum.geonames.org/gforum/posts/list/1596.page#6629 GMT http://forum.geonames.org/gforum/posts/list/1596.page#6630 http://forum.geonames.org/gforum/posts/list/1596.page#6630 GMT http://forum.geonames.org/gforum/posts/list/1596.page#6631 http://forum.geonames.org/gforum/posts/list/1596.page#6631 GMT