The logical centre and the geometrical centre aren't necessarily anywhere near each other --- for example, what is generally thought of as the "city centre" of Cambridge UK is some way west of the crossing point between the lines between the northmost and southmost, and westmost and eastmost, points of the outline of the city.
(I tried drawing those lines a few years ago, they crossed in Mill Road Cemetery, which makes it the "dead centre" of the city ;-) ) __John _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk