a newbie question: how to get latitude and longitude of city London
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Are you asking how it could be done or how it is done? It could be defined as the coordinates of the center of gravity of the polygon(s) representing the city boundaries. It is however done in the manner similar to the one described by trønderen, i.e picking an arbitrary place of a certain dubious relevance. You can see interesting examples running Google Earth and searching for different cities. It shows both the city limits polygon and the point picked up as center. In particular, for London, the center is the statue just south of Trafalgar Square, while for Paris and New York it is the city hall. For Madrid it is the "Puerta del Sol" plaza, that happens to be the origin for road distances in Spain. An interesting case is also the city where I live, Montreal: due to many mergers and de-mergers of various municipalities, the city boundary has absolutely nothing in common with a polygon. Conclusion: it's a mess :)
Mircea
great info for the algorithm:rose:
diligent hands rule....
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recently I am studying on book like this: Raphael's. I wonder how to decide a city's latitude and longitude because a city is a large area, not a spot.
diligent hands rule....
