Since I said it is wrong, I think I should provide the way to solve it : - We can use the latitude of the center of the view to compute the scale, though this will be inaccurate when we are in zooms 0 to 5 approx. Let L be the latitude of the center of the view. - In zoom z each parallel is covered by 2^z tiles. - The length in meters of the paralel is 40,000,000 * cos(L) - So the width/height of each tile can be assumed to be: 40,000,000 * cos(L) / 2^z In the case of Linkoping: L = 58.4 z = 18 tile w/h = 80 m. Cheers, Lucas
________________________________ De: Juan Lucas Dominguez Rubio Enviado el: jue 17/04/2008 1:37 Para: [email protected] Asunto: Wrong scale bar :( Reusing Lars Aronsson's message, we can see that the new scale bar is wrong. The buildings in this screenshot should be 32 x 11 m (attached example.jpg) Cheers, Lucas ------------- [...] I've never cared too much about that scale, but now I know that these apartment buildings along Syrengatan are 11 x 32 metres and not 22 x 64 metres as JOSM would lead you to believe, http://www.openstreetmap.org/?lat=58.407&lon=15.600&zoom=17&layers=0BFT [...] -- Lars Aronsson (lars at aronsson.se) Aronsson Datateknik - http://aronsson.se <http://aronsson.se/>
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