How about converting to UTM then using a zoom level specified as meters per pixel?
Here is what I did when printing from Mapnik: http://www.britishideas.com/2009/09/22/map-scales-and-printing-with-mapnik/ Andy Bernhard zwischenbrugger wrote: > Hi all > > Maybe that one is easy for someone out there, for me it's unsolvable. > > I have > minlat, minlon, maxlat, maxlon > That describes an area in WGS84 > > The area should be placed on the screen. > To place it on the screen, I need the centerlat,centerlng and the zoomlevel. > > To be shorter on that: > > Given: > wgs84: minlat, minlon, maxlat, maxlon > screen: width, height > > Needed: > lat,lng, center > --------- > > Hint: > > At first you maybe think > centerLat = (minlat + matlat)/2; > centerLng = (minlng + matlng)/2; > could be the solution. > > But that does not give the correct result. > The center must be the center in screen coordinates. > > > Bernhard > > _______________________________________________ > talk mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk > > > _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
