Olav Kvittem schrieb: > Hi, > > I wonder how I compute the coordinates of the corners of the images > received from the web export function > for an osmarender image. I specify geodetic center position(degrees), > zoom level and image size and get at nice map image. > The projection is of cource Mercator and I can linearly map mercator > coordinates onto the image. > But how do I know the coordinates of the corners of the returned image ? > > The url I use is : > http://server.tah.openstreetmap.org/MapOf/index.php?long=10.17456&lat=56.01566&z=6&w=500&h=592&format=png' > > > > The tile-size for each level is 256x256 so given the zoom-level I could > compute the pixel density from the > world map size in mercator projection. > That works for east direction which is linear, but for the northern > direction the projection is nonlinear and > I am not sure if the geodetic center that I specify is at the center of > the returned image or not.
have a look at the debugHelper.pl in [EMAIL PROTECTED] it will give you the latlon center of the tile bbox and the latlon of the center of the tile. -- Dirk-Lüder "Deelkar" Kreie Bremen - 53.0952°N 8.8652°E
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