Hi Peter, It's been a while since I hand-rolled a world file. If you can, install a recent version of QGis, as it has a truly excellent georeferencer. You click on control points on the bitmap, indicate the coordinates they represent in the real world, then set the system off transforming the map.
> The map file is called map.jpg and I have created a world file called > map.wld I'd call that map.jgw, which is the convention for JPEG world files. (TIFF has tfw, PNG pgw, and so on.) > 100.0 > 0.0 > 0.0 > -100.0 > 103.5 > 1.5 Ooh, that can't be right. Lines 1 and 4 are units/pixel; if you're using geographic coordinates, that's 100°/pixel. This wants to be a small number. > Can you give me reasonably correct values for my world file? Lines 1 and 4 might want to be 0.01 and -0.01 respectively for 100 pixels/degree. > Do I need to create a projection file It helps, but these are even harder to produce by hand than world files. I think that QGis can produce them in the georeferencer. Stewart _______________________________________________ Talk-ca mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-ca
