Hi Matthew, > Is there some extra math I'm supposed to employ to display lon/lat > coordinates beyond just scaling them to the dimensions of the display?
You do have to account for the earth's curvature. If I understand correctly, you're scaling each degree of latitude and longitude to a fixed distance on the page, right? That will compress coordinates at the extreme edges, but it's still a valid map. You can also map each linear metre on the ground to a set distance on the page. This turns gridded cities properly rectilinear, but only works over short distances. The earth's curvature starts to distort lengths near the edges. Here's a short article that gives a quick overview of the OSM tile projection: http://alastaira.wordpress.com/2011/01/23/the-google-maps-bing-maps-spherical-mercator-projection/ cheers, Stewart _______________________________________________ newbies mailing list [email protected] http://lists.openstreetmap.org/listinfo/newbies
