Qt - how to map ,map coordinates to image pixel in an scene

I have created an Scene in Qt where i took the an image from open street map[.png] and placed it into the Sce开发者_如何学JAVAne . I have also exported its coordinates in an another file .My Question is how do I map my image pixel with the map coordinates. basically i want to plot the roads in the map into my image .Thank you

Does the download from openstreetmap give you any coords and scale for the image tile?

If not then you have to find some objects in the scene and get their world coords from somewhere

here is the answer I was looking for Convert Lat/Longs to X/Y Co-ordinates