formula to convert Lat and Long to x & Y in an Image

Question

HI

I have a Map Image that I got from OpenstreetMap(Osmarender Image ) .My question is

how to convert geographic coordinates to the co-ordinates of my picture (that is in pixels on X and Y on a picture). That is I receive geographic coordinates and it is necessary for me to draw this point on my picture.

Is there any API availabel in QT for processing this type of Map Problem

Answer 1

The Answer I was expecting can be found at Convert Lat/Longs to X/Y Co-ordinates

Thanks

Answer 2

Check the code for my mapsnap example, in particular MapModel::draw() function. If you know the zoom level of the OpenStreetMap rendered image and the tile offset, it is a matter of implementing the slippy map tile approach.

Answer 3

Check out the Proj4 library. You need to map the lat-longs to an XY coordinate system (e.g. UTM) and then map this to pixel space. Don't think Qt has anything like this.