The answer is - it depends. If you know the image projection (Mercator?) and the precise scale of the image - it may be enough to have just one point (think - a tile from Google maps). To georeference an image in a general case (assuming the image has simple linear proportions) requires at least 2 (really at least 3) points (otherwise the system of equations won't be solvable) and more would be better. Once you solve it - you can get coordinates of any other points in the image.
Aashish Chaudhary wrote: > Hi, > > I have an image with center known in lat / lon. I need to calculate > the image corners in lat / lon. I have some idea but I am wondering if > someone can share his / her knowledge. > > Also is there a utility in gdal that would do this for me? > > Any help is appreciated. > > Thanks, > > ------------------------------------------------------------------------ > > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
