Hi, Thanks for your reply. I think I have to gather more information here about the projection of the image. Currently the meta data tells me only these 3 things:
1. Origin lat lon 2. Size of the image 3. Spacing All I need is 4 corner points in lat / lon. Currently I am doing something like this (as an approximation) long = centerLong + pixel_x_relative_to_origin Thanks On Sat, Jun 5, 2010 at 4:20 PM, ogr user <[email protected]> wrote: > 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
