Hi Puneeth, If you have your ENVI header and you know the pixel Easting, pixel Northing, x-pixel size, and y-pixel size, you can do a quick calculation to find the values at the four corners with the pixel size and number of pixels. Or, you can use the ConvertPixelToMap coordinates to do all of that using ENVI + IDL. Here is a link to the documentation for that task: http://www.exelisvis.com/docs/ENVICon...

Hi Mr.Zack, I do not have an ENVI licence,so I'm trying with IDL to headlessly store the four geographic corners from a geotiff image. Is it possible to give me a snippet on how I can achieve it :) ..Thanks for your reply. Regards, Puneeth

In that case, it may be easiest to use the MAP_PROJ_INVERSE function, which can convert from cartesian X and Y to lat/lon for a map projection that you set up with MAP_PROJ_INIT. This will likely be easiest and all you need to do is take the number of x and y pixels times their corresponding scaleto find the extent in Cartesian X and Y. Then you can use MAP_PROJ_INVERSE to convert from cartesian X and Y to the Lat Lon range of the Map

Thanks Mr.Zack, seems do-able