Dear All, I have simple problem with the routine ENVI_Setup_Head. I have been trying to georeference one image (hdf format) from another (hdf format). I wrote a script in IDL, it works well with ENVI files but with HDF files I need to specify a keyword POINTER_INFO and I do not know how it should look like (please give me some examples). Please explain me something about the anonymus structure of this keyword (Where I can find data set index and information about DIMS in HDF file??). Thanks for HELP, Jan,