I don't know much about AHS data, but it looks like you have a set of images that are in ENVI format, because they all seem to have an associated ENVI header file (with an .hdr filename extension). If they are truly already in ENVI format, then you can just select the file associated with the .hdr file from ENVI's File > Open tool. So, for example, just select the *.raw or *_sca file. I'm guessing they'll just open right up in ENVI. I don't know exactly what the different files that have ENVI headers contain, though. I would guess that the *_igm file probably contains lat/long or easting/northing values for each pixel in the image file(s). But I could be wrong. You may want to communicate with the data provider to find out more information about what data is in each of these image files. Or just open them all in ENVI and see if you can figure it out by exploring them. - Peg Exelis VIS