Dear all, I have a problem in using FLAASH module. I would like to atmospherically correct a Landsat ETM+ image over an African volcano. So basically, I am only interested in this volcanic area. 1. Can I just use a subset (covering this volcano) of this image, or do I have to use the entire image for atmospheric correction? 2. If the subset of this image, what should I input for the "Scene Center Location" and "Ground Elevation"? I mean: center location/Elevation of this small subset or the entire image? (Elevation can make a big difference in the subset and the entire image over a volcanic/mountainous area). Thanks a lot. Long