Hello all, since my last entry, I find some interesting applications and functions in ENVI. But now I faced some problems. The fact is, that I have some Landsat images (Landsat 5 TM and Landsat 7 ETM+) with different values for the same landcover. For my classification (change detection) one of my ways is the decision tree, but I do not want to change the thresholds for classification in every image - which makes the classification in my perspective useless. Now I'm looking for a function which normalize the values, so that I'm able to use the same thresholds in the decision tree for all images. Is that possible and if, how? I would already like to thank you for your support.