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Just in time! I thought it was only me, but now it seems global! The layer staking utility of Erdas seems buggy in some sense. It cannot identify which layer to place where in the img, whereas ENVI places them quite accordingly. Couples of months ago this 'bug' ate my head after doing a layer staking job on GeoEye 1. The layers staked alphabetically (BGIR) and did 'wonderful job' on ndvi and so on. What a crap! Integraph should work on it. @ samrae, the ndvi should be higher in dense veg and slope down toward non-veg, IF the pre-processing is done well. Have a doubt? try the ndvi option of arcgis 10 to quick check the outputs. Still struggling? try the Model Maker of any of two to build a custom model. Try these on the raw layer TIFFs from scratch, you can't miss it! :wink: