Hi there, So I have mosaiced several landsat images together (about 15 path/rows). I have ran into trouble with correctly mosaicing bands 1-5 and 7. The first band is good, but the other bands have significant gaps in-between each image, with increasing gap size towards band 7. I have tried to avoid this problem by mosiacing each individual band, and then layer stacking them and editing the header file afterwards. When I layer stack each mosaiced band, I run into an error about half way: envi_stack_layers_doit: An error has occurred during processing Error: "WRITEU: Error encountered after writing to file. Unit: 101 File: path/to/my/layer_file_name the result may be invalid My first guess would be that layering the large, mosaiced bands might be to much memory for envi to handle. I bet that I can mosaic all of the path/rows for each band all in one swoop, so perhaps that's my ticket instead of my "brute-force" method. Anyways, any thoughts, comments, or words of advice? Thanks