I am using MTMF to match image spectra to library end member spectra. Hyperspectral Image data is in emissivity, ranging generally from 0.9 to 1. Forward MNF transformation on the image data yields an MNF image with ~10-20 high signal bands, with MNF values ranging from -10 to 10, but most MNF values for the first 20 bands range from -2 to +2. The MNF transformation is very good, it gives very good image discrimination of different materials. Laboratory spectra are in emissivity, ranging from ~0.7 to 1.0. This is the typical difference in intensity between laboratory and field spectra. Laboratory spectra should be sufficient to approximate the majority of the subpixel end members in the image Laboratory spectra are resampled to match the band configuration of the file input to the MNF transformation, then I have applied the forward MNF to spectra tool using the MNF stats file from the image transformation. The resulting MNF transformed spectra have values ranging from -50,000 to 50,000, most in the range of -5000 to +5000 (in the first 20 bands that should correspond with the high signal bands from the image data) Is this an expected transformed spectra result, when the input spectra have moderately more amplitude variation than the image spectra? My MTMF results do not yield results that match up well with known target (Subpixel) compositions, and I'm trying to determine if the error lies within the spectra transformation, or one of the other possible sources of error (poor laboratory end member choices, sub-pixel mixing assumptions, etc) Thanks