Hello group, I am trying to discriminate a material using its spectra. I have collected the spectra in the field using a spectroradiometer with 16 bands. But I am having some probelms correlating these to a MSS  image with 4 bands before doing a Spectral Angle Mapper classification on the image. It gives me an error message that the bands are not compartible. So how can I resample the spectral bands of the data from the spectroradiometer from 16 bands to 4 bands, as to make my classification? Thanks for responding