We are trying to create a comprehensive spectral libraries for both 'soil' and 'salt' based on 8 study areas and use those spectral libraries in Spectral Angle Mapper algorithm in order to map the salt pans existed in the entire world. To do so we need to use ASCII files which contain only band values of each individual pixel in each band without location information. I have read that the right format for importing spectral information is the one that has 2 columns of number of bands and mean values of ROIs. Below is an example of an ASCII file that can easily be set up in notepad. Since my preference is using the first type of output (values for all bands), is there any way by which I can use information – in my preferred format – as input to my algorithm?