User Manual - pancroma

The plot shows all of the computed TOA reflectances versus band number. Nowyou must analyze the plot. Notice that the snow pack reflectances are uniformlylow for bands 5 and 7 and higher for the other bands. Note also that the otherbands do not show such uniformity as in bands 5 and 7. Our objective is todetermine the appropriate settings for the Spectral Analyzer TM (see followingsection) by inspecting this plot. I decided that I would try specifying that bands 5and 7 not exceed 0.10, while requiring that band1 be at least 0.20 and the rest ofthe bands at least 0.10.So the next step is to select ‘Close Graphics Windows and Reset’. Select ‘File’ |‘Open’ again and then re-open the six band files as before, i.e. bands 1,2,3,4,5and 7. Next select ‘Spectral Analysis’ | ‘Landsat Spectral Analyzer’ | ‘Six DNBands’. When the Spectral Criteria Form appears, enter the criteria from youranalysis of the Point Spectrum. In this example the separation is very easy asevery pixel reflectance in sample bands 1 through 4 are well above 0.1 whileevery reflectance in bands 5 and 7 is below 0.1. The settings are as shown inthe figure below.224