I have applied USGS Defined method for Gap filling for Landsat ETM+ data. After i have to apply T-cap... but when i check its spectral properties in ERDAS, it shows slight different values in Radiance Gain and Offset (a addition and subtraction of 0.4 from gain and offset for each of bands 1:, & 7)... My question is... should I use these new values or use the default values for T-cap generation? What is the reason for the change in the values?
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