Comparison of atmospheric correction methods
I have noticed that dos methods for atmospheric corrections are in the section of radiometric correction
i.*.toaron GRASS GIS. Does that means that dark object subtraction (DOS) is a method for doing radiometric and atmospheric corrections at once? Input images for that method have to be in DN format I would suspect. I want to compare the results with 6s algorithm.
The DOS methods are for atmospheric correction only, not radiometric correction.
The i.*.toar modules allow you to combine in one step radiometric correction with some additional DOS atmospheric correction method. The input to the i.*.toar modules is the original DN values.
The default to i.*.toar is "uncorrected", so normally you would use i.*.toar to get a radiometric corrected image, then run that thru i.atcor (which implements 6S) to get your atmospheric correction.