I don’t know your meaning of ‘exact’? The backscatter values after different steps in preprocessing procedure are not same.I think the following reference linking Radiometric & Geometric Correction Workflow would be helpful for you.
I don’t know your meaning of ‘exact’? The backscatter values after different steps in preprocessing procedure are not same.I think the following reference linking Radiometric & Geometric Correction Workflow would be helpful for you.