My typical processing steps are (ML>)Calib>Spk>TC>LindB and I see that this is also pretty much the order of steps you indicate in your tutorial. http://sentinel1.s3.amazonaws.com/docs/S1TBX%20SAR%20Basics%20Tutorial.pdf
The TerrainCorrection dialogue has the option of chosing “apply radiometric normalization” > “save as Sigma0”
What is the difference between a separate calibration and then TerrainCorrection, or only applying radiometric normalization in this TC dialogie? Without calibration before?
Any reason to chose one or the other?