I have used the collocation tool. The master product is a 10 bands S2 image and the slave product a vv or a vh band from S1 corrected.
But when I open the resulting product on qgis I see that the value of the S1 band is 1.0 everywhere on the picture.
Do you know what to do?
could it be that you are looking at the collocation flag - 1 means that the pixel was covered by both products.
There should be the other bands as well. Please have a look at this tutorial:
Synergetic use of S1 (SAR) and S2 (optical) data and use of analysis tools (starting from page 15)