I’d like to take the difference between the same band in two different products using the Snap GUI, but can’t figure out what band-maths expression to use. Based on the advice in this thread and the documentation on the BandMaths operator I’ve tried all of
In the GUI you should be able to just click on the first band (of the first product) then type “-” (or whatever mathematical operator you need) and then click on the second band (of the second product), so that proper names will appear in the expression editor.
The latest version is version 6. Plus some updates. So you are far behind. I suggest that you update. http://step.esa.int/main/download/
However, in general, the product selection should also work in version 3.
The products need to have the same size (width, height).