Hi,
I am new with graph and batch processing. Please see the graph I build. I would like to use this graph to process 30 tiles of sentinel 3 level 1 RBT.
Thanks in advance!
I don not think loops are allowed. You should be able to simplify the graph by making the bandmath-calculations more complex.
thank you @mengdahl
yes loop is not working because newly build bands are not able to call within a single graph for next bandmath 
however, if i want to run this simple graph with a single command by gpt to run 30 tiles, what would be the command? 
The batch-processing functionality under Tools will let you to run the same graph on a number of input products.
There is a guide which explains how to do bulk processing on the command line.
https://senbox.atlassian.net/wiki/spaces/SNAP/pages/70503475/Bulk+Processing+with+GPT
Probably this can help you.
@marpet thanks for your recommendation. It helped me to make a batch file and XML file. But still, I am facing some problems. No idea what’s going wrong. Please see the attached figures. Any help will be really appreciable. 
