How to calibrate, geocode ERS-2 and Envisat SAR Images using gpt

i am beginner to snap and also to batch processing is there any kind tutorial for beginers please let me know and also if you have code for this or script file share with me

open the graph processing tool to create a work flow like this

This can be saved as an xml file: graph-file.xml (4.9 KB)

You can then open the batch processing tool to apply this file to as many files as you want.

You can also do this from the command line with the follwing expression:
gpt graph-file.xml -S=infile -T=outfile

Further information:
SNAP Graph Builder
Exercise: Graph Processing Tool (GPT)
STEP forum: Graph Builder
Radiometric & Geometric Correction Workflow

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thanks for the replay