Pixel average export fall in circular polygon mask

[marpet]

Yes, Ana is right. The StatisticsOp is probably the right tool for you.
In this thread you can get some guidance:

A StatisticsOp graph

This post shall help to explain how to set up a StatisticsOp graph and what is the meaning of its parameters. An example graph is attached. The StatisticsOp will, unlike other SNAP operators, not create an output product but instead write statistics to either a .csv-file or an ESRI shapefile. Note that this graph works with SNAP 6.0.3. If you work with earlier versions, some of the parameters are not available. First, the StatisticsOp offers two ways to specify source products: Either by settin…