I am working with a Sentinel 1 SLC IW image (VV+VH) and trying to calibrate the data in the SNAP toolbox. However, it keeps returning the error "cannot construct data buffer"

Does anyone have any idea why this might be happening?

  • This error is likely caused by insufficient amounts of RAM. What are the details of the machine you are running SNAP on?
    – Kersten
    Apr 25, 2016 at 9:29
  • Thanks for your answer. My computer has 16GB RAM and is a 64-bit operating system. It is built for handling GIS and remote sensing data so this is why I was surprised.
    – Simba06
    Apr 25, 2016 at 9:34
  • Can you please include your SNAP configuration? e.g. how many RAM is used by the VM, how many paralell threads, etc.
    – Kersten
    Apr 25, 2016 at 10:13

1 Answer 1


As mentioned the error is due to RAM but not the system RAM, the available RAM for SNAP. you can change the configuration in the snappy.ini file located in the snappy folder. and increase available RAM Change the line

java_max_mem: 4G

to e.g.
java_max_mem: 6G
A recommended value is 70%-80% of the available RAM in your system.

see: http://forum.step.esa.int/t/increase-snappy-memory-beginner/6269

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