About exporting to ENVI format?

The values in the second picture are the reflectance (0-1) * 10.000

This is part of the answer:

This means that the data is basically stored as an integer (0-5000 or something) but in SNAP it is interpreted as reflectance (float values between 0-1) using the available metadata.

If you want to export it you need the corresponding quantification value (1.000 in the past, 10.000 now). So dividing your data by 10.000 should be the solution.

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