About exporting to ENVI format?

[ABraun]

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

This is part of the answer:

Error in GLCM calculation

Hello Andreas. Just a remark: there is no difference between AWS S2 data and SciHub data, except the packing/grouping of files. From an “original” S2 product, the SNAP S2 reader knows how to convert DN to reflectance (of type float), whilst if you open just a jp2 file (a single band), the SNAP JP2 reader doesn’t know how to do that and you only have DN.

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.

DC to reflectance

Hi I think you can use a simple bandmath like “B2/1000” and save as floating point data. Please have a look at the algorithm document “https://sentinel.esa.int/web/sentinel/technical-guides/sentinel-2-msi/level-1c/algorithm”. Reflectance, often between 0 and 1, is converted into integer values, in order to preserve the dynamic range of the data by applying a fixed coefficient (1000 by default). Regards Ralf

DC to reflectance

Be aware that the quantization of reflectance values in L1C product will change in future products. Reflectances will be coded in the [0, 10000] range instead of the actual [0 1000] that you can observe in current products on scihub. A metadata value gives you this information in : Level-1C_User_Product/General_Info/Product_Image_Characteristics/QUANTIFICATION_VALUE