Invalid pixel values in SCL

Dear all,

i noticed it, that some of the S2L2A SCL files contains invalid pixel values, like 12, 13 or 14. I remeber, that the valid range is 0 to 11, but I checked the official documentations of the sen2cor 280, and haven’t got any new information about the pixel values of the SCL file. The valid range is still 0 to 11.

Here you can find two S2A filenames with the invald SCL range (from the same datatake):

  • S2A_MSIL2A_20190925T095031_N0213_R079_T33UYP_20190925T141948 -> 3-13
  • S2A_MSIL2A_20190925T095031_N0213_R079_T34UCU_20190925T141948 -> 0-13

Do you have any information, or suggestion regarding to this problem? Sorry if it’s a well-kown problem, and it’s have been discussed before in another topic, i haven’t found related topic.

Thanks in advance,
András

Hello @andreijj
It’s not clear to me what you are describing. I’ve looked at the L2A Tile for 33UYP - it’s mostly cloud, I see… and it has the 12 Classification Masks (0 - 11) as described here:
https://earth.esa.int/web/sentinel/technical-guides/sentinel-2-msi/level-2a/algorithm
Could you maybe please provide more information? Or even better; a picture? :slight_smile:

Thanks in advance

Cheers

Jan

S2MPC Operations Manager

Dear Jan,

thank you for you reply! When i drag and drop the SCL file into QGIS, on the layer tree i see that, the layer values are in the 0 to 13 interval (top left image). When I check the layer properties, the Statistics_maximum value is 13 as well (top middle image). When i check the statistics in SNAP, i got 0 to 11 values for the SCL band (bottom image). If i change the stlye of the layer in QGIS from default to palette with unique values, i get classes between 0 to 11 (top right image). If i calculate a raster, with “values are greater than 11” condition, i got exclusively 0 values. So, it seems there are no invalid pixel values at all, only something wrong with the QGIS layer view and layer properties view, and that was a bit missleading.

András

1 Like

Hello @andreijj
Thanks.

Yes; it looks like a QGIS issue.My SCL layer in QGIS goes from 3 - 13. But I manually changed it in the Layer Properties > Symbology popup :slight_smile:

Cheers

Jan