L3A use of MAJA masks

Hello SEN4CAP,

I would like to have some precisions about the use of masks generated by MAJA.

I found in the technical document (Biophysical Indicators) that “non-valid pixels (snow/cloud/cloud shadow) should be masked and replaced with no data”. However, looking at the masks generated by MAJA (labo.ops-mip), I notice that different cloud types can be detected.
So I was wondering if you could clarify how to convert non-valid pixels into no data (possibly the bits of the CLM and MG2 masks)?
Actually, I would like to work with an area in Northern Europe, often hidden by clouds. So I thought that a too strict use of masks would not be appropriate…

Many thanks for your help.

Best Regards


During L3B (and all high level processors) only the MG2 mask (more specifically bit CM2 for clouds) is used.

2nd bit (CM2) : cloud_mask_all_cloud, result of a “logical OR” for all the cloud masks

In this moment, there is no possibility to remove some cloud types from masking as we do not use the CLM mask.

Best regards,