An inconsistency in the SWIR dark frames in Earth datatakes creates a small effect in EnMAP SWIR data which may be best seen at low radiance levels (e.g., for very low Sun zenith angles and night scenes). A dedicated correction of the SWIR dark signal was therefore developed based on selected Earth night scenes and shown to fix the issue (see Fig. 1). A significant part of the SWIR across-track striping as well as the random noise at these low signals is significantly reduced by the correction.
The developed SWIR correction was implemented at L1B level and is active in EnMAP processing since 18 Nov 2024. VNIR data is not affected by this update.
Users interested in benefiting from this SWIR improvement in EnMAP scenes processed before the mentioned date can simply re-order their scenes in EOWEB.