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benji-glitsos-ga committed Sep 26, 2024
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Learn more about the [DEA Summary Product Grid](/guides/reference/collection_3_summary_grid/).


## 26 Sep 2024: `s2cloudless` ARD reprocessing underway
## 26 Sep 2024: 's2cloudless' ARD reprocessing underway

We have begun reprocessing the older Sentinel-2 ARD data that was [impacted by a bug](#may-2024-misclassification-issue-with-sentinel-2-s2cloudless-cloud-masking-from-2022) in the s2cloudless
cloud masking layer.

The addition of an offset factor in ESA's Sentinel-2 L1C Processing Baseline 4.0.0 [on January 25
2022](https://sentiwiki.copernicus.eu/web/s2-processing) led to the generation of incorrect `s2cloudless` cloud
classifications in our systems. This resulted in an over classification of cloud, particularly over bare and
classifications in our systems. This resulted in an over-classification of cloud, particularly over bare and
agricultural regions

Sentinel-2 `s2cloudless` data from January 25 2022 to June 7 2024 is affected, and we expect to replace these datasets
Sentinel-2 `s2cloudless` data from 25 January 2022 to 7 June 2024 is affected, and we expect to replace these datasets
over the next several months.

In the meantime, we advise the users to avoid using `s2cloudless` for cloud masking on data between these two dates,
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