• The ATL09 nighttime calibration of the attenuated, calibrated backscatter profiles from approximately 1 Dec 2024 to 20 Nov 2025 is poor due to hard limits on the minimum values used to compute the calibration and on the minimum value of the calibration itself. For more information, refer to the Known Issues document.

Blue outlined yellow areas on the map below indicate the spatial coverage for this data set.

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General Questions & FAQs

This article covers frequently asked questions about the NASA NSIDC DAAC's Earthdata cloud migration project and what it means to data users.