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Description

ATL20QL is the Quick Look (QL) version of ATL20 with an expedited latency of 3‒5 days. QL data are based on the same algorithms that generate the standard products but do not undergo the same rigorous quality checks; thus, they should be used with caution. Once final files are available, the corresponding QL files are removed. ATL20QL contains rolling 30-day gridded estimates of sea ice freeboard, derived from ATLAS/ICESat-2 L3A Sea Ice Freeboard Quick Look (ATL10QL) along-track freeboard estimates.

Version Description

Initial release

Product Summary

Platforms
ICESat-2
Instruments
ATLAS
Projects
LANCE ,
SNWG
Spatial Extent

N: 89 S: 37 E: 180 W: -180

,

N: -53 S: -79 E: 180 W: -180

Spatial Resolution
25 Kilometers x 25 Kilometers
Spatial Reference System(s)
Multiple EPSG codes (see User Guide)
Location
POLAR
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2018-10-14 to Present
Concept ID
C4139644977-NSIDC_CPRD
Data State
ACTIVE
Number of Files/Granules
206
Processing Level
3
Published
Science Keywords
Freeboard

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Kwok, R., Kurtz, N., Wimert, J. T., Petty, A. A., Cunningham, G. F., Markus, T., Hancock, D. W., Ivanoff, A., Bagnardi, M., Herzfeld, U., Trantow, T., & ICESat-2 Science Team. (2026). ATLAS/ICESat-2 L3B Gridded Sea Ice Freeboard Quick Look, Version 5 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/ATLAS/ATL20QL.005 Date Accessed: 2026-09-21

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