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Description

ATL13QL is the quick look version of ATL13 and is based on the same algorithms that generate the ATL13 final data products. Once final ATL13 files are available, the corresponding ATL13QL files are removed. ATL13QL provides along-track surface water products for inland water bodies, defined as lakes, reservoirs, bays, estuaries, rivers, and a 7 km near-shore buffer. Data parameters include surface water height statistics and related parameters including significant wave height, transect slope, subsurface signal attenuation, and shallow water bathymetry. Water surface heights are provided as both orthometric height and height referencing the WGS84 ellipsoid.

Version Description

-Introduced parameters to allow for limiting of mode identification to above a certain depth to avoid bright subsurface signal to overwhelm local surface mode.
-Reduced sseg signal photon aggregation requirement for small lake/reservoirs, removed instrument effects from all analysis based on photon quality flag, and refined long segment bathymetry results for each member short segment based on its individual photon distribution.
-Made mirroring criteria water body type dependent & added apply_mirror parameter to control which types undergo mirroring processing.
-Added minimum number of photons required where downscaling long segment bathymetry to short segment scale.
-Added sseg_length and sseg_dist_from_eq to output
-Reversed 0/1 on/off assignments used for apply_mirror and limit_hist_depth arrays to match convention used for previous parameters.
-Added an improved methodology for identifying bathymetry that couples density thresholds with examination of photon distribution in the water column, controllable by water body type.
-Added apparent standard deviation to the non-anomalous short segment output.
-Updated min mirror cnt for coastal water bodies.

Product Summary

Platforms
ICESat-2
Instruments
ATLAS
Spatial Extent

N: 88 S: -88 E: 180 W: -180

Geographic Region
GLOBAL LAND
Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2025-06-07 to Present
Concept ID
C3566183861-NSIDC_CPRD
Data State
ACTIVE
Processing Level
3
Published
Science Keywords
Surface Water Features

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

Jasinski, M. F., J. D. Stoll, D. Hancock, J. Robbins, J. Nattala, J. Morison, B. M. Jones, M. E. Ondrusek, T. M. Pavelsky, C. Parrish, & ICESat-2 Science Team. (2025). ATLAS/ICESat-2 L3A Along Track Inland Surface Water Data Quick Look, Version 7 [Data set]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/ATLAS/ATL13QL.007 Date Accessed: 2025-12-25

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