For a list of known issues with this product, see the Known Issues document under the Technical References tab.
Selected granules for ATL03 and associated products (ATL04, ATL06, ATL07, ATL08, ATL09, ATL10, ATL12, ATL13) have been recalled and will be released at a later time. For a list of recalled data, see the 'Retracted Data File List - 02 November 2020' document under Technical References.
Data Set ID:
ATL03

ATLAS/ICESat-2 L2A Global Geolocated Photon Data, Version 3

This data set (ATL03) contains height above the WGS 84 ellipsoid (ITRF2014 reference frame), latitude, longitude, and time for all photons downlinked by the Advanced Topographic Laser Altimeter System (ATLAS) instrument on board the Ice, Cloud and land Elevation Satellite-2 (ICESat-2) observatory. The ATL03 product was designed to be a single source for all photon data and ancillary information needed by higher-level ATLAS/ICESat-2 products. As such, it also includes spacecraft and instrument parameters and ancillary data not explicitly required for ATL03.

This is the most recent version of these data.

Version Summary:

Changes for this version include:

  • Added a QA parameter that indicates the percent of reference photons within a certain distance from the reference DEM (at the geolocation segment rate). The threshold difference for each possible confidence level of reference photons is: 50 m for high confidence; 100 m for medium confidence; 200 m for low confidence; and 200 m for buffer/noise-level reference photons.
  • Fixed a logic error in the code that combines the POD and PPD degrade values. In conjunction with this fix, the definition of the podppd_flag parameter was changed to simply indicate if POD, PPD, or both report, in general, a degraded geolocation solution. The previous approach was deemed overly complex for users.
  • Effectively removed from consideration by the signal classification processing any photons from telemetry bands that do not intersect the DEM height within a +/- 30 m buffer. Additionally, photons that are poorly geolocated (as indicated by the podppd_flag) are no longer classified as potential signal.
  • Created two new parameters (/gtx/geolocation/near_sat_frac and /gtx/geolocation/full_sat_frac) that indicate nearly or fully saturated ATLAS shots. These parameters report the percentage of observed shots that are nearly or fully saturated within a geolocation segment.

COMPREHENSIVE Level of Service

Data: Data integrity and usability verified; data customization services available for select data

Documentation: Key metadata and comprehensive user guide available

User Support: Assistance with data access and usage; guidance on use of data in tools and data customization services

See All Level of Service Details

Parameter(s):
  • TOPOGRAPHY > TERRAIN ELEVATION
Data Format(s):
  • HDF5
Spatial Coverage:
N: 90, 
S: -90, 
E: 180, 
W: -180
Platform(s):ICESat-2
Spatial Resolution:
  • 70 cm x 70 cm
Sensor(s):ATLAS
Temporal Coverage:
  • 13 October 2018
Version(s):V3
Temporal Resolution91 dayMetadata XML:View Metadata Record
Data Contributor(s):Thomas Neumann, Anita Brenner, David Hancock, John Robbins, Jack Saba, Kaitlin Harbeck, Aimée Gibbons, Jeff Lee, Scott Luthcke

Geographic Coverage

Other Access Options

Other Access Options

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As a condition of using these data, you must cite the use of this data set using the following citation. For more information, see our Use and Copyright Web page.

Neumann, T. A., A. Brenner, D. Hancock, J. Robbins, J. Saba, K. Harbeck, A. Gibbons, J. Lee, S. B. Luthcke, T. Rebold, et al. 2020. ATLAS/ICESat-2 L2A Global Geolocated Photon Data, Version 3. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: https://doi.org/10.5067/ATLAS/ATL03.003. [Date Accessed].

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