Data Set ID: 
ATL03

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

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.

There is a more recent version of these data.

Version Summary: 

Changes for this version include:

  • Added the equilibrium tide as a parameter (/gtx/geophys_corr/tide_eq).
  • Corrected the ph_id_channel description.
  • Added additional ATLAS housekeeping/status values from ATL02 to the /atlas_engineering group to fully describe the ATLAS configuration state.
  • Adopted an improved inland water mask.
  • Added DEM height and flag at the 20m geolocation segment rate. DEM height (/gtx/geophys_corr/dem_h) is the best available height from one of several region-specific and global DEMs. The DEM flag (/gtx/geophys_corr/dem_flag) indicates the DEM from which the height was retrieved.
  • Added a composite flag for POD/PPD quality at the 20m geolocation segment rate. A non-zero value indicates a possibly degraded geolocation solution.
  • Updated default uncertainties (sigma_h = 30 m; sigma_along = 20 m; sigma_across = 20 m; sigma_lat ~= 0.00018 deg; and sigma_lon = 0.00018 deg) to better represent actual uncertainties in the ATL03 photon data.
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 to 15 November 2019
Version(s):V2
Temporal Resolution91 dayMetadata XML:View Metadata Record
Data Contributor(s):Thomas Neumann, Anita Brenner, David Hancock, Scott Luthcke, Jeff Lee, John Robbins, Kaitlin Harbeck, Jack Saba, Kelly Brunt

Geographic Coverage

No access options.

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, S. B. Luthcke, J. Lee, J. Robbins, K. Harbeck, J. Saba, K. M. Brunt, A. Gibbons, et al. 2019. ATLAS/ICESat-2 L2A Global Geolocated Photon Data, Version 2. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: https://doi.org/10.5067/ATLAS/ATL03.002. [Date Accessed].

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