For a list of known issues with this product, see the Known Issues document under the Technical References tab.
VERSION 3: 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' document under Technical References.
Data Set ID:
ATL07

ATLAS/ICESat-2 L3A Sea Ice Height, Version 4

The data set (ATL07) contains along-track heights for sea ice and open water leads (at varying length scales) relative to the WGS84 ellipsoid (ITRF2014 reference frame) after adjustment for geoidal and tidal variations, and inverted barometer effects. Height statistics and apparent reflectance are also provided. The data were acquired by the Advanced Topographic Laser Altimeter System (ATLAS) instrument on board the Ice, Cloud and land Elevation Satellite-2 (ICESat-2) observatory.

This is the most recent version of these data.

Version Summary:

Changes for this version include:

  • Confirmed proper marking of invalid parameters from ATL03 to ATL09, including ocean tide. If an invalid is found, the average for the segment is set to invalid.
  • Meteorological data from ATL09 for the weak beam has been properly aligned with the strong beam by using distance instead of time.
  • Removed geolocation segments with poor orbit or poor pointing quality from being used by using the podppd_flag from ATL03.
  • Dynamically converted MSS values to the tide-free system.
  • Dynamically adjusted sea ice coarse track height filters for the tide-free system.
  • Read the free2mean parameters from ATL03 and averaged them to a sea ice segment rate in to ATL07.
  • Fixed error in calculation of sea ice segment length to correctly measure length and remove negative results.
  • Fixed error in the computation of first photon bias.

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):
  • SEA ICE > SEA ICE ELEVATION
Data Format(s):
  • HDF5
Spatial Coverage:
N: 90, 
S: -90, 
E: 180, 
W: -180
Platform(s):ICESat-2
Spatial Resolution:
  • Varies
Sensor(s):ATLAS
Temporal Coverage:
  • 14 October 2018
Version(s):V4
Temporal Resolution91 dayMetadata XML:View Metadata Record
Data Contributor(s):Ron Kwok, Alek Petty, Glenn Cunningham, Thorsten Markus, David Hancock, Alvaro Ivanoff, Jesse Wimert, Marco Bagnardi, Nathan Kurtz

Geographic Coverage

Other Access Options

Other Access Options

Close

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.

Kwok, R., A. A. Petty, G. Cunningham, T. Markus, D. Hancock, A. Ivanoff, J. Wimert, M. Bagnardi, N. Kurtz, and the ICESat-2 Science Team. 2021. ATLAS/ICESat-2 L3A Sea Ice Height, Version 4. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: https://doi.org/10.5067/ATLAS/ATL07.004. [Date Accessed].

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