For a list of known issues with this product, see the Known Issues document under the Technical References tab.
On Wednesday, August 5th between 9 a.m. and 10 a.m. (USA Mountain Time), the following data collections may not be available due to planned system maintenance: AMSR-E, Aquarius, High Mountain Asia, IceBridge, ICESat/GLAS, MEaSUREs, MODIS, NISE, SMAP, and VIIRS.
Data Set ID:
ATL12

ATLAS/ICESat-2 L3A Ocean Surface Height, Version 3

This data set (ATL12) contains along-track sea surface heights at variable length scales over cloud-free regions. Estimates of height distributions, surface roughness, surface slope, 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:

  • The parameters gt[x]/ssh_segments/heights/xbind, gt[x]/ssh_segments/heights/htybin, gt[x]/ssh_segments/heights/xrbin, and ds_xbin were added to the product to report 10 m bin average heights and averaged photon rate information output by the sea state bias calculation.
  • The ocean histograms were updated to have a center bin with a zero height, consistent with the ATBD.
  • New scatter plots were added to the browse images to better visualize the data. Previous browse images for heights and ground tracks (as well as new plots) are now separated by orbit.
  • The width of the received histogram as determined in fine_sel is now used to create the y histogram in rm_uncertainty, which is then used in char_rss to create simulated photons that are used in fit2g to determine a two Gaussian fit.
  • The moments of Y are now calculated as described in the ATBD for ATL12.
  • The h_kurtosis calculation has been corrected to match the description in the ATBD for ATL12.
  • The length_seg parameter is now calculated as the difference of the along-track x of the first and last signal photons in the ocean segment. This calculation is now consistent with the ATBD for ATL12.
  • A new formula for calculating the 10-m bin average photon rate was implemented.

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 SURFACE TOPOGRAPHY > SEA SURFACE HEIGHT
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:
  • 13 October 2018
Version(s):V3
Temporal Resolution91 dayMetadata XML:View Metadata Record
Data Contributor(s):James Morison, David Hancock, Suzanne Dickinson, John Robbins, Leeann Roberts, et al

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.

Morison, J. H., D. Hancock, S. Dickinson, J. Robbins, L. Roberts, R. Kwok, S. P. Palm, B. Smith, M. F. Jasinski, and the ICESat-2 Science Team. 2020. ATLAS/ICESat-2 L3A Ocean Surface Height, 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/ATL12.003. [Date Accessed].

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