• For a list of known issues with this product, see the Known Issues document under the Documentation section of the page.

  • Data from 13 November 2022 to 26 October 2023 in Version 6 of ATL03, ATL04, and their derived products will be reprocessed to ITRF2014. See the Data Announcement for details.

ATLAS/ICESat-2 L3B Monthly Gridded Dynamic Ocean Topography, Version 3
Data set id:
DOI: 10.5067/ATLAS/ATL19.003
This is the most recent version of these data.
Version Summary
Major changes for Version 3 include:

-Removed the effects of sea state bias from DOT
-Updated the prerequisites for calculating bin center values to require a minimum of four ocean segments and two orbits in the cell and the surrounding eight cells
-Updated the calculation of ssb_avgcntr and ssb_dfwcntr
-Used ANC50 for land-masking and added landmask to each region folder
-Updated processing to use only the ATL12 data that have times included in the time range requested in the control file
-Implemented along-track pre-grid filtering by latitude bands
-Corrected dot_hist_albm to be aggregate probability functions of DOT
-Populated parameter ice_conc_albm in the top groups and ice_conc in the beam sub-groups
-Added grid data for podppd_flag_prcnt and podppd_flag_prcnt_albm
-Added an override flag (podppd_edit) to /ancillary_data/ocean/


This data set contains monthly gridded dynamic ocean topography (DOT), derived from along-track ATLAS/ICESat-2 L3A Ocean Surface Height product (ATL12). Monthly gridded sea surface height (SSH) can be calculated by adding the mean DOT and the weighted average geoid height also provided in this data set. Both single beam and all-beam gridded averages are available in this data set. Single beam averages are useful to identify biases among the beams and the all-beam averages are advised to use for physical oceanography.
Data Format(s):
Temporal Coverage:
13 October 2018 to present
Temporal Resolution:
  • 1 month
Spatial Resolution:
  • 25 km
  • 25 km
Spatial Reference System(s):
NSIDC Sea Ice Polar Stereographic North

NSIDC Sea Ice Polar Stereographic South

WGS 84
Spatial Coverage:
Blue outlined yellow areas on the map below indicate the spatial coverage for this data set.

Data Access & Tools

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Sample Data Image

Monthly gridded (ATL19) and monthly 3-month gridded averages (ATL23) of dynamic ocean topography (DOT) over mid latitudes

The movie at this link: https://www.youtube.com/watch?v=9wV9WKh2kRg shows monthly gridded (ATL19) and monthly 3-month gridded averages (ATL23) of dynamic ocean topography (DOT) over mid latitudes.

Additional movies such as DOT uncertainty, ice concentration and significant wave height for mid latitude, north-polar and south-polar grids can be downloaded from: https://github.com/suzanne64/ICESat-2_Ocean/tree/main/movies.

Movie credit: Suzanne Dickinson, Applied Physics Laboratory, University of Washington.

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