• 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 3-Month Gridded Dynamic Ocean Topography, Version 1
Data set id:
ATL23
DOI: 10.5067/ATLAS/ATL23.001
This is the most recent version of these data.
Version Summary
Initial release
In this section
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Overview

This data set contains 3-month gridded averages of dynamic ocean topography (DOT) over midlatitude, north-polar, and south-polar grids derived from the 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. Both single beam and all-beam gridded averages are available. Simple averages, degree-of-freedom averages, and averages interpolated to the center of grid cells are included, as well as uncertainty estimates.
Parameter(s):
SEA SURFACE HEIGHT
Platform(s):
ICESat-2
Sensor(s):
ATLAS
Data Format(s):
HDF5
Temporal Coverage:
13 October 2018 to present
Temporal Resolution:
  • 3 month
Spatial Resolution:
  • 25 km
  • 25 km
Spatial Reference System(s):
NSIDC Sea Ice Polar Stereographic North
EPSG:3411

NSIDC Sea Ice Polar Stereographic South
EPSG:3412

WGS 84
EPSG:4326
Spatial Coverage:
N:
88
S:
-88
E:
180
W:
-180
Blue outlined yellow areas on the map below indicate the spatial coverage for this data set.

Data Access & Tools

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HTTPS File System

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Quickly download a few files using a web browser, or access data through a command-line utility such as WGET.
Programmatic Data Access Guide
Type:
service
Last updated:
View Metadata

Data Access Tool

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Filter files before downloading based on date, spatial area, or file name. Choose from various download options, such as Python script. Export bounding boxes as a GeoJSON.
Filter and order from a data set web page
Type: Web Application
Last updated:
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NASA Earthdata Search

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Search and order data from all NASA DAACs using spatial and temporal filters in a map interface. Reformatting, reprojecting, and subsetting options are available for some data sets.
How to search, order, and customize data with NASA Earthdata Search
Type: Web Application

Bulk Programmatic Data Access Service

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Programmatically request selected data products through NSIDC's API. Bulk download using spatial and temporal filters, or incorporate data access commands into code/scripts as needed.
Programmatic Data Access Guide
Type:
service
Last updated:
View Metadata

NASA Earthdata Cloud (AWS S3)

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Access data directly from the NASA Earthdata Cloud via Amazon Web Services Simple Storage Service (AWS S3). This access option is only available when working within the us-west-2 region and requires additional AWS S3 credentials.
NASA Earthdata Cloud Data Access Guide
AWS S3 Credentials
Type:
service
View Metadata

Customized Programmatic Data Access Service

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Customize
Programmatically request selected data products through our API. This tool is valuable for selecting just the parameters you need from big data sets. Apply spatial and temporal filters, subsetting, reformatting, and reprojection.
Programmatic Data Access Guide
Type:
service
Last updated:
View Metadata
Customization Capabilities:
data reformatting
reprojection
spatial subsetting
variable subsetting
Interpolation Options:
Bicubic Interpolation
Bilinear Interpolation
Nearest Neighbor
Output Projections:
Geographic
Universal Transverse Mercator
Polar Stereographic
Lambert Azimuthal Equal Area
Cylindrical Equal Area
Output Formats:
HDF5
ASCII
GEOTIFF
HDF5
NETCDF-3
NETCDF-4
 

HDFView

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Explore contents of HDF4 and HDF5 files, including file structure, metadata, and parameter values.
HDFView 3.X User's Guide
Type: Downloadable Software
Output Formats:
ASCII
HDF4
HDF5

NASA LaRC Satellite Overpass Predictor

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Calculate past and future satellite overpasses, based on latitude/longitude or map location.
Type: Web Application

Panoply Data Viewer

Visualize
Analyze
Visualize georeferenced arrays in NetCDF, HDF and GRIB formats. Plot data on global or regional maps, choosing from multiple map projections. Overlay continent outlines or masks.
Type: Downloadable Software
Output Formats:
ASCII
CSV
GIF
HDF-EOS2
HDF-EOS5
HDF4
HDF5
JPEG
KML
NETCDF-3
NETCDF-4
PNG
TIFF

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.

Documentation

Help Articles

General Questions & FAQs

FAQs About NSIDC DAAC's Earthdata Cloud Migration
This article covers frequently asked questions about the NASA NSIDC DAAC's Earthdata cloud migration project and what it means to data users.
Read More
What subsetting and reformatting services are available for ICESat-2 data?
This short article describes the customization services available for ICESat-2 data using Earthdata Search.
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How to Articles

NASA Earthdata Cloud Data Access Guide
The NASA Earthdata Cloud is the NASA cloud-based archive of Earth observations. It is hosted by Amazon Web Services (AWS). Learn how to find and access NSIDC DAAC data directly in the cloud.
Read More