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

ATLAS/ICESat-2 L1B Converted Telemetry Data, Version 5

This data set (ATL02) contains science unit-converted, time-ordered telemetry data, calibrated for instrument effects, downlinked from the Advanced Topographic Laser Altimeter System (ATLAS) instrument on board the Ice, Cloud and land Elevation Satellite-2 (ICESat-2) observatory. The data are used by the ATLAS/ICESat-2 Science Investigator-led Processing System (SIPS) for system–level, quality control analysis and as source data for ATLAS/ICESat-2 Level-2 products and the Precision Orbit Determination (POD) and Precision Pointing Determination (PPD) computations.

This is the most recent version of these data.

Version Summary: 

Changes for this version include:

  • Changed transmit/receive optical misalignment calculation to use the history of the Alignment Monitoring Control System (AMCS) calibration results rather than the control loop setpoints. This is due to a change in operational practice where the AMCS setpoint is now updated only after yaw flips and misalignment is allowed to drift more than previously.
  • Added functionality to detect and correct start event/return event (TX/RX) slips; This includes discarding data from some shots and major frames and re-associating affected transmit and receive events. This is done as TX/RX slips caused prolonged errors in time-of-flight computation.

STANDARD Level of Service

Data: Data integrity and usability verified

Documentation: Key metadata and user guide available

User Support: Assistance with data access and usage; guidance on use of data in tools

See All Level of Service Details

  • LIDAR > Engineering Telemetry Ancillary Data
Data Format(s):
  • HDF5
Spatial Coverage:
N: 90, 
S: -90, 
E: 180, 
W: -180
Spatial Resolution:Not applicableSensor(s):ATLAS
Temporal Coverage:
  • 13 October 2018
Temporal ResolutionNot applicableMetadata XML:View Metadata Record
Data Contributor(s):Anthony Martino, Megan Bock, Catherine Gosmeyer, Christopher Field, Thomas Neumann, David Hancock, Robert Jones III, Philip Dabney, Charles Webb

Geographic Coverage

Other Access Options

Other 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.

Martino, A. J., M. R. Bock, C. Gosmeyer, C. Field, T. A. Neumann, D. Hancock, R. L. Jones III, P. W. Dabney, C. E. Webb, and J. Lee. 2021. ATLAS/ICESat-2 L1B Converted Telemetry Data, Version 5. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: [Date Accessed].

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How To

Programmatic Data Access Guide
Data from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) can be accessed directly from our HTTPS file system or through our Application Programming Interface (API). Our API offers you the ability to order data using specific temporal and spatial filters... read more
ICESat, IceBridge, and ICESat-2: A primer on data access across the three missions
This guide will provide an overview of the altimetry measurements and data sets across the missions, as well as a guide for accessing the data through NASA Earthdata Search and programmatically using an Application Programming Interface (API). Overview The NASA ICESat, Operation IceBridge, and... read more
Explore, Access, and Customize ICESat-2 data at the NASA NSIDC DAAC
This webinar introduces the ICESat-2 mission and shows you how to explore, access and customize ICESat-2 data with the OpenAltimetry application, using NSIDC DAAC tools, and shows you how to subset, reformat and analyze the data using Python. This webinar was originally presented on July 23, 2019... read more
Search, order, and customize NSIDC DAAC data with NASA Earthdata Search
NASA Earthdata Search is a map-based interface where a user can search for Earth science data, filter results based on spatial and temporal constraints, and order data with customizations including re-formatting, re-projecting, and spatial and parameter subsetting. Thousands of Earth science data... read more
Filter and order from a data set web page
Many NSIDC data set web pages provide the ability to search and filter data with spatial and temporal contstraints using a map-based interface. This article outlines how to order NSIDC DAAC data using advanced searching and filtering.  Step 1: Go to a data set web page This article will use the... read more
How do I convert an HDF5/HDF-EOS5 file into binary format?
To convert HDF5 files into binary format you will need to use the h5dump utility, which is part of the HDF5 distribution available from the HDF Group. How you install HDF5 depends on your operating system. Full instructions for installing and using h5dump on Mac/Unix and... read more


What subsetting and reformatting services are available for ICESat-2 data?
The following table describes the subsetting and reformatting services that are currently available for ICESat-2 data via the NASA Earthdata Search tool, along with ... read more