On Wednesday, July 28 from 8:00 a.m. to 4:00 p.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, ICESat-2, MEaSUREs, MODIS, NISE, SMAP, SnowEx, and VIIRS.
Data Set ID: 
ATL02

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

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.

There is a more recent version of these data.

Version Summary: 

Changes for this version include:

  • Fully verified and debugged outputs used to help confirm the time of flight (TOF) and transmitter echo path (TEP) calculations.
  • Receiver skews are now calculated from on-orbit data to improve precision and fidelity.
  • Updated the description of ph_id_channel to clarify and correct errors in the documentation.
  • Clarified and corrected errors in the ATL02 ATBD and data dictionary related to units and descriptions.
  • Changed the thermistor used for LRS-based laser energy conversions from the LRS_HKT packet to the ldc_t (channel 33). The code now uses the temperature sensor on which CAL 54 was based.
  • Fixed the code to correctly record the CAL47 calibrations used to compute receiver sensitivity. Replaced a bad CAL47 instance, which affected “spot 2” background and return sensitivity, with a corrected instance.
  • Fixed an issue that erroneously set the useflag to “AMCS CAL”. The useflag now only indicates "AMCS CAL" when an AMCS calibration is occurring.
Parameter(s):
  • LIDAR > Engineering Telemetry Ancillary Data
Data Format(s):
  • HDF5
Spatial Coverage:
N: 90, 
S: -90, 
E: 180, 
W: -180
Platform(s):ICESat-2
Spatial Resolution:Not applicableSensor(s):ATLAS
Temporal Coverage:
  • 13 October 2018 to 11 March 2020
Version(s):V2
Temporal ResolutionNot applicableMetadata XML:View Metadata Record
Data Contributor(s):Anthony Martino, Megan Bock, Robert Jones III, Thomas Neumann, David Hancock, Philip Dabney, Charles Webb

Geographic Coverage

No 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, R. L. Jones III, T. A. Neumann, D. Hancock, P. W. Dabney, and C. E. Webb. 2019. ATLAS/ICESat-2 L1B Converted Telemetry Data, Version 2. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: https://doi.org/10.5067/ATLAS/ATL02.002. [Date Accessed].

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