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: 
ATL04

ATLAS/ICESat-2 L2A Normalized Relative Backscatter Profiles, Version 2

ATL04 contains along-track normalized relative backscatter profiles of the atmosphere. The product includes full 532 nm (14 km) uncalibrated attenuated backscatter profiles at 25 times per second for vertical bins of approximately 30 meters. Calibration coefficient values derived from data within the polar regions are also included. 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.

There is a more recent version of these data.

Version Summary: 

Changes for this version include:

  • Corrected several issues in the ATBD related to units.
  • Modified the calibration constant code and browse images so that browse image plots are correct when calibration method #2 (cal_c) is used.
  • Added a 700-bin, relative humidity profile to ATL04 that can be passed to ATL09 to help with cloud and aerosol discrimination.
  • Atmosphere profiles were moved down by 1 bin. This corrects a discrepancy in v01 in which the atmosphere profile surface height was 30 m higher than the altimetry surface height over the ocean in the ATL12 product.
Parameter(s):
  • LIDAR > LIDAR BACKSCATTER
Data Format(s):
  • HDF5
Spatial Coverage:
N: 90, 
S: -90, 
E: 180, 
W: -180
Platform(s):ICESat-2
Spatial Resolution:
  • 280 m
Sensor(s):ATLAS
Temporal Coverage:
  • 13 October 2018 to 15 November 2019
Version(s):V2
Temporal Resolution91 dayMetadata XML:View Metadata Record
Data Contributor(s):Steve Palm, Yeukui Yang, Ute Herzfeld, David Hancock, Kristine Barbieri, et al

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.

Palm, S. P., Y. Yang, U. C. Herzfeld, D. Hancock, K. A. Barbieri, J. Wimert, and the ICESat-2 Science Team. 2019. ATLAS/ICESat-2 L2A Normalized Relative Backscatter Profiles, Version 2. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: https://doi.org/10.5067/ATLAS/ATL04.002. [Date Accessed].

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