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NASA Distributed Active Archive Center (DAAC) at NSIDC

ICESat / GLAS Data

Ice, Cloud, and land Elevation / Geoscience Laser Altimeter System

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Data Sets

Note: Correction to ICESat Data Product Surface Elevations. In January 2013, the ICESat Project Science Team announced that a correction to ICESat surface elevation data products is necessary due to an error in the range determination from transmit-pulse reference selection (centroid vs. gaussianGaussian, G-C). The following products are affected by this finding: GLA06 (global elevation), GLA12 (ice sheet), GLA13 (sea ice), and GLA15 (ocean). GLA14 users who use the range increment for the alternative Gaussian-fitted peaks may want to also use the correction. For details, see the Correction to ICESat Data Product Surface Elevations Web page.

The following tables list the standard NASA GLAS data products and the related GLAS data products available from NSIDC. To view the documentation for the standard GLAS data products, click on the long name in the Standard GLAS Data Products table; to order the standard data, see the Order Data Web page. To view the documentation and to order data for the related GLAS data products, click on the data product name in the Related GLAS Data Products table.

The data products are grouped into the following categories:

Standard GLAS Data Products (Binary)

Note: L1A, L1B, and L2 in the data set titles refer to data processing levels, not laser identifiers.

Standard GLAS Data Products (Binary)
Short Name Long Name File Size Orbits per File Files Per Day
GLA01 GLAS/ICESat L1A Global Altimetry Data 9 MB 1/4 56
GLA02 GLAS/ICESat L1A Global Atmosphere Data 671 MB 2 7
GLA03 GLAS/ICESat L1A Global Engineering Data 19 MB 2 7
GLA04 GLAS/ICESat L1A Global Laser Pointing Data 2 MB - 386 MB 2 4
GLA05 GLAS/ICESat L1B Global Waveform-based Range Corrections Data 25 MB 1/4 56
GLA06 GLAS/ICESat L1B Global Elevation Data 7 MB 1/4 56
GLA07 GLAS/ICESat L1B Global Backscatter Data 827 MB 2 7
GLA08 GLAS/ICESat L2 Global Planetary Boundary Layer and Elevated Aerosol Layer Heights 7 MB 14 1
GLA09 GLAS/ICESat L2 Global Cloud Heights for Multi-layer Clouds 82 MB 14 1
GLA10 GLAS/ICESat L2 Global Aerosol Vertical Structure Data 289 MB 14 1
GLA11 GLAS/ICESat L2 Global Thin Cloud/Aerosol Optical Depths Data 13 MB 14 1
GLA12 GLAS/ICESat L2 Antarctic and Greenland Ice Sheet Altimetry Data 104 MB 14 1
GLA13 GLAS/ICESat L2 Sea Ice Altimetry Data 107 MB 14 1
GLA14 GLAS/ICEsat L2 Global Land Surface Altimetry Data 209 MB 14 1
GLA15 GLAS/ICESat L2 Ocean Altimetry Data 279 MB 14 1


See Preliminary ICESat/GLAS Data for information about the preliminary versions of ICESat/GLAS products first released on 31 October 2003.

Standard GLAS Data Products (HDF5)

The ICESat GLAS Release 33 HDF5 data are converted directly from the Release 33 binary data. Data files were not re-processed during conversion. However, parameters in the HDF5 files are re-ordered, re-named, and logically grouped to take advantage of the HDF5 file structure.

Note: L1A, L1B, and L2 in the data set titles refer to data processing levels, not laser identifiers.

Currently available Altimetry products:

Standard GLAS Data Products (HDF5)
Short Name Long Name File Size Orbits per File Files Per Day
GLAH01 GLAS/ICESat L1A Global Altimetry Data (HDF5) 34 MB 1/4 56
GLAH02 GLAS/ICESat L1A Global Atmosphere Data (HDF5) 437 MB 2 7
GLAH03 GLAS/ICESat L1A Global Engineering Data (HDF5) 9 MB 2 7
GLAH04 GLAS/ICESat L1A Global Laser Pointing Data (HDF5) 67 MB 2 4
GLAH05 GLAS/ICESat L1B Global Waveform-based Range Corrections Data (HDF5) 14 MB 1/4 56
GLAH06 GLAS/ICESat L1B Global Elevation Data (HDF5) 6 MB 1/4 56
GLAH07 GLAS/ICESat L1B Global Backscatter Data (HDF5) 473 MB 2 7
GLAH08 GLAS/ICESat L2 Global Planetary Boundary Layer and Elevated Aerosol Layer Heights (HDF5) 8 MB 14 1
GLAH09 GLAS/ICESat L2 Global Cloud Heights for Multi-layer Clouds (HDF5) 50 MB 14 1
GLAH10 GLAS/ICESat L2 Global Aerosol Vertical Structure Data (HDF5) 21 MB 14 1
GLAH11 GLAS/ICESat L2 Global Thin Cloud/Aerosol Optical Depths Data (HDF5) 35 MB 14 1
GLAH12 GLAS/ICESat L2 Antarctic and Greenland Ice Sheet Altimetry Data (HDF5) 43 MB 14 1
GLAH13 GLAS/ICESat L2 Sea Ice Altimetry Data (HDF5) 51 MB 14 1
GLAH14 GLAS/ICEsat L2 Global Land Surface Altimetry Data (HDF5) 167 MB 14 1
GLAH15 GLAS/ICESat L2 Ocean Altimetry Data (HDF5) 172 MB 14 1

Related GLAS Data Products

Note: The table below lists products generated using standard GLAS data products.

Related GLAS Data Products
DIF ID
Data Product Name
Projection
NSIDC-0422 Antarctic 1 km Digital Elevation Model (DEM) from Combined ERS-1 Radar and ICESat Laser Satellite Altimetry Polar Stereographic
NSIDC-0304 GLAS/ICESat 500 m Laser Altimetry Digital Elevation Model of Antarctica Polar Stereographic
NSIDC-0305 GLAS/ICESat 1 km Laser Altimetry Digital Elevation Model of Greenland Polar Stereographic
ICESat: Sea Ice Thickness and Freeboard Polar Stereographic
NSIDC-0393 Arctic Sea Ice Freeboard and Thickness Polar Stereographic