Get Data

Reverb: NASA search and order tool for subsetting, reprojecting, and reformatting data.

NOTE: Reverb will be decommissioned in the coming months and replaced with Earthdata Search. All links to Reverb will be removed at that time.
Earthdata Search: NASA's newest search and order tool for subsetting, reprojecting, and reformatting data.
Data Set ID:
GLAH06

GLAS/ICESat L1B Global Elevation Data (HDF5), Version 34

GLAH06 Level-1B Global Elevation is a product that is analogous to the geodetic data records distributed for radar altimetry missions. It contains elevations previously corrected for tides, atmospheric delays, and surface characteristics within the footprint. Elevation is calculated using the ice sheet parameterization. Additional information allows the user to calculate an elevation based on land, sea ice, or ocean algorithms. Each data granule has an associated browse product.

Version Summary:

Release 34 incorporates fixes for several data issues that were determined to exist in the GLAS Release 33 data products.

Geographic Coverage

Spatial Coverage:
  • N: 86, S: -86, E: 180, W: -180

Spatial Resolution:
  • 60 m to 70 m x 60 m to 70 m
Temporal Coverage:
  • 20 February 2003 to 11 October 2009
Temporal Resolution: 23 minute
Parameter(s):
  • Glaciers/Ice Sheets > Glacier Elevation/Ice Sheet Elevation
  • Glaciers/Ice Sheets > Glacier Topography/Ice Sheet Topography
  • Sea Ice > Ice Roughness
  • Glaciers/Ice Sheets > Ice Sheets
  • Sea Ice > Reflectance > Laser Reflectance
  • Surface Radiative Properties > Reflectance > Laser Reflectance
  • Sea Surface Topography > Sea Surface Height
Platform(s) ICESAT
Sensor(s): ALTIMETERS, GLAS
Data Format(s):
  • HDF
Version: V34
Data Contributor(s): David Hancock, H. Zwally, Robert Schutz, John Dimarzio

Data Citation

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.

Zwally, H. J., R. Schutz, J. Dimarzio, and D. Hancock. 2014. GLAS/ICESat L1B Global Elevation Data (HDF5), Version 34. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: http://dx.doi.org/10.5067/ICESAT/GLAS/DATA109. [Date Accessed].
In the GLAS altimetry products is there an indicator to the presence of clouds?

Yes, it is an element of: GLA06 (GLAH06), GLA12 (GLAH12), GLA13 (GLAH13), GLA14 (GLAH14), GLA15 (GLAH15)

The Multiple Scattering Warning Flag, i_cld1_mswf (cld1_mswf_flg) is based on the total... read more

What is the basic difference between a standard and alternate fit and when would you normally choose one over the other?

The standard fit is optimized for "ice sheet-like" returns. The majority of these are single-peaked, narrow waveforms. The standard fit allows for only two peaks. Alternate fitting is meant to capture up to six peaks. More peaks are necessary for more complex waveforms over land, vegetated... read more

How to correct elevation error in GLAS altimetry data

Description of the Problem: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. Gaussian, G-C). The... read more