Data Set ID:

GLAS/ICEsat L2 Global Land Surface Altimetry Data (HDF5), Version 34

GLAH06 is used in conjunction with GLAH05 to create the Level-2 altimetry products. Level-2 altimetry data provide surface elevations for ice sheets (GLAH12), sea ice (GLAH13), land (GLAH14), and oceans (GLAH15). Data also include the laser footprint geolocation and reflectance, as well as geodetic, instrument, and atmospheric corrections for range measurements. The Level-2 elevation products, are regional products archived at 14 orbits per granule, starting and stopping at the same demarcation (± 50° latitude) as GLAH05 and GLAH06. Each regional product is processed with algorithms specific to that surface type. Surface type masks define which data are written to each of the products. If any data within a given record fall within a specific mask, the entire record is written to the product. Masks can overlap: for example, non-land data in the sea ice region may be written to the sea ice and ocean products. This means that an algorithm may write the same data to more than one Level-2 product. In this case, different algorithms calculate the elevations in their respective products. The surface type masks are versioned and archived at NSIDC, so users can tell which data to expect in each product. 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.

Get Data

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

Geographic Coverage

Data Set Tabs

Temporal Coverage:
  • 2003-02-20 to 2009-10-11
Temporal Resolution:
1288 minute
Spatial Coverage:
  • N: 86, S: -86, E: 180, W: -180

Spatial Resolution:
  • 60 m to 70 m x 60 m to 70 m
  • Surface Radiative Properties > Reflectance > Laser Reflectance
  • Topography > Terrain Elevation
Data Format(s):
  • HDF
Data Contributor(s): H. Zwally, Robert Schutz, John Dimarzio

We kindly request that you cite the use of this data set in a publication using the following citation. For more information, see Use and Copyright.

Zwally, H. J., R. Schutz, D. Hancock, and J. Dimarzio. 2014. GLAS/ICEsat L2 Global Land Surface Altimetry Data (HDF5), Version 34. [indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center.

Questions? Please contact:

NSIDC User Services
Phone: 1 303 492-6199
Fax: 1 303 492-2468
Contact Address:
National Snow and Ice Data Center
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA