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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].
No technical references available for this data set.

FAQ

Are the altimetry data already adjusted to the Geoid, or only to the Ellipsoid?

The elevation data is relative to the ellipsoid.
The data also have a parameter indicating the geoid height which is the height of the geoid above the ellipsoid for the first and last shot in the record.

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

Stepping through the HDFView User Guide with GLAS HDF5 Data
HDFView

https://support.hdfgroup.org/products/java/hdfview/

When you first open HDFView, the HDFView window appears with an empty tree and data panel.

The main window consists of six different components... read more