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Data Set ID:
GLAH01

GLAS/ICESat L1A Global Altimetry Data (HDF5), Version 33

Level-1A altimetry data (GLAH01) include the transmitted and received waveform from the altimeter. Each data granule has an associated browse product.

Version Summary:

For information about Version 33, see the NSIDC ICESat Description of Data Releases page.

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):
  • Infrared Wavelengths > Sensor Counts > Waveform
Platform(s) ICESAT
Sensor(s): ALTIMETERS, GLAS
Data Format(s):
  • HDF
Version: V33
Data Contributor(s): H. Zwally, Robert Schutz, Charles Bentley, Jack Bufton, Thomas Herring, Jean-Bernard Minster, James Spinhirne, Robert Thomas

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, C. Bentley, J. Bufton, T. Herring, J. Minster, J. Spinhirne, and R. Thomas. 2013. GLAS/ICESat L1A Global Altimetry Data (HDF5), Version 33. [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/DATA101. [Date Accessed].
In GLA01 and GLAH01 waveform plots, what does the "relative time" axis mean?

The relative time axis represents two-way travel time. Two adjacent returns separated by a relative time difference (delta_t) in nanoseconds correspond to a height difference of delta_h in centimeters such that:
delta_h = c / 2 * delta_t
where:
c is... read more

Why is spatial searching not enabled for GLA01 (GLAH01) to GLA04 (GLAH04)?

The orbit for GLA01 (GLAH01) and GLA02 (GLAH02) is a predicted orbit and does not show any target-of-opportunity pointing. The GLAS science team decided not to enable spatial searching for these two products in... read more