On Wednesday, September 22nd from 9:00 a.m. to 11:00 a.m. (USA Mountain Time), the following data collections may not be available due to planned system maintenance: AMSR-E, Aquarius, High Mountain Asia, IceBridge, ICESat/GLAS, ICESat-2, MEaSUREs, MODIS, NISE, SMAP, SnowEx, and VIIRS.
Data Set ID:
GLA09

GLAS/ICESat L2 Global Cloud Heights for Multi-layer Clouds, Version 33

NOTE ON GLAS BINARY DATA: Access to all ICESat/GLAS binary data products at NSIDC DAAC was removed 01 August 2017. The Binary Data Subsetter also has been decommissioned. ICESat/GLAS data remain available in HDF5 format.

The Geoscience Laser Altimeter System (GLAS) instrument on the Ice, Cloud, and Land Elevation Satellite (ICESat) provides global measurements of polar ice sheet elevation to discern changes in ice volume (mass balance) over time. Secondary objectives of GLAS are to measure sea ice roughness and thickness, cloud and atmospheric properties, land topography, vegetation canopy heights, ocean surface topography, and surface reflectivity.

GLAS has a 1064 nm laser channel for surface altimetry and dense cloud heights, and a 532 nm lidar channel for the vertical distribution of clouds and aerosols.

Level-2 cloud heights for multi-layer clouds (GLA09) contain cloud layer top and bottom height data at sampling rates of 4 sec, 1 sec, 5 Hz, and 40 Hz.

Each data granule has an associated browse product that users can quickly view to determine the general quality of the data in the granule. Browse products consist of image plots of key parameters and statistics. Data are in scaled integer binary format, big-endian (Unix) byte order.

Version Summary:

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

Parameter(s):
  • Clouds > Cloud Height > CLOUD HEIGHT
  • Clouds > Cloud Vertical Distribution > CLOUD VERTICAL DISTRIBUTION
Data Format(s):
  • Binary
Spatial Coverage:
N: 86, 
S: -86, 
E: 180, 
W: -180
Platform(s):ICESAT
Spatial Resolution:
  • 60 m to 70 m x 60 m to 70 m
Sensor(s):ALTIMETERS, GLAS
Temporal Coverage:
  • 20 February 2003 to 11 October 2009
Version(s):V33
Temporal Resolution1288 minuteMetadata XML:View Metadata Record
Data Contributor(s):H. Zwally, Robert Schutz, Steve Palm, William Hart, Dennis Hlavka, James Spinhirne, Ellsworth Welton

Geographic Coverage

No access options.

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, W. Hart, D. Hlavka, S. P. Palm, J. Spinhirne, and E. Welton. 2011. GLAS/ICESat L2 Global Cloud Heights for Multi-layer Clouds, Version 33. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: https://doi.org/10.5067/ICESAT/GLAS/DATA222. [Date Accessed].

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How To

Filter and order from a data set web page
Many NSIDC data set web pages provide the ability to search and filter data with spatial and temporal contstraints using a map-based interface. This article outlines how to order NSIDC DAAC data using advanced searching and filtering.  Step 1: Go to a data set web page This article will use the... read more