GLAS/ICESat L2 Ocean Surface Altimetry Data, Version 33

Data set id:

GLA15

DOI: 10.5067/3BDTGLRR1GLD

Data Citation and Acknowledgment
As a condition of using these data, you must cite the use of this data set. Such a practice gives credit to data set producers and advances principles of transparency and reproducibility.

Zwally, H. J., Schutz, R., Bentley, C., Bufton, J., Minster, J., Spinhirne, J. & Thomas, R. (2011). GLAS/ICESat L2 Ocean Surface Altimetry Data. (GLA15, Version 33). [Data Set]. Boulder, Colorado USA. National Snow and Ice Data Center. https://doi.org/10.5067/3BDTGLRR1GLD. [describe subset used if applicable]. Date Accessed 12-11-2024.

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There is a more recent version of these data.
Version Summary

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

Overview

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. This level-2 altimetry product (GLA15) provides surface elevations for oceans. Data also include the laser footprint gelocation and reflectance, as well as geodetic, instrument, and atmospheric corrections for range measurements. 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.

Parameter(s):

LASER REFLECTANCESEA SURFACE HEIGHTSEA SURFACE SLOPE

Platform(s):

ICESAT

Sensor(s):

ALTIMETERS, GLAS

Data Format(s):

Binary

Temporal Coverage:

20 February 2003 to 11 October 2009

Temporal Resolution:

Not Specified

Spatial Resolution:

Not Specified

Spatial Coverage:

N:

86

S:

-86

E:

180

W:

-180

Blue outlined yellow areas on the map below indicate the spatial coverage for this data set.

View Metadata Record

Data Access & Tools

This data set has been retired. There is a more recent version of these data.

Documentation

General Resources

ICESat/GLAS Surface-Type Mask

Help Articles

General Questions & FAQs

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

The ICESat/GLAS elevation data are relative to the ellipsoid. The data also have a parameter indicating the geoid height, which is the height of the EGM2008 geoid above the TOPEX/Poseidon ellipsoid for the first and last shot in the record:

How to Articles

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