GLAS/ICESat L1A Global Altimetry Data, Version 33

• Main Authors: NASA National Snow and Ice Data Center Distributed Active Archive Center, National Snow and Ice Data Center
• Format: Dataset
• Language: unknown
• Subjects: Ice Sheet; Sea ice
• Online Access: https://search.dataone.org/view/sha256:88c06a654462d301068b1cf6f9d420ec99f239c54efdd9f45e4fbfb394485afa

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-1A altimetry data (GLA01) include the transmitted and received waveform from the altimeter. 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.