GLAS/ICESat L2 Global Land Surface Altimetry Data, Version 18

• Main Author: National Snow and Ice Data Center
• Format: Dataset
• Language: unknown
• Subjects: Ice Sheet; Sea ice
• Online Access: https://search.dataone.org/view/sha256:ac8efe547bd75f8a7248e9a5d54c94d67dc12e2cd4a4977ecb30d9e749ef6ff8

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 (GLA14) provides surface elevations for land. 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, and are available via FTP.