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NASA Distributed Active Archive Center (DAAC) at NSIDC

ICESat / GLAS Data

Ice, Cloud, and land Elevation / Geoscience Laser Altimeter System

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Product Format and Definition Changes with Release-22

  • The listings for GLA01, GLA05, and GLA07 changed to indicate they are now a pass-through for i_OrbFlg

  • The listings for GLA02 and GLA07 changed to indicate they are now a pass-through for i_g_TxNrg_qf and i_ir_TxNrg_qf

  • The product units for i_RMSpulseWd changed from "ns" to "100 ns" in GLA05

  • In GLA05, the variable i_spare6 was changed and a new saturation index variable, i_satNdx, was added. This represents the count of the number of gates in a waveform that have an amplitude greater than or equal to i_satNdxTh (a variable in ANC07). This saturation index variable has a minimum value of 0 and a maximum value of 255. Values greater than 255 are reset to 255 before being written to the product

  • The variable i_FrameQF is now a pass-through for GLA05

  • The description changed for i_beam_azimuth in GLA05 and GLA07.

  • For GLA07, product units changed to e11/(m-sr) for i5_ir_bscs, i40_ir_bscs, i_g_mbscs, and i_ir_mbscs

  • The maximum value for i_OrbFlg changed to 128 in GLA01, GLA02, and GLA05