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ICESat / GLAS Data

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

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Product Format and Definition Changes with Release-24

The record length was changed for the following products:

Product New Length
GLA06 6880
GLA11 3032
GLA12 6600
GLA13 6760
GLA14 10000
GLA15 6280

Other changes, including new parameters, for products GLA05 - GLA15 are summarized below. More information about product formats is available on the NASA Wallops Flight Facility's Web site at Version 5.0 GLAS Files.

GLA05

  • Changed scale and max value for parameters d_wfFitSDev_1, d_wfFitSDev_2 & d_DevFitTr; scale changed from 0.001 to 0.0d-5 and max value to 30000
  • Changed the description for i_ElvFlg
  • Changed i_spare6 to i_spare6 (110)
  • Added the following new parameter i_RecNrgAll (40)

GLA06

  • Changed record length to 6880
  • Changed the description for i_ElvFlg and i_SurfRuf_slpQF
  • Changed definitions for i_CorrStatFlg
  • Added i_DEM_hires_src & i_DEM_hires_elv and a PDF created for i_DEM_hires_src (PDF fixed in a later release for the addition of GLA12 and GLA13)
  • Changed i_spare6 and added i_spare7 (556)
  • Also added the following new parameters:
    i_DEM_hires_src (40)
    i_DEM_hires_elv (40)
    i_satNdx(40)
    i_satRngCorr(40)
    i_satCorrFlg(40)
    i_satNrgCorr(40)
    i_satPwdCorr(40)
    i_gval_rcv(40)
    i_RecNrgAll(40)
    i_FRir_cldtop(40)
    i_FRir_qaFlag(40)
    i_FRir_ODflg(40)
    i_FRir_intsig(40)
    i_msRngCorr (40)
    i_msCorrFlg (40)
    i_Surface_temp
    i_Surface_pres
    i_Surface_relh

GLA07

  • Changed definitions for i1_g_bscs_qf in i_532AttBS_Flag
  • Changed i_spare4 to i_spare4 (130)
  • Renamed i_rng2CDProf to i_Rng2CDProf_Cor and changed description
  • Renamed i_Rng2PCProf to i_Rng2PCProf_Cor and changed description
  • Added the following new parameters:
    i_Surface_temp
    i_Surface_pres
    i_Surface_relh
    i_Surface_wind
    i_Surface_wdir

GLA08

  • Changed i_spare2 to i_spare2 (264)
  • Added the following new parameters:
    i_SolarAngle (4)
    i_Aer_top_b20_temp (5)
    i_Aer_top_b20_pres (5)
    i_Aer_top_b20_relh (5)
    i_Aer_bot_b20_temp (5)
    i_Aer_bot_b20_pres (5)
    i_Aer_bot_b20_relh (5)
    i_Aer_top_a20_temp (3)
    i_Aer_top_a20_pres (3)
    i_Aer_top_a20_relh (3)
    i_Aer_bot_a20_temp (3)
    i_Aer_bot_a20_pres (3)
    i_Aer_bot_a20_relh (3)
    i_Aer_PBL_LR_temp
    i_Aer_PBL_LR_pres
    i_Aer_PBL_LR_relh
    i_Aer_ir_top (2)
    i_Aer_ir_bot (2)
    i_Aer_ir_layflg (2)
    i_Aer_ir_top_temp (2)
    i_Aer_ir_top_pres (2)
    i_Aer_ir_top_relh (2)
    i_Aer_ir_bot_temp (2)
    i_Aer_ir_bot_pres (2)
    i_Aer_ir_bot_relh (2)
    i_Surface_temp (4)
    i_Surface_pres (4)
    i_Surface_relh (4)
    i_Surface_wind (4)
    i_Surface_wdir (4)

GLA09

  • Changed scaling in i_FRg_grd_sig and i_FRir_grd_sig, from 1.0d-11 to i.0d-9 plus changed prod units from e11/m-sr to e9/m-sr
  • Changed i_spare4 to i_spare4 (590)
  • Created PDF for i_LRir_QAflag
  • Created PDF for i_MRir_QAflag
  • Created PDF for i_FRir_qaFlag
  • Added the following new parameters:
    i_FRir_cldtop (160)
    i_FRir_qaFlag (160)
    i_FRir_intsig (160)
    i_SolarAngle (4)
    i_LRir_cld_top (10)
    i_LRir_cld_bot (10)
    i_LRir_QAflag (10)
    i_LRir_cldtop_temp (10)
    i_LRir_cldtop_pres (10)
    i_LRir_cldtop_relh (10)
    i_LRir_cldbot_temp (10)
    i_LRir_cldbot_pres (10)
    i_LRir_cldbot_relh (10)
    i_MRir_cld_top (10,4)
    i_MRir_cld_bot (10,4)
    i_MRir_QAflag (10,4)
    i_MRir_cldtop_temp (10,4)
    i_MRir_cldtop_pres (10,4)
    i_MRir_cldtop_relh (10,4)
    i_MRir_cldbot_temp (10,4)
    i_MRir_cldbot_pres (10,4)
    i_MRir_cldbot_relh (10,4)
    i_LRg_cldtop_temp (10)
    i_LRg_cldtop_pres (10)
    i_LRg_cldtop_relh (10)
    i_LRg_cldbot_temp (10)
    i_LRg_cldbot_pres (10)
    i_LRg_cldbot_relh (10)
    i_MRg_cldtop_temp (10,4)
    i_MRg_cldtop_pres (10,4)
    i_MRg_cldtop_relh (10,4)
    i_MRg_cldbot_temp (10,4)
    i_MRg_cldbot_pres (10,4)
    i_MRg_cldbot_relh (10,4)
    i_LRg_SourceFt
    i_MRg_SourceFt (4)
    i_HRg_SourceFt (20)
    i_LRir_SourceFt
    i_MRir_SourceFt (4)
    i_Surface_temp (4)
    i_Surface_pres (4)
    i_Surface_relh (4)
    i_Surface_wind (4)
    i_Surface_wdir (4)

GLA10

  • Changed i_spare5 to i_spare5 (292)
  • Added the following new parameters:
    i_SolarAngle (4)
    i_MRg_cldtop_temp (10,4)
    i_MRg_cldtop_pres (10,4)
    i_MRg_cldtop_relh (10,4)
    i_MRg_cldbot_temp (10,4)
    i_MRg_cldbot_pres (10,4)
    i_MRg_cldbot_relh (10,4)
    i_Aer_top_temp (9)
    i_Aer_top_pres (9)
    i_Aer_top_relh (9)
    i_Aer_bot_temp (9)
    i_Aer_bot_pres (9)
    i_Aer_bot_relh (9)
    i_Surface_temp (4)
    i_Surface_pres (4)
    i_Surface_relh (4)
    i_Surface_wind (4)
    i_Surface_wdir (4)

GLA11

  • Changed record length to 3032
  • Created PDF for i_FRir_qaFlag and i_MRir_QAflag
  • Added description values for i_cld1_flag, i_aer4_flag, and i_pbl4_flag
  • Changed i_spare2 and added i_spare3 (144)
  • Also added the following new parameters:
    i_SolarAngle (4)
    i_MRg_cldtop_temp (10,4)
    i_MRg_cldtop_pres (10,4)
    i_MRg_cldtop_relh (10,4)
    i_MRg_cldbot_temp (10,4)
    i_MRg_cldbot_pres (10,4) i_MRg_cldbot_relh (10,4)
    i_Aer_top_temp (9)
    i_Aer_top_pres (9)
    i_Aer_top_relh (9)
    i_Aer_bot_temp (9)
    i_Aer_bot_pres (9)
    i_Aer_bot_relh (9)
    i_Aer_ir_top (2)
    i_Aer_ir_bot (2)
    i_Aer_ir_top_temp (2)
    i_Aer_ir_top_pres (2)
    i_Aer_ir_top_relh (2)
    i_Aer_ir_bot_temp (2)
    i_Aer_ir_bot_pres (2)
    i_Aer_ir_bot_relh (2)
    i_MRir_cld_top (10,4)
    i_MRir_cld_bot (10,4)
    i_MRir_cldtop_temp (10,4)
    i_MRir_cldtop_pres (10,4)
    i_MRir_cldtop_relh (10,4)
    i_MRir_cldbot_temp (10,4)
    i_MRir_cldbot_pres (10,4)
    i_MRir_cldbot_relh (10,4)
    i_MRir_QAflag (10,4)
    i_Aer_PBL_LR_temp
    i_Aer_PBL_LR_pres
    i_Aer_PBL_LR_relh
    i_Surface_temp (4)
    i_Surface_pres (4)
    i_Surface_relh (4)
    i_Surface_wind (4)
    i_Surface_wdir (4)
    i_Aer_ir_OD (2)
    i_cld_ir_OD (10,4)
    i_Aer_ir_ODFlg (2)
    i_cld_ir_ODFlg (10,4)
    i_FRir_ODFlg (160)
    i_FRir_qaFlag (160)
    i_FRir_cldtop (160)
    i_Aer_b20_prop (20,5)
    i_PBL_prop (20)

GLA12

  • Changed record length to 6600
  • Changed the description for i_ElvFlg and i_SurfRuf_slpQF
  • Changed definitions for i_CorrStatFlg
  • Changed i_spare6 and added i_spare7 (566)
  • Also added the following new parameters:
    i_DEM_hires_src (40)
    i_DEM_hires_elv (40)
    i_satNdx(40)
    i_satRngCorr(40)
    i_satCorrFlg(40)
    i_satNrgCorr(40)
    i_satPwdCorr(40)
    i_gval_rcv(40)
    i_RecNrgAll(40)
    i_FRir_cldtop(40)
    i_FRir_qaFlag(40)
    i_FRir_ODflg(40)
    i_FRir_intsig(40)
    i_msRngCorr (40)
    i_msCorrFlg (40)
    i_Surface_temp
    i_Surface_pres
    i_Surface_relh

GLA13

  • Changed record length to 6760
  • Changed the description for i_ElvFlg
  • Changed definitions for i_CorrStatFlg
  • Changed i_spare6 and added i_spare8 (566)
  • Also added the following new parameters:
    i_DEM_hires_src (40)
    i_DEM_hires_elv (40)
    i_satNdx(40)
    i_satRngCorr(40)
    i_satCorrFlg(40)
    i_satNrgCorr(40)
    i_satPwdCorr(40)
    i_gval_rcv(40)
    i_RecNrgAll(40)
    i_FRir_cldtop(40)
    i_FRir_qaFlag(40)
    i_FRir_ODflg(40)
    i_FRir_intsig(40)
    i_msRngCorr (40)
    i_msCorrFlg (40)
    i_Surface_temp
    i_Surface_pres
    i_Surface_relh

GLA14

  • Changed record length to 10000
  • Changed the description for i_ElvFlg and i_SurfRuf_slpQF
  • Changed definitions for i_CorrStatFlg
  • Added i_DEM_hires_src & i_DEM_hires_elv and a PDF created for i_DEM_hires_src (PDF fixed in a later release for the addition of GLA12 and GLA13)
  • Changed i_spare6 and added i_spare7 (566)
  • Also added the following new parameters:
    i_DEM_hires_src (40)
    i_DEM_hires_elv (40)
    i_satNdx(40)
    i_satRngCorr(40)
    i_satCorrFlg(40)
    i_satNrgCorr(40)
    i_satPwdCorr(40)
    i_gval_rcv(40)
    i_RecNrgAll(40)
    i_FRir_cldtop(40)
    i_FRir_qaFlag(40)
    i_FRir_ODflg(40)
    i_FRir_intsig(40)
    i_msRngCorr (40)
    i_msCorrFlg (40)
    i_Surface_temp
    i_Surface_pres
    i_Surface_relh

GLA15

  • Changed record length to 6280
  • Changed the description for i_ElvFlg
  • Changed definitions for i_CorrStatFlg
  • Changed i_spare6 and added i_spare7 (594)
  • Also added the following new parameters:
    i_satNdx(40)
    i_satRngCorr(40)
    i_satCorrFlg(40)
    i_satNrgCorr(40)
    i_satPwdCorr(40)
    i_gval_rcv(40)
    i_RecNrgAll(40)
    i_FRir_cldtop(40)
    i_FRir_qaFlag(40)
    i_FRir_ODflg(40)
    i_FRir_intsig(40)
    i_msRngCorr (40)
    i_msCorrFlg (40)
    i_Surface_temp
    i_Surface_pres
    i_Surface_relh
    i_Surface_wind
    i_Surface_wdir