Products & Algorithms

Standard Product & Algorithm

Ver.2 standard products have been released on 2020/06/29.
---Summary of Ver.2
  • The accuracy is improved
  • Product Changes
    • RSRF: Shortwave radiation (SWR) is added.
    • LAI: Change from Understory_NDVI to Overstory_LAI
    • SST: GHRSST required SD (data set) is added.
  • Others
    • several minor changes
  • (Note 1)
    • Version number of ALL products will be changed from "1xxx" to "2xxx".
    • G-Portal (FTP) directory for standard products will be changed from "1" to "2".
      The directory of near-realtime products is not changed (only the file name is changed).
      [Ver.1 example]
      /standard/GCOM-C/GCOM-C.SGLI/L2.ATMOS.CLFG/1/2020/01/05
      GC1SG1_20200105A01D_T0112_L2SG_CLFGK_1001.h5
      [Ver.2 example]
      /standard/GCOM-C/GCOM-C.SGLI/L2.ATMOS.CLFG/2/2020/01/05
      GC1SG1_20200105A01D_T0112_L2SG_CLFGK_2000.h5
  • (Note 2) (2020/06/11 Updated)
    1. Because of the process system change, statistics products (8D, 1M) with insufficient statistical period will be produced.
    2. L2 RSRF accuracy will be degraded for maximum 3 months because of the insufficient input data at the version transition.
    3. ALL land and atmosphere products will be affected by the RSRF accuracy because they use RSRF as an input.
    We apologize for the inconvinience.
  • (Note 3) (2020/07/28 Updated)
    1. Snow and Ice Physical Properties (SIPR) algorithm has the following restrictions.
      - In Snow grain size of shallow layer (SGSL) and Snow and ice surface temperature (SIST) products, the incorrect values are stored in QA_flag of some tiles, and the incorrect values are stored in the statistical product.
      - Level2 SIPR,
      - Level2 Tile statistics SIPR (SGSL, SIST)
      - Level3 (SGSL, SIST)
      Product version: Ver.2 (2000)

  • (Note 4)(2023/3/9 Updated)
    1. Half pixel shift in Level2 LTOA Q/K Tile product

      2. This bug has been already fixed by reprocessing the L2 LTOA (LTOA ver.2006~）

  • Please refer to here for reprocessing status.
Ver.3 standard products have been released on 2021/11/29.
---Summary of Ver.3
  • The accuracy is improved
    • In this Ver.3 release, all products are satisfied the standard accuracy.
  • Product Changes
    • Polarized reflectances (Rp_PL01, Rp_PL02) are added to the Image_data of RSRF product.
    • Snow and Ice Albedo (SALB) is added to Image_data of SIPR product.
    • Cosine_of_solor_incidence from slope normal is added to Geometry_data of VGI product.
    • Short wavelength radiation (SWR_) is added to RSRF tile statistics product.
    • Snow and Ice Albedo (SALB) is added to L2 Tile Statistics product.
    • The non-polarization aerosol algorithm and the polarization aerosol algorithm are merged as ARNP product.
      Ver.1-2: AeRosol by Non-Polarization -> Ver.3: AeRosol properties using Numerical Prediction
    • The physical dataset names changed in the L2 and L3 statistics products of ARNP (land and ocean data are merged into one dataset). In addition, error information (AROT_uncertainty, ARAE_uncertainty, ASSA_uncertaint) is added to Image_data of L2 ARNP product.
    • The L2 and L3 statistics products of ARPL are discontinued.
  • Others
    • Several minor changes
  • Note (Bug fix & Version history) is HERE
  • The reprocessing schedule is HERE。

Outline of the SGLI standard products is summarized in the table below. You can see each product detail with clicking the product name in the colomun of "Product ID" (You can download Algorithm Theoretical Basis Documents (ATBDs) and sample data). In addition, the definition of the data provided on G-Portal can be checked at the "Detail" bottun in "Category" column.

The map projected images (Japan area and global) of the standard products are provided at JASMES/SGLI Standard Monitor.

The map projected images (Japan area) of the near realtime products are provided at JASMES/SGLI Near-Realtime Monitor.

Category Product
[ID*1]		 Definition & Unit*2 Algorithm
ID		 Responsible
Person		 ATBD
(update date)
 Ver.1 update contents
Radiance Level-1A
[VNR/IRS/POL]
  • Def.: Sensor output (digital counts)
  • Unit: none
 G1 JAXA - -
Level-1B
[VNR/IRS/POL]
  • Def.: Calibrated radiance (granule scene or path data projected on reference coordinate)
  • Unit: W/m2/um/sr
 G1 JAXA - -
LTOA
(Tile)
  • Def.: Top of atmosphere (TOA) radiance
  • Unit: W/m2/um/sr
  • G2A
  • G2B
  • G2C
  • JAXA
  • Hashimoto
  • Takaku
 Ver.1 (Sep. 2020) -
LTOA
(Global)		 G3A H. Murakami Ver.1 (Oct. 2018)
Ver.3 (Oct. 2021)
 -
LCLR
(Global)
  • Def.: Top of atmosphere (TOA) radiance only for clear
  • Unit: W/m2/um/sr
 -
Land

Detail		 Atmospheric corrected reflectance
[RSRF]
  • Def.: Land surface reflectance corrected for the effects of atmospheric scattering and absorption. Correction of directional anisotropic effects are also made for 8-day and monthly composite products.
  • Unit: none
 T1A H. Murakami Ver.1 (Oct. 2018)
Ver.2 (Mar. 2020)
Ver.3 (Oct. 2021)
 -
Vegetation index
[VGI_(NDVI/EVI_)]
  • Def.: Indices indicating vegetation cover and activity such as NDVI and EVI
  • Unit: none
 T2A JAXA Ver.1 (Nov. 2018)
 -
Shadow index
[VGI_(SDI_)]
  • Def.: An index indicating shadow fraction of vegetation area inferred from spectral reflectance.
  • Unit: none
 M. Moriyama Ver.1 (Sep. 2014)
Ver.2 (May 2020) Ver.3 (Oct. 2021)
Above-ground biomass
[AGB_]
  • Def.: Dry weight of above-ground vegetation
  • Unit: t/ha
 T3A Y. Honda Ver.1 (Mar. 2015)
 -
Vegetation roughness index
[AGB_(VRI_)]
  • Def.: An index indicating plant vertical structure observed from multi-angle directions.
  • Unit: none
Fraction of absorbed PAR
[LAI_(FPAR)]
  • Def.: Fraction of photosynthetically active radiation absorbed by vegetation
  • Unit: none
 T2B T. Kobayashi Ver.1 (Nov. 2011)
Ver.2 (Jun. 2020)
Ver.3 (Oct. 2021)
 -
Leaf area index
[LAI_]
  • Def.: The sum of the one sided green leaf area per unit ground area.
  • Unit: none
Land surface temperature
[LST_]
  • Def.: Temperature of terrestrical land surface.
  • Unit: Kelvin
 T4A M. Moriyama Ver.1 (Sep. 2014)
Ver.2 (May 2020)
Ver.3 (Jun. 2021)
 -
Atmosphere

Detail		 Cloud flag
[CLFG]
  • Def.: Cloud discrimination flag including the classification of cloud type and phase (liquid/solid).
  • Unit: none
 A1ABC T. Nakajima Ver.1 (Jul. 2019)
Ver.3 (Oct. 2021)
 -
Classified cloud fraction
[CLPR(CFR*)]
* is the No. of the ISCCP classes
  • Def.: Cloud fractions for 9 cloud types which are classified based on the ISCCP classification rule.
  • Unit: %
 A2AB T. Nakajima Ver.1 (Sep. 2011)
 -
Cloud top temp/height
[CLPR(CLTT/CLTH)]
  • Def.: Temperature and height of cloud top layer.
  • Unit: Kelvin for temperature, km for height
Water cloud OT/effective radius
[CLPR(COTW/CERW)]
  • Def.: Optical thickness and effective radius of water cloud droplets
  • Unit: none for thickness, mm for radius
Ice cloud optical thickness
[CLPR(COTI)]
  • Def.: Optical thickness of ice cloud.
  • Unit: none
Aerosol over the ocean
[ARNP(AOTO/AAEO/ASSA)]
  • Def.: Optical thickness, Ångström exponent, and classification of aerosol over ocean estimated using visible and near infrared band.
  • Unit: none
 A3AB M. Yoshida Ver.1 (Jul. 2018)
Ver.2 (May. 2020) 		-
Land aerosol by near ultra violet
[ARNP(AOTL/AAEL/ASSA)]
  • Def.: Optical thickness and light absorption coefficient of aerosol over land estimated using near-ultraviolet band.
  • Unit: none
Aerosol by Polarization
[ARPL(AOTP/AAEP/ASSA)]
  • Def.: Optical thickness, Ångström exponent, and classification of aerosol estimated using polarization bands.
  • Unit: none
 A4AB I. Sano Ver.1 (Nov. 2018)
Ver.2 (2020) 		-
Ocean

Detail		 Normalized water leaving radiance
[NWLR(L***)]
*** is wavelength.
  • Def.: The upwelling radiance just above the sea surface.
  • Unit: W/m2/str/um or 1/sr
 O2AB M. Toratani Ver.1 (Jan. 2019)
Ver.2 (Jul. 2020)
Ver.3 (Oct. 2021)
 -
Atmospheric correction param
[NWLR(T***)]
*** is wavelength.
  • Def.: Aerosol optical properties for the atmospheric correction over ocean.
  • Unit: none
Photosynthetically available radiatioin
[NWLR(PAR_)]
  • Def.: Photon flux density within the visible wavelength range (400 to 700 nm) over ocean which is potencially available to plant for photosynthesis.
  • Unit: Ein/m2/day or mol photons/m2/day
 R. Frouin, H. Murakami Ver.1 (Oct. 2018)
Chlorophyll-a concentration
[IWPR(CHLA)]
  • Def.: Concentration of the green pigment in phytoplankton in surface water.
  • Unit: mg/m3
 O3AB H. Murakami Ver.1 (Oct. 2018)
Ver.2 (Jan. 2020) 		-
Suspended solid concentration
[IWPR(TSM_)]
  • Def.: Dry weight of suspended matter in a unit volume of surface water which is the sum of organics such as phytoplankton and inorganics such as soil.
  • Unit: g/m3
 M. Toratani Ver.1 (Oct. 2011)
Ver.2 (Jun. 2020)
Colored dissolved organic matter
[IWPR(CDOM)]
  • Def.: Light absoption coefficient of organics dissolved in surface water at 412nm.
  • Unit: 1/m
 T. Hirata Ver.1 (Mar. 2019)
Ver.2 (Mar. 2020)
IOP (Mar. 2019)
Sea surface temperature
[SSTD/SSTN(SST_)]
  • Def.: Temperature of sea surface.
  • Unit: deg.C)
 O1AB Y. Kurihara Ver.1 (Oct. 2018)
Ver.2 (Oct. 2018) 		-
Cryosphere

Detail		 Snow and Ice covered area
[SICE]
  • Def.: The extent of global snow and ice cover.
  • Unit: none
 C1AB K. Stamnes Ver.1 (Mar. 2016)
Ver.2 (May. 2020) 		-
Okhotsk sea-ice distribution
[OKID]
  • Def.: The extent of sea ice in Okhotsk Sea.
  • Unit: none
 C1C K. Stamnes Ver.1 (Mar. 2016)
Ver.2 (May. 2020) 		-
Snow and ice surface Temperature
[SIPR(SIST)]
  • Def.: Temperature of snow and ice surface.
  • Unit: Kelvin
 C2AB K. Stamnes Ver.1 (Mar. 2016)
Ver.2 (May. 2020) 		-
Snow grain size of shallow layer
[SIPR(SGSL)]
  • Def.: Grain size of snow ice particle in shallow layer derived mainly from SGLI 865nm band reflectance.
  • Unit: μm
Statistics Level-2 Tile Statistics
  • Def.: Temporal statistics of SGLI Level-2 (L2) Tile geophysical variable (GV) products for land and cryosphere.
  • Unit: Same as the L2 variables
 G4A M. Hori Ver.1 (Mar. 2017) -
LTOA Title Mosaic
  • Def.: Cloud-free Top of atmosphere (TOA) radiance data from Level-2 Tile LTOA (TOA radiance) product.
  • Unit: Same as the L2 variables
 G4B M. Hori Ver.1 (Mar. 2017) -
RSRF Tile Statistics
  • Def.: Temporal statistics of the Atmospheric corrected reflectance (RSRF) with the correction of directional dependence.
  • Unit: none
 G4C H. Murakami Ver.1 (Oct. 2018)
Ver.2 (Mar. 2020) Ver.3 (Oct. 2021)
 -
Level-3 Global Spatial Binning
  • Def.: Spatial statistics of SGLI Level-2 (L2) daily geophysical variable (GV) products reducing the spatial resolution to 1/24 deg. resolution (land, cryosphere, and ocean) or 1/12 deg. resolution (atmosphere).
  • Unit: Same as the L2 variables
 G5A M. Hori Ver.1 (Mar. 2017)
 -
Level-3 Global Temporal Binning
  • Def.: Temporal statistics of SGLI Level-3 (L3) spatially-binned geophysical variable (GV) products.
  • Unit: Same as the L2 variables
 G6A M. Hori Ver.1 (Mar. 2017)
 -
Level-3 Global Map
  • Def.: Map-projected images of the SGLI Level-3 (L3) spatially- or temporally- binned geophysical variable (GV) products.
  • Unit: Same as the L2 variables
 G7A M. Hori Ver.1 (Mar. 2017)
 -
Category Product
[ID*1]		 Definition & Unit*2 Algorithm
ID		 Responsible
Person		 ATBD
(update date)
 Ver.2 update contents
Radiance Level-1A
[VNR/IRS/POL]
  • Def.: Sensor output (digital counts)
  • Unit: none
 G1 JAXA - ・Improved accuracy
Level-1B
[VNR/IRS/POL]
  • Def.: Calibrated radiance (granule scene or path data projected on reference coordinate)
  • Unit: W/m2/um/sr
 G1 JAXA - ・Improved accuracy
LTOA
(Tile)
  • Def.: Top of atmosphere (TOA) radiance
  • Unit: W/m2/um/sr
  • G2A
  • G2B
  • G2C
  • JAXA
  • Hashimoto
  • Takaku
 Ver.1 (Sep. 2020) ・Bug fixed
LTOA
(Global)		 G3A H. Murakami Ver.1 (Oct. 2018)
Ver.3 (Oct. 2021)
 ・Bug fixed
LCLR
(Global)
  • Def.: Top of atmosphere (TOA) radiance only for clear
  • Unit: W/m2/um/sr
 ・Bug fixed
Land

Detail		 Atmospheric corrected reflectance
[RSRF]
  • Def.: Land surface reflectance corrected for the effects of atmospheric scattering and absorption. Correction of directional anisotropic effects are also made for 8-day and monthly composite products.
  • Unit: none
 T1A H. Murakami Ver.1 (Oct. 2018)
Ver.2 (Mar. 2020)
Ver.3 (Oct. 2021)
  • ・Added SD array(/image_data/SWR)
  • ・Applied the vicarious calibration results of Ver. 2
  • ・Improved of the quality check, cloud identification and BRDF calculation
  • ・Modified QA_flag
    		•
    Vegetation index
    [VGI_(NDVI/EVI_)]
    • Def.: Indices indicating vegetation cover and activity such as NDVI and EVI
    • Unit: none
    		 T2A JAXA Ver.1 (Nov. 2018)
  • ・Modified the parameter of shadow index calculation
  • ・Modified QA_flag
    		•
    Shadow index
    [VGI_(SDI_)]
    • Def.: An index indicating shadow fraction of vegetation area inferred from spectral reflectance.
    • Unit: none
    		 M. Moriyama Ver.1 (Sep. 2014)
    Ver.2 (May 2020) Ver.3 (Oct. 2021)
    Above-ground biomass
    [AGB_]
    • Def.: Dry weight of above-ground vegetation
    • Unit: t/ha
    		 T3A Y. Honda Ver.1 (Mar. 2015)
  • ・Improved the algorithm and the period of input data (RSRF)
  • ・Modified QA_flag
    		•
    Vegetation roughness index
    [AGB_(VRI_)]
    • Def.: An index indicating plant vertical structure observed from multi-angle directions.
    • Unit: none
    Fraction of absorbed PAR
    [LAI_(FPAR)]
    • Def.: Fraction of photosynthetically active radiation absorbed by vegetation
    • Unit: none
    		 T2B T. Kobayashi Ver.1 (Nov. 2011)
    Ver.2 (Jun. 2020)
    Ver.3 (Oct. 2021)
  • ・Improved the algorithm and LUT
  • ・Modified the SD array (Image_data/Understory_NDVI --->>> Image_data/Overstory_LAI)
  • ・Modified QA_flag
    		•
    Leaf area index
    [LAI_]
    • Def.: The sum of the one sided green leaf area per unit ground area.
    • Unit: none
    Land surface temperature
    [LST_]
    • Def.: Temperature of terrestrical land surface.
    • Unit: Kelvin
    		 T4A M. Moriyama Ver.1 (Sep. 2014)
    Ver.2 (May 2020)
    Ver.3 (Jun. 2021)
  • ・Added input data(CLFG)
  • ・Modified QA_flag
  • ・Modified input function of meteorological data
    		•
    Atmosphere

    Detail    		 Cloud flag
    [CLFG]
    • Def.: Cloud discrimination flag including the classification of cloud type and phase (liquid/solid).
    • Unit: none
    		 A1ABC T. Nakajima Ver.1 (Jul. 2019)
    Ver.3 (Oct. 2021)
    ・Not changed (Major version is updated to Ver.2)
    Classified cloud fraction
    [CLPR(CFR*)]
    * is the No. of the ISCCP classes
    • Def.: Cloud fractions for 9 cloud types which are classified based on the ISCCP classification rule.
    • Unit: %
    		 A2AB T. Nakajima Ver.1 (Sep. 2011)
    		 ・Not changed (Major version is updated to Ver.2)
    Cloud top temp/height
    [CLPR(CLTT/CLTH)]
    • Def.: Temperature and height of cloud top layer.
    • Unit: Kelvin for temperature, km for height
    Water cloud OT/effective radius
    [CLPR(COTW/CERW)]
    • Def.: Optical thickness and effective radius of water cloud droplets
    • Unit: none for thickness, mm for radius
    Ice cloud optical thickness
    [CLPR(COTI)]
    • Def.: Optical thickness of ice cloud.
    • Unit: none
    Aerosol over the ocean
    [ARNP(AOTO/AAEO/ASSA)]
    • Def.: Optical thickness, Ångström exponent, and classification of aerosol over ocean estimated using visible and near infrared band.
    • Unit: none
    		 A3AB M. Yoshida Ver.1 (Jul. 2018)
    Ver.2 (May. 2020)     		・Added auxiliary data (Himawari aerosol assimilation model data)
    Land aerosol by near ultra violet
    [ARNP(AOTL/AAEL/ASSA)]
    • Def.: Optical thickness and light absorption coefficient of aerosol over land estimated using near-ultraviolet band.
    • Unit: none
    Aerosol by Polarization
    [ARPL(AOTP/AAEP/ASSA)]
    • Def.: Optical thickness, Ångström exponent, and classification of aerosol estimated using polarization bands.
    • Unit: none
    		 A4AB I. Sano Ver.1 (Nov. 2018)
    Ver.2 (2020)
  • ・Improved the cloud identification using by polarization band
  • ・Improved the snow/ice identification
  • ・Modified QA_flag
    		•
    Ocean

    Detail    		 Normalized water leaving radiance
    [NWLR(L***)]
    *** is wavelength.
    • Def.: The upwelling radiance just above the sea surface.
    • Unit: W/m2/str/um or 1/sr
    		 O2AB M. Toratani Ver.1 (Jan. 2019)
    Ver.2 (Jul. 2020)
    Ver.3 (Oct. 2021)
  • ・Improved LUT of aerosol
  • ・Improved sunglint correction
  • ・Improved in-water model
  • ・Modified QA_flag
  • ・Applied the vicarious calibration results of Ver.2
    		•
    Atmospheric correction param
    [NWLR(T***)]
    *** is wavelength.
    • Def.: Aerosol optical properties for the atmospheric correction over ocean.
    • Unit: none
    Photosynthetically available radiatioin
    [NWLR(PAR_)]
    • Def.: Photon flux density within the visible wavelength range (400 to 700 nm) over ocean which is potencially available to plant for photosynthesis.
    • Unit: Ein/m2/day or mol photons/m2/day
    		 R. Frouin, H. Murakami Ver.1 (Oct. 2018)
    Chlorophyll-a concentration
    [IWPR(CHLA)]
    • Def.: Concentration of the green pigment in phytoplankton in surface water.
    • Unit: mg/m3
    		 O3AB H. Murakami Ver.1 (Oct. 2018)
    Ver.2 (Jan. 2020)
  • ・Improved the algorithm of CDOM and TSM
  • ・Modified QA_flag
    		•
    Suspended solid concentration
    [IWPR(TSM_)]
    • Def.: Dry weight of suspended matter in a unit volume of surface water which is the sum of organics such as phytoplankton and inorganics such as soil.
    • Unit: g/m3
    		 M. Toratani Ver.1 (Oct. 2011)
    Ver.2 (Jun. 2020)
    Colored dissolved organic matter
    [IWPR(CDOM)]
    • Def.: Light absoption coefficient of organics dissolved in surface water at 412nm.
    • Unit: 1/m
    		 T. Hirata Ver.1 (Mar. 2019)
    Ver.2 (Mar. 2020)
    IOP (Mar. 2019)
    Sea surface temperature
    [SSTD/SSTN(SST_)]
    • Def.: Temperature of sea surface.
    • Unit: deg.C)
    		 O1AB Y. Kurihara Ver.1 (Oct. 2018)
    Ver.2 (Oct. 2018)
  • ・Added auxiliary data (Himawari SST data)
  • ・Added SD array (/Image_data/Cloud_probability)
  • ・Improved the cloud identification （Improved cloud mask of coast and inland water area）
  • ・Modified the probability density function of cloud mask
  • ・Modified QA_flag
    		•
    Cryosphere

    Detail    		 Snow and Ice covered area
    [SICE]
    • Def.: The extent of global snow and ice cover.
    • Unit: none
    		 C1AB K. Stamnes Ver.1 (Mar. 2016)
    Ver.2 (May. 2020)
  • ・Improved algorithm of cloud identification
    		•
    Okhotsk sea-ice distribution
    [OKID]
    • Def.: The extent of sea ice in Okhotsk Sea.
    • Unit: none
    		 C1C K. Stamnes Ver.1 (Mar. 2016)
    Ver.2 (May. 2020)
  • ・Improved algorithm of cloud identification
    		•
    Snow and ice surface Temperature
    [SIPR(SIST)]
    • Def.: Temperature of snow and ice surface.
    • Unit: Kelvin
    		 C2AB K. Stamnes Ver.1 (Mar. 2016)
    Ver.2 (May. 2020)
  • ・Improved algorithm for solving snow particle size
  • ・Update table of emissivity
    		•
    Snow grain size of shallow layer
    [SIPR(SGSL)]
    • Def.: Grain size of snow ice particle in shallow layer derived mainly from SGLI 865nm band reflectance.
    • Unit: μm
    Statistics Level-2 Tile Statistics
    • Def.: Temporal statistics of SGLI Level-2 (L2) Tile geophysical variable (GV) products for land and cryosphere.
    • Unit: Same as the L2 variables
    		 G4A M. Hori Ver.1 (Mar. 2017) ・Bug fixed
    LTOA Title Mosaic
    • Def.: Cloud-free Top of atmosphere (TOA) radiance data from Level-2 Tile LTOA (TOA radiance) product.
    • Unit: Same as the L2 variables
    		 G4B M. Hori Ver.1 (Mar. 2017)
  • ・Bug fix
  • ・Modified QA_flag
    		•
    RSRF Tile Statistics
    • Def.: Temporal statistics of the Atmospheric corrected reflectance (RSRF) with the correction of directional dependence.
    • Unit: none
    		 G4C H. Murakami Ver.1 (Oct. 2018)
    Ver.2 (Mar. 2020) Ver.3 (Oct. 2021)
  • ・Bug fix
  • ・Changed the data uesed for calculation of BRDF
    		•
    Level-3 Global Spatial Binning
    • Def.: Spatial statistics of SGLI Level-2 (L2) daily geophysical variable (GV) products reducing the spatial resolution to 1/24 deg. resolution (land, cryosphere, and ocean) or 1/12 deg. resolution (atmosphere).
    • Unit: Same as the L2 variables
    		 G5A M. Hori Ver.1 (Mar. 2017)
    		 ・Bug fixed
    Level-3 Global Temporal Binning
    • Def.: Temporal statistics of SGLI Level-3 (L3) spatially-binned geophysical variable (GV) products.
    • Unit: Same as the L2 variables
    		 G6A M. Hori Ver.1 (Mar. 2017)
    		 ・Bug fixed
    Level-3 Global Map
    • Def.: Map-projected images of the SGLI Level-3 (L3) spatially- or temporally- binned geophysical variable (GV) products.
    • Unit: Same as the L2 variables
    		 G7A M. Hori Ver.1 (Mar. 2017)
    		 ・Bug fixed
    Category Product
    [ID*1]    		 Definition & Unit*2 Algorithm
    ID    		 Responsible
    Person    		 ATBD
    (update date)
    		 Ver.3 update contents
    Radiance Level-1A
    [VNR/IRS/POL]
    • Def.: Sensor output (digital counts)
    • Unit: none
    		 G1 JAXA - ・Not changed
    (Major version is continued as Ver.2. Minor version is updated.)
    Level-1B
    [VNR/IRS/POL]
    • Def.: Calibrated radiance (granule scene or path data projected on reference coordinate)
    • Unit: W/m2/um/sr
    		 G1 JAXA - ・Not changed
    (Major version is continued as Ver.2. Minor version is updated.)
    LTOA
    (Tile)
    • Def.: Top of atmosphere (TOA) radiance
    • Unit: W/m2/um/sr
    • G2A
    • G2B
    • G2C
    • JAXA
    • Hashimoto
    • Takaku
    		 Ver.1 (Sep. 2020) ・Not changed
    (Major version is continued as Ver.2. Minor version is updated.)
    LTOA
    (Global)    		 G3A H. Murakami Ver.1 (Oct. 2018)
    Ver.3 (Oct. 2021)
    		 ・Modified pixel selection method
    LCLR
    (Global)
    • Def.: Top of atmosphere (TOA) radiance only for clear
    • Unit: W/m2/um/sr
    		 ・Modified pixel selection method (Heavy aerosol flag of CLFG is used as clear sky)
    Land

    Detail    		 Atmospheric corrected reflectance
    [RSRF]
    • Def.: Land surface reflectance corrected for the effects of atmospheric scattering and absorption. Correction of directional anisotropic effects are also made for 8-day and monthly composite products.
    • Unit: none
    		 T1A H. Murakami Ver.1 (Oct. 2018)
    Ver.2 (Mar. 2020)
    Ver.3 (Oct. 2021)
    		 ・Modified coefficients of cloud, discrimination of shadow, and surface reflectance.
    ・Added polarized reflectances (Rp_PL01, Rp_PL02) to Image_data.
    ・Added limit of target procession days
    ・Changed Error_DN of QA_flag to "1" in order to match with bit0=1(no data)
    Vegetation index
    [VGI_(NDVI/EVI_)]
    • Def.: Indices indicating vegetation cover and activity such as NDVI and EVI
    • Unit: none
    		 T2A JAXA Ver.1 (Nov. 2018)
    		 ・Added Cosine_of_solar_incidence from slope normal to Geometry_data
    ・Modified QA_flag
    ・Modified SDI calculation parameters
    Shadow index
    [VGI_(SDI_)]
    • Def.: An index indicating shadow fraction of vegetation area inferred from spectral reflectance.
    • Unit: none
    		 M. Moriyama Ver.1 (Sep. 2014)
    Ver.2 (May 2020) Ver.3 (Oct. 2021)
    Above-ground biomass
    [AGB_]
    • Def.: Dry weight of above-ground vegetation
    • Unit: t/ha
    		 T3A Y. Honda Ver.1 (Mar. 2015)
    		 ・Updated LUT with using satellite vegetation LIDAR "GEDI"
    Vegetation roughness index
    [AGB_(VRI_)]
    • Def.: An index indicating plant vertical structure observed from multi-angle directions.
    • Unit: none
    Fraction of absorbed PAR
    [LAI_(FPAR)]
    • Def.: Fraction of photosynthetically active radiation absorbed by vegetation
    • Unit: none
    		 T2B T. Kobayashi Ver.1 (Nov. 2011)
    Ver.2 (Jun. 2020)
    Ver.3 (Oct. 2021)
    		 ・Modified estimation algorithm, LUT, and parameters
    ・Changed input data (previous RSRFQ data are not used)
    ・Changed base map to SGLI forest structure map
    ・Modified QA_flag
    ・Modified Mask_for_statistics
    Leaf area index
    [LAI_]
    • Def.: The sum of the one sided green leaf area per unit ground area.
    • Unit: none
    Land surface temperature
    [LST_]
    • Def.: Temperature of terrestrical land surface.
    • Unit: Kelvin
    		 T4A M. Moriyama Ver.1 (Sep. 2014)
    Ver.2 (May 2020)
    Ver.3 (Jun. 2021)
    		 ・Modified cloud screening level using QA_flag
    ・Modified QA_flag (Error_DN)
    ・Modified Mask_for_statistics
    Atmosphere

    Detail    		 Cloud flag
    [CLFG]
    • Def.: Cloud discrimination flag including the classification of cloud type and phase (liquid/solid).
    • Unit: none
    		 A1ABC T. Nakajima Ver.1 (Jul. 2019)
    Ver.3 (Oct. 2021)
    		 ・Improved classification accuracy of cloud, snow, and heavy aerosol by deep nural detwork method.
    ・Modified Error_DN, Maximum_valid_DN, and Minimum_valid_DN
    Classified cloud fraction
    [CLPR(CFR*)]
    * is the No. of the ISCCP classes
    • Def.: Cloud fractions for 9 cloud types which are classified based on the ISCCP classification rule.
    • Unit: %
    		 A2AB T. Nakajima Ver.1 (Sep. 2011)
    		 ・Not changed
    (Major version is updated to Ver.3）
    Cloud top temp/height
    [CLPR(CLTT/CLTH)]
    • Def.: Temperature and height of cloud top layer.
    • Unit: Kelvin for temperature, km for height
    Water cloud OT/effective radius
    [CLPR(COTW/CERW)]
    • Def.: Optical thickness and effective radius of water cloud droplets
    • Unit: none for thickness, mm for radius
    Ice cloud optical thickness
    [CLPR(COTI)]
    • Def.: Optical thickness of ice cloud.
    • Unit: none
    Aerosol properties using numerical prediction
    [ARNP(AROT/ARAE/ASSA)]
    • Def: Optical thickness (τ), Ångström index and single scattering albedo over land of aerosols over land and ocean estimated using visible and near-infrared reflectance and polarization observations.
    • Unit: none
    		 A3AB M. Yoshida Ver.1 (Jul. 2018)
    Ver.2 (May. 2020) Ver.3 (Nov. 2021)     		・Merged land and ocean data
    ・Merged polarized and non-polarized algorithm
    ・Added error information for each dataset
    Ocean

    Detail    		 Normalized water leaving radiance
    [NWLR(L***)]
    *** is wavelength.
    • Def.: The upwelling radiance just above the sea surface.
    • Unit: W/m2/str/um or 1/sr
    		 O2AB M. Toratani Ver.1 (Jan. 2019)
    Ver.2 (Jul. 2020)
    Ver.3 (Oct. 2021)
    		 ・Modified aerosol LUT
    ・Modified estimation method of near-infrared reflectance in water（ρw）
    ・Modified QA_flag
    ・Modified Mask_for_statistics
    ・Modified vicarious calibration parameters
    ・Added correction form negative NWLR
    ・Added correction function for TAUA_670, TAUA_865
    Atmospheric correction param
    [NWLR(T***)]
    *** is wavelength.
    • Def.: Aerosol optical properties for the atmospheric correction over ocean.
    • Unit: none
    Photosynthetically available radiatioin
    [NWLR(PAR_)]
    • Def.: Photon flux density within the visible wavelength range (400 to 700 nm) over ocean which is potencially available to plant for photosynthesis.
    • Unit: Ein/m2/day or mol photons/m2/day
    		 R. Frouin, H. Murakami Ver.1 (Oct. 2018)
    Chlorophyll-a concentration
    [IWPR(CHLA)]
    • Def.: Concentration of the green pigment in phytoplankton in surface water.
    • Unit: mg/m3
    		 O3AB H. Murakami Ver.1 (Oct. 2018)
    Ver.2 (Jan. 2020)     		・Modified QA_flag
    ・Modified Mask_for_statistics
    Suspended solid concentration
    [IWPR(TSM_)]
    • Def.: Dry weight of suspended matter in a unit volume of surface water which is the sum of organics such as phytoplankton and inorganics such as soil.
    • Unit: g/m3
    		 M. Toratani Ver.1 (Oct. 2011)
    Ver.2 (Jun. 2020)
    Colored dissolved organic matter
    [IWPR(CDOM)]
    • Def.: Light absoption coefficient of organics dissolved in surface water at 412nm.
    • Unit: 1/m
    		 T. Hirata Ver.1 (Mar. 2019)
    Ver.2 (Mar. 2020)
    IOP (Mar. 2019)
    Sea surface temperature
    [SSTD/SSTN(SST_)]
    • Def.: Temperature of sea surface.
    • Unit: deg.C)
    		 O1AB Y. Kurihara Ver.1 (Oct. 2018)
    Ver.2 (Oct. 2018) Ver.3 (Oct. 2021)     		・Improved atmospheric correction method for SST estimation
    ・Modified cloud mask process
    ・Added L1B filtering process to remove stripe noise
    ・Modified Mask_for_statistics
    Cryosphere

    Detail    		 Snow and Ice covered area
    [SICE]
    • Def.: The extent of global snow and ice cover.
    • Unit: none
    		 C1AB K. Stamnes Ver.1 (Mar. 2016)
    Ver.2 (May. 2020)     		・Updated training dataset
    Okhotsk sea-ice distribution
    [OKID]
    • Def.: The extent of sea ice in Okhotsk Sea.
    • Unit: none
    		 C1C K. Stamnes Ver.1 (Mar. 2016)
    Ver.2 (May. 2020)     		・Updated training dataset
    Snow and ice surface Temperature
    [SIPR(SIST)]
    • Def.: Temperature of snow and ice surface.
    • Unit: Kelvin
    		 C2AB K. Stamnes Ver.1 (Mar. 2016)
    Ver.2 (May. 2020)     		・Updated training dataset
    ・Added snow and ice blue-sky albedo (SALB）to Image_data
    ・Modified Mask_for_statistics
    Snow grain size of shallow layer
    [SIPR(SGSL)]
    • Def.: Grain size of snow ice particle in shallow layer derived mainly from SGLI 865nm band reflectance.
    • Unit: μm
    Snow and ice blue-sky albedo
    [SIPR(SALB)]
    • Def：Snow and ice albedo for clear sky.
    • Unit: μm
    Statistics Level-2 Tile Statistics
    • Def.: Temporal statistics of SGLI Level-2 (L2) Tile geophysical variable (GV) products for land and cryosphere.
    • Unit: Same as the L2 variables
    		 G4A M. Hori Ver.1 (Mar. 2017) ・Added snow and ice blue-sky albedo (SALB）
    LTOA Title Mosaic
    • Def.: Cloud-free Top of atmosphere (TOA) radiance data from Level-2 Tile LTOA (TOA radiance) product.
    • Unit: Same as the L2 variables
    		 G4B M. Hori Ver.1 (Mar. 2017) ・Not changed
    （Major version is continued as Ver.2. Minor version is updated.）
    RSRF Tile Statistics
    • Def.: Temporal statistics of the Atmospheric corrected reflectance (RSRF) with the correction of directional dependence.
    • Unit: none
    		 G4C H. Murakami Ver.1 (Oct. 2018)
    Ver.2 (Mar. 2020) Ver.3 (Oct. 2021)
  • ・Added short wave radiation dataset (SWR_)
  • ・Modified weight for BRDF estimation
    		•
    Level-3 Global Spatial Binning
    • Def.: Spatial statistics of SGLI Level-2 (L2) daily geophysical variable (GV) products reducing the spatial resolution to 1/24 deg. resolution (land, cryosphere, and ocean) or 1/12 deg. resolution (atmosphere).
    • Unit: Same as the L2 variables
    		 G5A M. Hori Ver.1 (Mar. 2017)
    		 ・Abolished ARPL output due to integrating with ARNP
    ・Merged land and ocean data, and changed output dataset name (ARNP)
    Level-3 Global Temporal Binning
    • Def.: Temporal statistics of SGLI Level-3 (L3) spatially-binned geophysical variable (GV) products.
    • Unit: Same as the L2 variables
    		 G6A M. Hori Ver.1 (Mar. 2017)
    		 ・Abolished ARPL output due to integrating with ARNP
    ・Merged land and ocean data, and changed output dataset name (ARNP)
    Level-3 Global Map
    • Def.: Map-projected images of the SGLI Level-3 (L3) spatially- or temporally- binned geophysical variable (GV) products.
    • Unit: Same as the L2 variables
    		 G7A M. Hori Ver.1 (Mar. 2017)
    		 ・Abolished ARPL output due to integrating with ARNP
    ・Merged land and ocean data, and changed output dataset name (ARNP)

    *1:The product ID of Level-2 product is described in［ ], the product ID of Level-3 is described in ( ).

    *2:The method of map projection for each product is decribed in HERE.