Products & Algorithms

Standard Product & Algorithm

SGLI standard products were updated on June 29, 2020.
Please refer to here to the detail information for ver.2 product.

Outline of the SGLI standard products is summarized in the table shown below. You can download Algorithm Theoretical Basis Documents (ATBDs) and sample data.

You can also view map-projected images of SGLI near real-time observation data around Japan at the SGLI Near-Realtime monitor web (SGLI-NRT). Target products of SGLI-NRT are Sea Surface Temperature (SST), Chlorophyll-a (CHLA), Photosynthetically available radiation (PAR), Aerosol Optical Thickness (TAUA), Snow and Ice covered distribution (OKID), RGB of TOA radiance, and RGB of NWLR.

Area Product[ID*1] Definition & Unit Algorithm
ID
Responsible
Person
ATBD,
Validation results
(Update date)
Sample data*2
(HDF5 Format)
Difference image
Left:Ver.1, Right:Ver.2
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, Global)
  • Def.: Top-of-atmosphere (TOA) radiance
  • Unit: W/m2/um/sr
  • G2A
  • G2B
  • G2C
  • JAXA
  • Hashimoto
  • Takaku
Ver.1 (Sep. 2020) Ver.1(250m)
Ver.1(1/24deg)
Ver.1(1/24deg)
Ver.2(250m)
Ver.2(1/24deg)
Ver.2(1/24deg)
[Tile]
VN11
PI_0
SW03
TI01
[Global]
VN11
PI_0
SW03
TI01

G3A Murakami Ver.1 (Oct. 2018)
LCLR
(Tile, Global)
  • Def.: Top-of atmosphere (TOA) radiance only for clear
  • Unit: W/m2/um/sr
[Global]
VN11
P1_0
SW03
TI01
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.1(250m)
Ver.2(250m)
VN11
PI01
SW03
TI01
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)
Ver.1(250m)
Ver.2(250m)
EVI_
NDVI
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.1(250m)
Ver.2(250m)
SDI_
Above-ground biomass
[AGB_]
  • Def.: Dry weight of above-ground vegetation
  • Unit: t/ha
T3A K.Kajiwara Ver.1 (Mar. 2015)
Ver.1(1km)
Ver.2(1km)
AGB_
VRI_
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 Y.Honda Ver.1 (Nov. 2011)
Ver.2 (Jun. 2020)
Ver.1(250m)
Ver.2(250m)
FAPAR
LAI_
Overstory_LAI_
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.1(250m)
Ver.2(250m)
E01_
E02_
LST_
Atmosphere

Detail
Cloud flag/Classification
[CLFG]
  • Def.: Cloud discrimination flag including the classification of cloud type and phase (liquid/solid).
  • Unit: none
A1ABC T.Y. Nakajima Ver.1 (Jul. 2019)
Ver.1(1km)
Ver.1(250m)
Ver.2(1km)
Ver.2(250m)
Cloud_flag
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: percent
A2AB T.Y. Nakajima Ver.1 (Sep. 2011)
Ver.1(1km)
Ver.2(1km)
CLER_I
CLER_W
CLOT_I
CLOT_W
CLTH
CLTT
CLTYPE
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)]
  • 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)
Ver.1(1km)
Ver.2(1km)
ARAE_land
ARAE_ocean
AROT_land
AROT_ocean
ARSSA_land
Land aerosol by near ultra violet
[ARNP (AOTL/AAEL)]
  • 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)
Ver.1(1km)
Ver.2(1km)
ARAE_pol
AROT_pol
ARSSA_pol
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.1(1km)
Ver.1(250m)
Ver.2(1km)
Ver.2(250m)
NWLR_530
PAR
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
H. Murakami Ver.1 (Oct. 2018)
Chlorophyll-a concentration
[IWPR (CHLA)]
  • Def.: Concentration of the green pigment in phytoplankton in sea surface layer.
  • Unit: mg/m3
O3AB H. Murakami Ver.1 (Oct. 2018)
Ver.2 (Jan. 2020)
Ver.1(1km)
Ver.1(250m)
Ver.2(1km)
Ver.2(250m)
CDOM
CHLA
TSM
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.1(1km)
Ver.1(250m)
Ver.2(1km)
Ver.2(250m)
SST
Cloud_probability
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)
Ver.1(1km)
Ver.1(250m)
Ver.2(1km)
Ver.2(250m)
SICE
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)
Ver.1(250m)
Ver.2(250m)
SICE
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)
Ver.1(1km)
Ver.1(250m)
Ver.2(1km)
Ver.2(250m)
SGSL
SIST
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) Ver.1(NDVI,250m)
Ver.1(SIST,1km)
Ver.2(NDVI,250m)
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) Ver.1(250m)
Ver.2(250m)
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.1(RV01,250m)
Ver.1(RV02,250m)
Ver.1(RV03,250m)
Ver.1(RV04,250m)
Ver.1(RV05,250m)
Ver.1(RV06,250m)
Ver.1(RV07,250m)
Ver.1(RV08,250m)
Ver.1(RV09,250m)
Ver.1(RV10,250m)
Ver.1(RV11,250m)
Ver.1(RS01,1km)
Ver.1(RS02,1km)
Ver.1(RS03,250m)
Ver.1(RS04,1km)
Ver.1(RT01,250m)
Ver.1(RT02,250m)
Ver.1(RN08,1km)
Ver.1(RN11,1km)
Ver.1(RP01,1km)
Ver.1(RP02,1km)
Ver.1(GEOI,250m)
Ver.1(GEOP,1km)
Ver.1(GEOV,250m)
Ver.2(RV01,250m)
Ver.2(RV02,250m)
Ver.2(RV03,250m)
Ver.2(RV04,250m)
Ver.2(RV05,250m)
Ver.2(RV06,250m)
Ver.2(RV07,250m)
Ver.2(RV08,250m)
Ver.2(RV09,250m)
Ver.2(RV10,250m)
Ver.2(RV11,250m)
Ver.2(RS01,1km)
Ver.2(RS02,1km)
Ver.2(RS03,250m)
Ver.2(RS04,1km)
Ver.2(RT01,250m)
Ver.2(RT02,250m)
Ver.2(RN08,1km)
Ver.2(RN11,1km)
Ver.2(RP01,1km)
Ver.2(RP02,1km)
Ver.2(GEOI,250m)
Ver.2(GEOP,1km)
Ver.2(GEOV,250m)
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)
Ver.1(NDVI,1/24deg)
Ver.1(SIST,1/24deg)
Ver.1(SST,1/24deg)
Ver.2(NDVI,1/24deg)
Ver.2(SIST,1/24deg)
Ver.2(SST,1/24deg)
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)
Ver.1(SIST,1/24deg)
Ver.1(SST,1/24deg)
Ver.2(SIST,1/24deg)
Ver.2(SST,1/24deg)
Ver.2(NDVI,1/24deg)
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)
Ver.1(NDVI,1/24deg)
Ver.1(SST,1/24deg)
Ver.1(SIST,
1/24deg,EQR)

Ver.1(SIST,
1/24deg,PS-N)

Ver.2(NDVI,1/24deg)
Ver.2(SST,1/24deg)
Ver.2(SIST,
1/24deg,EQR)

Ver.2(SIST,
1/24deg,PS-N)

Ver.2(SIST,
1/24deg,PS-S)

*1:Product ID of Leve-2 product is written in [ ] and Level-3 is written in ( ).

*2:By clicking the link in the sample data column, you can download sample data that file format is HDF5. Also, you can view the difference image of Ver.1 and Ver.2 from sample the link in the column of difference. These are samples for checking data format. Accuracies of the physical variables are still under evaluation. Please refer to here for the map projection of each product.