Products & Algorithms

Accuracy Targets: Standard Products

Area group Product Day/night Grid size Release threshold*1 Standard accuracy*1 Target accuracy*1
Common radiance TOA radiance (including system geometric correction) TIR and land 2.2mm: both VNR,SWI
Land/coast: 250m,
offshore: 1km,
Radiometric 5% (absolute)*2 VNR,SWI:5% (absolute),1% (absolute)*2

TIR: 0.5K (@300K)
VNR,SWI: 3% (absolute), 0.5% (relative)*2

TIR: 0.5K (@300K)
Other VNR,SWI: daytime (+special operation) TIR Land/coast : 500m,
offshore : 1km
Geometric <1pixel Geometric <0.5pixel Geometric <0.3pixel
Land Surface reflectance Precise geometric correction both 250m <1pixel <0.5pixel <0.25pixel
Atmospheric corrected reflectance Daytime 250m 0.3(<=443nm), 0.1(<=443nm), 0.05(<=443nm),
0.2(>443nm)(scene)*L1 0.05(>443nm)(scene)*L1 0.025(>443nm)(scene)*L1
Vegetation and carbon cycle Vegetation index 250m Grass:25% (scene), forest:20% (scene) Grass:20% (scene), forest:15% (scene) Grass:10% (scene), forest:10% (scene)
Above-ground biomass 1km Grass:50%, forest:100% Grass:30%, forest:50% Grass:10%, forest:20%
Vegetation roughness index 1km Grass&forest:40% (scene) Grass&forest: 40% (scene) Grass&forest:10% (scene)
Shadow index 250m,1km Grass&forest:30% (scene) Grass&forest:20% (scene) Grass&forest:10% (scene)
Fraction of absorbed PAR 250m Grass:50%, forest:50% Grass:30%, forest:20% Grass:20%, forest:10%
Leaf area index 250m Grass:50%, forest:50% Grass:30%, forest:50% Grass:20%, forest:50%
temperature Land surface temperature both 500m <3.0K(scene) <2.5K(scene) <1.5K(scene)
Atmosphere Cloud Cloud flag/Classification Both 1km 10% (with whole-sky camera) Incl. below cloud amount Incl. below cloud amount
Classified cloud fraction Daytime 1km(シーン),
20%(on solar irradiance)*A1 15%(on solar irradiance)*A1 10%(on solar irradiance)*A1
Cloud top temp/height Both 1K*A2 3K/2km (top temp/height)*A3 1.5K/1km (temp/height)*A3
Water cloud OT/effective radius Daytime 10%/30% (CloudOT/radius)*A4 100% (as cloud liquid water*A6) 50%*A5/20%*A6
Ice cloud optical thickness 30%*A4 70%*A6 20%*A6
aerosol Aerosol over the ocean 0.1 (Monthly ta_670,865)*A7 0.1 (scene ta_670,865)*A7 0.05 (scene ta_380)
Land aerosol by near ultra violet 0.15 (Monthly ta_380)*A7 0.15 (scene ta_380)*A7 0.1 (ƒV[ƒ“‚Ìta_380)
Aerosol by Polarization 0.15(Monthly ta_670, 865)*A7 0.15(scene ta_670, 865)*A7 0.1(scene ta_670, 865)
Ocean Ocean color Normalized water leaving radiance Daytime 250m (coast)
1km (offshore)
4~9km (global)
60%(443~565nm) 50%(<600nm)
Atmospheric correction param 80%(ta_865nm) 50%(ta_865nm) 30%(ta_865nm)
Photosynthetically available radiatioin 20%(10km/ŒŽ) 15%(10km/ŒŽ) 10%(10km/ŒŽ)
In-water Chlorophyll-a concentration -60~+150% (offshore) -60~+150% -35~+50% (offshore),
-50~+100% (coast)
Suspended solid concentration -60~+150% (offshore) -60~+150% -50~+100%
Colored dissolved organic matter -60~+150% (offshore) -60~+150% -50~+100%
temperature Sea surface temperature Both 500m (coast)
1km (offshore)
4~9km (global)
0.8K (daytime) 0.8K (day&night time) 0.6K (day&night time)
Cryosphere Area / distribution Snow and Ice covered area Daytime 250m(scene) 10% (vicarious val with other sat. data) 7% 5%
OKhotsk sea-ice distribution 250m 5% 3%
Surface properties Snow and ice surface Temperature 500m (scene) 5K (vicarious val with other sat. data and climatology) 2K 1K
1km (global)
Snow grain size of shallow layer 250m(scene) 100% (vicarious val with climatology between temp-size) 50% 30%
Common note:
*1The "release threshold" is minimum levels for the first data release at one year from launch. The "standard" and "research" accuracies correspond to full- and extra success criteria of the mission respectively. Accuracies are shown by RMSE basically.
Land note:
*L1Defined with land reflectance~0.2, solar zenith<30deg, and flat surface. Release threshold is defined with AOT@500nm&li;0.25
Atmosphere note:
*A1Comparison with in-situ observation on monthly 0.1-degree
*A2Vicarious val. on sea surface and comparison with objective analysis data
*A3Inter comparison with airplane remote sensing on water clouds of middle optical thickness
*A4Release threshold is defined by vicarious val with other satellite data (e.g., global monthly statistics in the mid-low latitudes)
*A5Comparison with cloud liquid water by in-situ microwave radiometer
*A6Comparison with optical thickness by sky-radiometer (the difference can be large due to time-space inconsistence and large error of the ground measurements)
*A7Estimated by experience of aerosol products by GLI and POLDER