POST-LAUNCH VALIDATION OF GCOM-C/SGLI GEOPHYSICAL PRODUCTSJAXA Earth Observation Research Center

GCOM-C/SGLI instrument
Polarization (along-trackslant) telescopes (P1-2,
three pol. angles)
Visible and Nearinfrared Radiometer(VNR)

Non-polarization
telescopes (VN1-11)

InfraRed Scanner(IRS) (SW1-T2)

GCOM-C was
successfully launchedfrom Tanigashima
Space Center on
December 23rd 2017

The new SGLI features: 250m
(VNIR) and 250&500m (TIR)channels and two polarization /multi-direction channels (P).

Backward(-45deg.)

Forward(+45 deg.)

Multi-angle obs.
for λ= 670nm
and 865nm
Daily coverage of GCOM-C/SGLI Jan. 1, 2018

Nadir

Along track
Multi-channel Obs. @Nadir (17 chs) Swath: 1150km (VN, P)
1400km (SW, T)(250m resol.: 11chs, 500m resol.:
2 chs, 1km resol.: 4chs）

SGLI can cover the whole globe every 2days

SGLI channels
Lmax SNR at Lstd IFOV
λ
∆λ
Lstd
VN, P:
VN, P, SW:
CH VN, P, SW: nm
2
W/m /sr/µm
m
T: µm
T: Kelvin
T: NE∆T
VN1
380
10
60
210
250
250
VN2
412
10
75
250
400
250
VN3
443
10
64
400
300
250
VN4
490
10
53
120
400
250
VN5
530
20
41
350
250
250
VN6
565
20
33
90
400
250
VN7 673.5
10
23
62
400
250
VN8 673.5
20
25
210
250
250
VN9
763
12
40
350
400
250
VN10 868.5
20
8
30
400
250
VN11 868.5
20
30
300
200
250
P1
673.5
20
25
250
250
1000
P2
868.5
20
30
300
250
1000
SW1 1050
20
57
248
500
1000
SW2 1380
20
8
103
150
1000
3
50
57
250
SW3 1630200
SW4 2210
50
1.9
20
211
1000
T1
10.8
0.74 300
340
0.2
250/500
T2
12.0
0.74 300
340
0.2
250/500250m over land & coastal sea

2

GCOM-C/SGLI Products
Common （Level-1)
TOA radiance (including
Radiancesystem geometric correction)

Level-2

Land [S:9, R:5]

Surface Precise geometric correction
reflec- Atmospheric corrected
tance reflectance
Vegetation index
Above-ground biomass
Vegeta- Vegetation roughness index
tion and Shadow index
carbon Fraction of Absorbed
cycle Photosynthetically available
radiation
Leaf area index
TemperaSurface temperature-ture
Land net primary production
Water stress trend
ApplicaFire detection index
tion
Land cover typeLand surface albedo

Blue: Standard products [L1: 1 product, L2: 28 products]
Pink: Research products [L2: 23 products]

Atmosphere [S:8, R:3]

Ocean [S:7, R:7]

Cloud flag/Classification
Normalized water leaving radianceClassified cloud fraction
Atmospheric correction parameter
Ocean
Cloud top temp/heightcolor Photosynthetically available
radiation
Water cloud optical
Euphotic zone depth
Cloud thickness /effective
radiusChlorophyll-a conc.
Ice cloud opticalIn-water Suspended solid conc.
thickness
Colored dissolved organic matter
Water cloud geometrical In-water Inherent optical properties
thickness
TemperaSea surface temperature
Aerosol over the ocean-tureLand aerosol by near
Ocean net primary productivity
Aerosolultra violet
Phytoplankton functional type
Aerosol by Polarization
ApplicaRedtide
tion
Radia- Long-wave radiation flux
multi sensor merged ocean color
tion
multi sensor merged SST
budget Short-wave radiation flux

Cryosphere [S:4, R:8]
Snow and Ice covered area
Area/ Okhotsk sea-ice distribution
distribu- Snow and ice classification
tion Snow covered area in forestand mountain
Snow and ice surface
Temperature
Snow grain size of shallow
layer
Surface Snow grain size of subsurface
proper- layerties
Snow grain size of top layer
Snow and ice albedo
Snow impurity
Ice sheet surface roughness
Bounda- Ice sheet boundaryry
monitoring

Accuracy Requirements and Validation Methods for Land products
標準プロダクトStandard Product

日照域・全日別 分解能
Day/Night
Resol.

精密幾何補正済放射輝度

全日Precise geometric correction

Day&Night

大気補正済陸域反射率 (雲検知含む)
Atmospheric corrected reflectance(incl. cloud detection)
植生指数
Vegetation index

精度目標 Accuracy Targets
リリース

標準

ReleaseStandard

Validation Methods

ReleaseStandard

Goal

・GCP database derived from AVNIR-2 etc.

◎

◎

◎

・In-situ observation

◎
○

◎
○

◎
○

- Other Sat. (MODIS, VIIRS etc.)

△

△

△

・In-situ observation

◎

◎

◎

- Other Sat. (MODIS, VIIRS etc.)

○

△

△

・In-situ observation@ 500mx500m site

◎
○

◎
○

◎
○

○

△

△

◎

◎

◎

◎

◎

◎

△

△

△

<1pixel250m

0.3 (<=443nm), 0.1 (<=443nm), 0.05 (<=443nm),
0.2 (>443nm) 0.05 (>443nm) 0.025 (>443nm) - Sim. of SR with BiRS
(scene)*11(scene) *11（scene）*11

250m

Grass：20%(scene),Forest：15%(scene)<0.25pixel

Grass：10%(scene),Forest：10%(scene)Grass： 50%,
Forest： 100%

Grass：30%、
Forest：50%

1km

Grass･Forest：
40% (scene)

Grass･Forest： Grass･Forest：
・In-situ observation
20% (scene)
10% (scene)

カゲ指数
Shadow index

250m,
1km

Grass･Forest：
30% (scene)

Grass･Forest： Grass･Forest： ・In-situ observation
20% (scene)
10% (scene)- Other Sat. (MODIS, VIIRS etc.)

光合成有効放射吸収率
fAPAR

250m

Grass： 50%,
Forest： 50%

Grass：30%、
Forest：20%

Grass：20%,
Forest：10%

・In-situ observation@ 500mx500m site

◎

◎

◎

- Other Sat. (MODIS, VIIRS etc.)

×

×

葉面積指数
Leaf area index

250m

Grass： 50%,
Forest： 50%

Grass：30%、
Forest：30%

Grass：20%,
Forest：20%

・In-situ observation@ 500mx500m site

○
◎

◎

◎

- Other Sat. (MODIS, VIIRS etc.)

○

×

×

・In-situ observation

◎

◎

◎

500m

Less than 2.5K
Less than 3.0K
Less than 1.5K - LST derived from Tair at Tower sites,(scene) （放(scene) （気温）(scene) （放射） automated on Cal/Val web
射）

△

△

△

○

×

×

地上部バイオマス
Above-ground biomass

地上日照域
Daytime only

植生ラフネス指数
Vegetation roughness index

地表面温度Surface temperature

全日
Day &Night

1km

Grass：10%,
Forest：20%

Priority

主な検証手段250m

Grass： 25%(scene),Forest： 20%(scene)<0.5pixel

目標
Goal◎: Primary data, ○: Secondary data△: Auxiliary data

Ecological Model (BEAMS)- Other Sat. (MOLI, GEDI, PALSAR2, other
SARs etc.)- Other Sat. (MODIS, VIIRS etc.)4Accuracy Requirements and Validation Methods for Atmosphere products
標準プロダクトStandard Product

日照域・全日別 分解能
Day/Night
Resol.

雲フラグ･タイプ
全日
Cloud flag/Classification Day & Night
雲種別雲量Classified cloud fraction(Classified CF)

地上日照域
Daytime only

雲頂温度･高度
Cloud top temp/height

全日
Day & Night

海洋上エアロゾル
Aerosol over the ocean
陸上エアロゾル(近紫外)Land aerosol by near
ultra violet (τa@380nm)
陸上エアロゾル(偏光)Aerosol by Polarization

リリース

標準

ReleaseStandard

10%

目標
Goal

地上日照域
Daytime only

Validation Methods

ReleaseStandard

Goal

◎

△

△

◎

◎

◎

○

△

△

△

◎

◎

◎

-

-

・In-situ obs. of CLW by Skynet PMR

△

◎

◎

・In-situ obs. of COT by Skynet sky-radiometer

△

◎

△

△

・In-situ obs. of COT by Skynet sky-radiometer

△
◎
△

◎

◎

- Other Sat. (MODIS, VIIRS etc.)

◎

△

△

・In-situ obs. of AOT by Skynet sky-radiometer

△

◎

◎

- Other Sat. (MODIS, VIIRS etc.)

◎

△

△

△

◎

◎

◎

△

△

- Irradiance obs. from BSRN, Skynet etc.
20% (as solar 15% (as solar 10% （as solar- Climatology from ISCCP etc.
rad.) (*9)rad.) (*9)rad.) (*9)- Classified CF from sky-camera- RS data from ground, airborne, and other satellites
3K(*5)/2km
1.5K/1km (*5) (lidar, radar, radiometer
1K （*4）(*5)- Cal of TIR bands & JMA Objective analysis data

Scene:
1km,
Global:0.1deg. 30% (*6：other 70% (*8)sat.)

20% (*8)0.1(monthly
0.1(scene’s
ave
0.05(scene’sτa_670,865)(*
τa_670,865) )(τa_670,865)
10)
*10)

Priority

主な検証手段Evaluated as the cloud fraction - Cloud amount from sky-camera based on BI-SI
methodproduct

10%/30% (as 100% (as CLW) 20% (as COT,
COT, Re) (*6： (*7：PMR on *8) / 50% (asthe ground) CLW) (*7)
other sat.)

水雲光学的厚さ･粒径
Water cloud OT/effective
radius
氷晶雲光学的厚さ
Ice cloud optical
thickness

1km

精度目標 Accuracy Targets◎: Primary data, ○: Secondary data△: Auxiliary data

- Other Sat. (MODIS, VIIRS etc.)

0.15(monthly 0.15(scene ave 0.1(scene’s
ave. τa@τa @380nm for τa@ 380nm for ・In-situ obs. of AOT by Sky-radiometer
380nm for UV, UV,
UV, 670&
670& 865nm 670&865nm for
865nm for Pol )for Pol) )(*10) Pol)(*10)- Other Sat. (MODIS, VIIRS etc.)

Accuracy requirements for Ocean products
標準プロダクトStandard Product

日照域・全日分解能別
Resol.
Day/Night

海面水温
Sea surface temperature

標準Standard

目標
Goal

Validation Methods

Standard

Goal

◎

◎

◎

△

△

△

- Other Sat. (MODIS, VIIRS etc.)

○

○

○

50%
30%
・In-situ observation80%(AOT@865n (AOT@865nm
Coast (Cst): (AOT@865nm)- Other Sat. (MODIS, VIIRS etc.)
m)
)
250m

◎

◎

◎

○

○

○

・In-situ observation

◎

◎

◎

- Other Sat. (MODIS, VIIRS etc.)

○

○

○

・In-situ observation

◎

◎

◎

- Other Sat. (MODIS, VIIRS etc.)

○

○

○

・In-situ observation

◎

◎

◎

- Other Sat. (MODIS, VIIRS etc.)

○

○

○

・In-situ observation

◎

◎

◎

- Other Sat. (MODIS, VIIRS etc.)

○

○

○

・In-situ SST obtained from iQuam,
automated on Cal/Val web

◎

◎

◎

△
○

△
○

△
○

・In-situ observation

50%
30% (<600nm) - Temporal variation of SGLI nLw,
60%(<600nm)
0.25W/m2/str(443~565nm) 0.5W/m2/str/
automated on Cal/Val web/um (>600nm)
um (>600nm)

大気補正パラメータ
Atmospheric correction
param
光合成有効放射量地上Photosynthetically available 日照域
radiatioin

懸濁物質濃度Suspended solid
concentration
有色溶存有機物吸光係数
Colored dissolved organic
matter

リリース
ReleaseDaytimeonly

Priority

主な検証手段Release

正規化海水射出放射輝度
Normalized water leaving
radiance

クロロフィルa濃度
Chlorophyll-a concentration

精度目標 Accuracy Targets◎: Primary data, ○: Secondary data△: Auxiliary data

15%
Open Ocean 20% (10km/M)(10km/M)(OO):
1km
Global:4-9km

10%(10km/M)−60~+150%(OO)−35~+50%(OO),−60~+150%−50~+100%(Cst)−60~+150%(OO)−60~+150% −50~+100%−60~+150%(OO)−60~+150% −50~+100%

Coast: 500m
0.8K (Daytime 0.8K (Day &全日
Other: same
Day & Night
only)
Night)as above

0.6K (Day &Night)- Other Sat. (MODIS, VIIRS etc.)
・In-situ observation

Accuracy requirements for Cryosphere products
標準プロダクトStandard Product

日照域・全日別
Day/Night

精度目標 Accuracy Targets
分解能

リリース

標準

ReleaseStandard

目標
Goal

積雪･海氷分布Snow and Ice coveredarea

Scene:
250m,
Global:
1km

10%

7%

5%

オホーツク海海氷分布
OKhotsk sea-ice
distribution

250m

10%

5%

3%

雪氷面温度
Snow and ice surface
Temperature

浅層積雪粒径Snow grain size ofshallow layer

地上
日照域
Daylight

5K

2K

1K

Scene:
500m,
Global:
1km

100%

50%

30%

◎: Primary data, ○: Secondary data△: Auxiliary data

Priority

主な検証手段Validation Methods- DCDF snow depth only over land,
automated on Cal/Val web- Other Sat. (MODIS, VIIRS, Landsat-8
etc.)・Other Sat. (MODIS, VIIRS, Landsat-8
etc.)
・Photos etc. (Aerial photos, handdrawn ice map)
・Tsurf from SIGMA, BSRN AWS@Greenland, Dome-C etc., automatedon Cal/Val web
・In-situ observations @Greenland,
Svalbard etc.
・Other Sat. (MODIS, VIIRS, Landsat-8
etc.)
・Auto-Optical Measurements@Hokkaido, Svalbard etc.）
・In-situ observations @Greenland,
Hokkaido, Svalbard etc. (campaign)
・Other Sat. (MODIS, VIIRS, Landsat-8
etc.)
・Vicarious Val. with Climatology of
Temp-Grain size relation

ReleaseStandard

Goal

○

○

○

◎

◎

◎

◎

◎

◎

△

△

△

○

◎

◎

○

○

○

◎

△

△

○

○

○

○

◎

◎

○

△

△

◎

○

○
7

Validation Results of Land Products
Atmospherically corrected reflectance (RSRF)

Validation Method:- Accuracy targets were defined as RMSE evaluated with the in-situ measured reflectances acquired at the
ground surface with moderate reflectance of around 0.2 at solar zenith angles less than 30 degrees.
- In addition, the release threshold is defined as the value acquired at the condition of aerosol optical depth(at the wavelength of 500 nm) less than 0.25.

Validation data and condition etc.:- In-situ data measured within the time difference of 1-1.5 hours from SGLI observation at the 9 sites shown
below (for the period during Jan. 24 to Sep. 28, 2018)
AsiaFlux/PEN sites
PI’s sites
PI’s site

CEOS/RadCALNET

Validation Results of Land Products
Atmospherically corrected reflectance (RSRF)
Validation Results:
0.015
36%

0.013
26%

0.014
23%

0.017
23%

0.021
20%

0.027
27%

0.026
19%

0.076
27%

0.062
20%

0.032
9%

0.036
9%

0.034
11%

0.036
31%

0.083
27%

Evaluated with in-situ
measured flux
reflectances because
in-situ BRDF
observations are
difficult on the groundwithin 1 km x 1km fieldof view.

Estimated errors

Release threshold

Standard accuracy

Goal accuracy

0.019(<=443nm)
0.084 (>443nm)

0.3 (<=443nm) →150%
0.2 (>443nm) →100%

0.1 (<=443nm) →50%
0.05 (>443nm) →25%

0.05 (<=443nm) →25%
0.025 (>443nm) →13%

Release threshold is achieved

SGLI Atmospherically corrected reflectance (RSRF)

May 01-31, 2018
(BRDF corrected monthly average)

Geometric Errors in NDVI (L3Map) Period: from Jan. 1st 2018 to June 19th 2019

May 01-31, 2019

Validation Results of Atmosphere Products
Classified Cloud Fraction (CLFR)
Validation Method:- Accuracy targets are defined as the relative error (RE) of “solar radiation on the ground”
derived from SGLI cloud products including CLFR (indirect validation). The REs are evaluated bycomparing SGLI-derived solar radiation, which is monthly average for every 0.1 degree global
grids, with in-situ measured solar radiation (monthly average).
Validation Data and Condition etc.:- Solar radiation was derived using SGLI cloud related products, i.e., cloud flag (CLFG), cloudproperties (CLPR), atmospherically corrected land surface reflectance (RSRF) , and ancillary data
(meteorological data, elevation etc.).
- When comparing with in-situ data, only the data meeting the following conditions were used;- The time difference between SGLI and in-situ observation was less than 5 minutes.
Validation Period:- BSRN ： Jul. 1st to Oct. 31st 2018 for 22 sites (4 months)- SKYNET ： Jul. 1st to Oct. 31st 2018 for 3 domestic sites (4 months)

Validation Results of Atmosphere Products
Classified Cloud Fraction (CLFR)
Validation Results:

Monthly average

Supplemental: Non-monthly average (Daily)

SGLI: 0.1 deg. Grid average vs. In-situ instantaneous values

Estimated errors

Release threshold

Standard accuracy

Goal accuracy

10 % (as solar radiation)

20% (as solar radiation)

15% (as solar radiation)

10% （as solar radiation)

Release threshold, Standard and Goal accuracies are achieved*（*Standard and Target accuracies of cloud flag/classification product are also achieved）

SGLI Cloud Fraction

May 01-31, 2019

Validation Results of Ocean Products
Sea Surface Temperature (SST)
Validation Method:- Overall RMS errors are evaluated comparing SGLI derived SST with those derived frombuoy measurements obtained from iQuam.
Validation Data and Condition etc.:- In-situ buoy data acquired within the spatial difference of 10 km and time difference of 2 hours from SGLI
observations were used for comparison.
- In addition, before the comparison, the SGLI SSTs that meet the following conditions were selected;
1. Standard deviation of SGLI SST within 5 x 5 pixels around the buoy location is less than 1.0 ℃.
2. The difference between maximum and minimum of SGLI SSTs within the 5x5 pixel box is less than 3.0 ℃.
3. The difference between SGLI SST and iQuam SST is less than 5 ℃.

Validation Period:- Oct. 1st to 31st 2018
(1 month).
Location of buoy data

Validation Results of Ocean Products
Sea Surface Temperature (SST)
Validation Results:
DaytimeNighttime

RMSE : 0.50℃

RMSE: 0.41℃
Estimated errors

Release threshold

Standard accuracy

Goal accuracy

0.4℃ (day)0.5℃ (night)

0.8℃ (day)

0.8℃

0.6℃

Release threshold, Standard and Goal accuracies are achieved

SGLI Sea Surface Temperature

May 01-31, 2019
deg.C

Validation Results of Cryosphere Products
Snow and Ice Surface Temperature (SIST)
Validation Method:- Release threshold: Overall RMS errors are evaluated comparing SGLI derived SIST with those fromother satellite products.
- Standard accuracy: RMS errors are evaluated comparing SGLI SIST with those from in-situ thermal
radiometer measurements on the ground.

Validation Data and Condition etc.:- Data source of other satellite: MODIS MOD11A1 IST products- Data source of in-situ data: In-situ measured thermal radiometer data installed at the PROMICE
Automatic Weather Stations (AWS) at Greenland. The in-situ data acquired at within the timedifference of 30 minutes from SGLI observations are used.

Validation Period:- Jul. 1st to Sep. 30th 2018 (3 months)

Validation Results of Cryosphere Products
Snow and Ice Surface Temperature (SIST)
Validation Results:

MOD11A1
RMSE = 2.6K
Bias = 0.25K[K]
C2AB_SIST

For the release thresholdevaluation (vs. MODIS product)

Estimated errors

Release threshold

Standard accuracy

Goal accuracy

Other sat.: 2.6K
In-situ: 1.5K

5K （vs. other sat.）

2K （vs. in-situ）

1K （vs. in-situ）

For the standard accuracy evaluation(vs. AWS measurements)

Release threshold and Standard accuracy are achieved
別1 - 19

SGLI Snow Cover and Snow Physical Variable Products

Apr. 07-14
2018
Snow Cover Distribution(Ver. 1.001*)

Apr. 07-22
2018
Snow surface temperature(Ver.1.001*)

Apr. 07-22
2018
Snow grain size of shallow layer(Ver.1.001*)

Summary of the Current Evaluation Status (1/2)
Area Group

Product

LandStandard accuracy

Goal accuracy◎<1 pixel<0.5 pixel<0.25 pixel(incl. cloud detection)○

0.3 (<=443nm),
0.2 (>443nm) (scene)

0.1 (<=443nm),
0.05 (>443nm) (scene)

0.05 (<=443nm),
0.025 (>443nm) (scene)

Vegetation index○

Above-ground biomass

○
○
○
○
○

Grass:25% (scene),
forest:20% (scene)
Grass:50%, forest: 100%
Grass & forest: 40% (scene)
Grass & forest: 30% (scene)
Grass:50%, forest: 50%
Grass:50%, forest: 50%

Grass:20% (scene),
forest:15% (scene)
Grass:30%, forest:50%
Grass & forest:20% (scene)
Grass & forest:20% (scene)
Grass:30%, forest:20%
Grass:30%, forest:30%

Grass:10% (scene),
forest:10% (scene)
Grass:10%, forest:20%
Grass & forest:10% (scene)
Grass & forest:10% (scene)
Grass:20%, forest:10%
Grass:20%, forest:20%○<3.0 K (scene)<2.5 K (scene)<1.5 K (scene)

10% (with whole-sky
camera)20% (on solar irradiance)

Incl. below cloud amount

Incl. below cloud amountClassified cloud fraction☆
☆

15% (on solar irradiance)

10% (on solar irradiance)

Cloud top temp/height◎

1K

3 K/2 km (top temp/height)

1.5 K/1 km (temp/height)

Water cloud OT/effective radius○

10%/30% (CloudOT/radius) 100% (as cloud liquid water) 50% / 20%

Vegetationand carbon Vegetation roughness index
cycle
Shadow index

fAPAR
Leaf area index
temperature Surface temperature

Cloud flag/Classification

Atmosphere

Release threshold

Precise geometric correction

Surfacereflectance Atmospheric corrected reflectance

Cloud

Status*1

Ice cloud optical thickness
Aerosol over the oceanLand aerosol by near ultra violet
Aerosol by Polarization

○
30%
70%
20%
○
0.1 (Monthly τa_670,865)
0.1 (scene τa_670,865)
0.05 (scene τa_670,865)
aerosol○
0.15 (Monthly τa_380)
0.15 (scene τa_380)
0.1 (scene τa_380 )◎0.15 (Monthlyτa_670,865) 0.15 (scene τa_670,865)
0.1 (scene τa_670,865)*1 Symbols denote as follows; 〇: the release threshold achieved, ◎: the standard accuracy achieved, ☆: the goal accuracy achieved.

Summary of the Current Evaluation Status (2/2)
Area Group

Ocean

Ocean color

In-water

Product

Cryosphere

Surfaceproperties

Release threshold

Standard accuracy

Goal accuracy

Normalized water leaving radiance(incl. cloud detection)◎

60% (443~565nm)

50% (<600nm)
0.5W/m2/str/um(>600nm)Atmospheric correction parameters○

80% (AOT@865nm)

50% (AOT@865nm) 30% (AOT@865nm)

Photosynthetically available
radiation◎

20% (10km/month)

15% (10km/month)

10% (10km/month)

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%☆

0.8 K (daytime)

0.8 K (day & nighttime)

0.6 K (day & nighttime)

Snow and Ice covered area (incl.
cloud detection)

○

10%

7%

5%

Okhotsk sea-ice distribution

○

10%

5%

3%

Snow and ice surface Temperature◎

5 K (vicarious val with other sat. dataand climatology)

2K

1K

Snow grain size of shallow layer○

100% (vicarious val with climatology
between temp-size)

50%

30%

temperature Sea surface temperature
Area/
distribution

Status*1(vicarious val withother sat. data)

30% (<600nm)
0.25W/m2/str/um(>600nm)*1 Symbols denote as follows; 〇: the release threshold achieved, ◎: the standard accuracy achieved, ☆: the goal accuracy achieved.

Summary• SGLI Level-2 (L2) products of Ver. 1 have been released to the public from “the G-Portal”
since Dec. 20, 2018.

*G-Portal : https://gportal.jaxa.jp/gpr/index/index• The release thresholds (the first accuracy target) of all the SGLI L2 standard products
have been achieved, which corresponds to achieving “the Minimum Success”.
• In addition, the evaluation results indicate that nine (and three) L2 products havealready reached the levels of the standard accuracy for “the Full Success” (and the goal
accuracy for “the Extra Success”) at this stage.
• A remaining issue to be solved in Ver. 1 is the occurrence of geometric errors in tile
products noticeable around Europe and Africa from Jan. 1st 2018 to June 19th 2019.
• SGLI L2 products updated to Ver. 2 will be available in June 2020 (1.5-yr interval).

G-Portal

Standard products are downloadable at ”G-Portal”
Users can search SGLI productswith “physical variable” or“satellite name”
Heavy users can download the data from FTP server directly.

https://gportal.jaxa.jp/gpr/index/index
Current satellite status and user handbooks are available at“Product Information and Operation status”