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Progress in Earth and Planetary Science

Table 3 Thresholds for cloud screening with SGLI. a: Over water, b: Over land, and c: Over polar regions. Rf and Tb are reflectance and brightness temperature, respectively

From: Theoretical basis of the algorithms and early phase results of the GCOM-C (Shikisai) SGLI cloud products

 

Threshold test

Lower limit

Upper limit

a. Water regions

 1

Rf(868.5 nm)

0.195 + Rf sun-glint

0.045+ Rf sun-glint

 1

NDVI

Smaller End

-0.10

-0.22

Larger End

0.22

0.46

 1

Rf (1050 nm)

0.195 + Rf sun-glint

0.045+ Rf sun-glint

 2

Tb(10.8 μm)-Tb(12.0 μm)

3.0 [K]

2.6 [K]

 2

Rf (1380 nm)

0.015

0.005

 -

Tb(10.8 μm) (*1)

297.5 [K]

-

b. Land regions

 1

Rf (673.5 nm)

0.195+ Rf surface

0.045+ Rf surface

 1

NDVI

Smaller End

-0.1

-0.22

Larger End

0.22

0.46

 1

Rf (868.5 nm)/ Rf (1630 nm)

1.05

1.00

 1

Rf (1050 nm)

0.195+ Rf surface

0.045+ Rf surface

 2

Tb(10.8 μm)-Tb(12.0 μm)

3.0 [K]

2.6 [K]

 2

Rf (1380 nm)

0.040

0.030

 -

Tb(10.8 μm) (*1)

297.5 [K]

-

c. Polar regions

 1

Rf (673.5 nm)

0.14+ Rf surface

0.06+ Rf surface

 1

NDVI

Smaller End

-0.1

-0.22

Larger End

0.22

0.46

 2

Rf (1380 nm)

0.060

0.030

 -

Tb(10.8 μm) (*1)

297.5 [K]

-

  1. (*1)Restoral test
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