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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 testLower limitUpper limit
a. Water regions
 1Rf(868.5 nm)0.195 + Rf sun-glint0.045+ Rf sun-glint
 1NDVISmaller End-0.10-0.22
Larger End0.220.46
 1Rf (1050 nm)0.195 + Rf sun-glint0.045+ Rf sun-glint
 2Tb(10.8 μm)-Tb(12.0 μm)3.0 [K]2.6 [K]
 2Rf (1380 nm)0.0150.005
 -Tb(10.8 μm) (*1)297.5 [K]-
b. Land regions
 1Rf (673.5 nm)0.195+ Rf surface0.045+ Rf surface
 1NDVISmaller End-0.1-0.22
Larger End0.220.46
 1Rf (868.5 nm)/ Rf (1630 nm)1.051.00
 1Rf (1050 nm)0.195+ Rf surface0.045+ Rf surface
 2Tb(10.8 μm)-Tb(12.0 μm)3.0 [K]2.6 [K]
 2Rf (1380 nm)0.0400.030
 -Tb(10.8 μm) (*1)297.5 [K]-
c. Polar regions
 1Rf (673.5 nm)0.14+ Rf surface0.06+ Rf surface
 1NDVISmaller End-0.1-0.22
Larger End0.220.46
 2Rf (1380 nm)0.0600.030
 -Tb(10.8 μm) (*1)297.5 [K]-
  1. (*1)Restoral test