・Added auxiliary data (Himawari SST data)
・Added SD array (/Image_data/Cloud_probability)
・Improved the cloud identification （Improved cloud mask of coast and inland water area）
・Modified the probability density function of cloud mask
・Modified QA flag

Bit	ver1	Description	SST_L3_mask*
0	No data		1
1	Land	0: water, 1: land	1
2	Rejected by QC	Out of the range: [-5 degC, 40 degC]	1
3	Retrieval error	SST determination error	1
4	No data (TIR1)		1
5	No data (TIR2)		1
6	no		-
7	no		-
8	1: daytime, 0: nighttime or no visible data		0
9	no		-
10	no		-
11	Unknown clear/cloudy	Clear/cloudy could not be determined.	1
12	Cloudy	Affected by clouds	1
13	Acceptable (possibly cloudy)	Probably clear	0
14	Good	Clear	0
15	0: unreliable (inland/too close to land), 1: reliable	Denotes the reliability of the clear/cloud determination	0

* Bits masked by statistical processing are indicated by 1.

Bit	Ver2	description	SST_L3_mask*
0	invalid data		1
1	Land	0: water, 1: land	1
2	Rejected by QC	SST out of the range: [-5 degC, 40 degC]	1
3	Retrieval error	SST determination error	1
4	Invalid data (TIR1)		1
5	Invalid data (TIR2)		1
6	reserved		-
7	reserved		-
8	1: daytime, 0: nighttime or no visible data		0
9	Near Land	one or more land pixels within the 5x5-pixel window	1
10	Cloudy	Affected by clouds	1
11	Unknown clear/cloudy	Clear/cloudy could not be determined.	1
12	Possibly cloudy	Possibly affected by clouds	1
13	Acceptable	Probably clear	0
14	Good	Clear	0
15	reserved		-

* Bits masked by statistical processing are indicated by 1.

*Download:QA_flag(Ver1) Sample Image

*Download:QA_flag(Ver2) Sample Image

Ver1	Attribute		Remarks
Attribute of Image_data
Attribute of Image_data	Grid_interval	1000	250m, 500m, 1000m
	Grid_interval_unit	meter
	Image_projection	L1B reference grid
	Number_of_lines	1495	Variable
	Number_of_pixels	1250	Variable
Line_tai93
Line_tai93 64-bit floating-point	Data_description	TAI93 at each line
	Dim0	L1B-lines
	Error_value	-1
	Maximum_valid_value	999999999
	Minimum_valid_value	0
	Unit	second
SST
SST 16-bit unsigned integer	Data_description	Sea Surface Temperature[SST]: SST[degree]=DN*Slope+Offset
	Dim0	Line grids
	Dim1	Pixel grids
	Error_DN	65535
	Land_DN	65534
	Cloud_error_DN	65533
	Retrieval_error_DN	65532
	Maximum_valid_DN	65531
	Minimum_valid_DN	0
	Mask_for_statistics	6207	Detail: QA_flag_information(～L3_mask)
	Slope	0.0012
	Offset	-10
	Spatial_resolution	1000	250m, 500m, 1000m
	Spatial_resolution_unit	meter
	Unit	degree

Ver2	Attribute		Remarks
Attribute of Image_data
Attribute of Image_data	Grid_interval	1000	250m, 500m, 1000m
	Grid_interval_unit	meter
	Image_projection	L1B reference grid
	Number_of_lines	1495	Variable
	Number_of_pixels	1250	Variable
Cloud_probability
Cloud_probability 8-bit unsigned integer	Data_description	Cloud Probability
	Dim0	Line grids
	Dim1	Pixel grids
	Error_DN	255
	Maximum_valid_DN	100
	Minimum_valid_DN	0
	Slope	1
	Offset	0
	Spatial_resolution	1000	250m, 500m, 1000m
	Spatial_resolution_unit	meter
	Unit	%
Line_tai93
Line_tai93 64-bit floating-point	Data_description	TAI93 at each line
	Dim0	L1B-lines
	Error_value	-1
	Maximum_valid_value	999999999
	Minimum_valid_value	0
	Unit	second
SST
SST 16-bit unsigned integer	Data_description	Sea Surface Temperature[SST]: SST[degree]=DN*Slope+Offset
	Dim0	Line grids
	Dim1	Pixel grids
	Error_DN	65535
	Land_DN	65534
	Cloud_error_DN	65533
	Retrieval_error_DN	65532
	Maximum_valid_DN	65531
	Minimum_valid_DN	0
	Mask_for_statistics	7743	Detail: QA_flag_information(～L3_mask)
	Slope	0.0012
	Offset	-10
	Spatial_resolution	1000	250m, 500m, 1000m
	Spatial_resolution_unit	meter
	Unit	degree