雪氷特性 (SIPR)

[DOI: 10.57746/EO.01gs73b3t54vbanyyszgcvqtsy]
[DOI: 10.57746/EO.01gs73b3v45wngznvj72tfkg36]

概要

SIPR	定義	波長865nmの反射率をもとに抽出する積雪の浅い層に存在する氷結晶の粒径
	単位	μm
	ATBD	Ver.1 (Mar. 2016) Ver.2 (May. 2020)

Ver2での変更点

・積雪粒径求解アルゴリズム改良
・射出率テーブル更新

Ver3での変更点

・トレーニングデータセットの更新
・出力データセット追加（雪氷面アルベド[SALB: snow and ice blue-sky albedo]）
・Mask_for_statisticsの変更

サンプル画像

ファイル形式	Ver.1	Ver.2	Ver.3
hdf5	TBU	SIPRQ(250m)	SIPRQ(250m)
Image	TBU	SGSLQ(250m) SISTQ(250m)	SGSLQ(250m) SISTQ(250m) SALBQ(250m)

格納物理量

Ver.1,2 Ver.3

Data name	Description
SGSL	Snow grain size of shallow layer
SIST	Snow and ice surface temperature based on a model snow
QA_flag

Data name	Description
SGSL	Snow grain size of shallow layer
SIST	Snow and ice surface temperature based on a model snow
SALB	Direct retrievals of broadband blue sky snow albedo
QA_flag

QA_flag情報

Ver.1 Ver.2,3 Ver.1(Sample Image) Ver.2,3(Sample Image)

Bit	Data name	SGSL_L3_mask*	SIST_L3_mask*
0	no input data	1	1
1	land/water flag	0	0
2	cloudy/clear flag	0	0
3	day/night(shadow) flag	0	0
4	snow over land or seaice	1	1
5	snow mixed w/t vegetation or bare ice	1	1
6	melting snow over land or seaice	1	1
7	stray light correction (VN)	0	0
8	stray light correction (SW)	0	0
9	stray light correction (IR)	0	0
10	radiance saturation	0	0
11	sun-glint area	0	0
12	missing channel(VN)	0	0
13	missing channel(SW)	0	0
14	missing channel(IR)	0	0
15	reserved	-	-

* 1は統計処理時にマスクされるBitを意味します。

QA_flagについてはこちらをご参照ください。

Bit	Data name	Description	SGSL_L3_mask*	SIST_L3_mask*
0	no input data		1	1
1	land/water flag		0	0
2	cloudy/clear flag		1	1
3	day/night(shadow) flag		1	1
4	snow over land or seaice	111 no snow	1	1
5	snow mixed w/t vegetation or bare ice		1	1
6	melting snow over land or seaice		1	1
7	stray light correction (VN)		0	0
8	stray light correction (SW)		0	0
9	stray light correction (IR)		0	0
10	radiance saturation		0	0
11	sun-glint area		0	0
12	missing channel(VN)		0	0
13	missing channel(SW)		0	0
14	missing channel(IR)		0	0
15	reserved		-	-

* 1は統計処理時にマスクされるBitを意味します。

QA_flagについてはこちらをご参照ください。

*Download:QA_flag(Ver1) Sample Image

*Download:QA_flag(Ver2) Sample Image

Attribute情報

Ver.1 Ver.2 Ver.3

Data name	Attribute		Remarks
Attribute of Image_data
Attribute of Image_data	Number_of_lines	4800	250m: 4800 1km: 1200
	Number_of_pixels	4800	250m: 4800 1km: 1200
	Grid_interval	0.00208333	250m: 0.00208333 1km: 0.00833333
	Grid_interval_unit	deg
	Image_projection	L1B reference grid
	Lower_left_latitude	40	Variable
	Lower_left_longitude	130.541
	Lower_right_latitude	40
	Lower_right_longitude	143.595
	Upper_left_latitude	50
	Upper_left_longitude	155.572
	Upper_right_latitude	50
	Upper_right_longitude	171.13
SGSL
SGSL 16-bit unsigned integer	Slope	0.08
	Offset	20
	Data_description	Snow grain size of shallow layer (SGSL): SGSL = slope*DN + offset
	Unit	micrometer
	Maximum_valid_DN	62250
	Minimum_valid_DN	0
	Error_DN	65535
	No_retrieval_DN_(night)	65534
	No_retrieval_DN_(no_main_VN_SW_channels)	65533
	No_retrieval_DN_(no_main_IR_channels)	65532
	No_retrieval_DN_(out_of_parameter_range)	65531
	Mask_for_statistics	113	詳細: QA_flag情報(～L3_mask)
SIST
SIST 16-bit unsigned integer	Slope	0.0005525
	Offset	240
	Data_description	Snow and ice surface temperature based on a model snow (SIST): SIST = slope*DN + offset
	Unit	kelvin
	Maximum_valid_DN	59999
	Minimum_valid_DN	0
	Error_DN	65535
	No_retrieval_DN_(night)	65534
	No_retrieval_DN_(no_main_VN_SW_channels)	65533
	No_retrieval_DN_(no_main_IR_channels)	65532
	No_retrieval_DN_(out_of_parameter_range)	65531
	Mask_for_statistics	113	詳細: QA_flag情報(～L3_mask)

Data name	Attribute		Remarks
Attribute of Image_data
Attribute of Image_data	Number_of_lines	4800	250m: 4800 1km: 1200
	Number_of_pixels	4800	250m: 4800 1km: 1200
	Grid_interval	0.00208333	250m: 0.00208333 1km: 0.00833333
	Grid_interval_unit	deg
	Image_projection	L1B reference grid
	Lower_left_latitude	40	Variable
	Lower_left_longitude	130.541
	Lower_right_latitude	40
	Lower_right_longitude	143.595
	Upper_left_latitude	50
	Upper_left_longitude	155.572
	Upper_right_latitude	50
	Upper_right_longitude	171.13
SGSL
SGSL 16-bit unsigned integer	Slope	0.08
	Offset	20
	Data_description	Snow grain size of shallow layer (SGSL): SGSL = slope*DN + offset
	Unit	micrometer
	Maximum_valid_DN	62250
	Minimum_valid_DN	0
	Error_DN	65535
	No_retrieval_DN_(night)	65534
	No_retrieval_DN_(no_main_VN_SW_channels)	65533
	No_retrieval_DN_(no_main_IR_channels)	65532
	No_retrieval_DN_(out_of_parameter_range)	65531
	Mask_for_statistics	125	詳細: QA_flag情報(～L3_mask)
SIST
SIST 16-bit unsigned integer	Slope	0.0005525
	Offset	240
	Data_description	Snow and ice surface temperature based on a model snow (SIST): SIST = slope*DN + offset
	Unit	kelvin
	Maximum_valid_DN	59999
	Minimum_valid_DN	0
	Error_DN	65535
	No_retrieval_DN_(night)	65534
	No_retrieval_DN_(no_main_VN_SW_channels)	65533
	No_retrieval_DN_(no_main_IR_channels)	65532
	No_retrieval_DN_(out_of_parameter_range)	65531
	Mask_for_statistics	125	詳細: QA_flag情報(～L3_mask)

Data name	Attribute		Remarks
Attribute of Image_data
Attribute of Image_data	Number_of_lines	4800	250m: 4800 1km: 1200
	Number_of_pixels	4800	250m: 4800 1km: 1200
	Grid_interval	0.00208333	250m: 0.00208333 1km: 0.00833333
	Grid_interval_unit	deg
	Image_projection	L1B reference grid
	Lower_left_latitude	40	Variable
	Lower_left_longitude	130.541
	Lower_right_latitude	40
	Lower_right_longitude	143.595
	Upper_left_latitude	50
	Upper_left_longitude	155.572
	Upper_right_latitude	50
	Upper_right_longitude	171.13
SGSL
SGSL 16-bit unsigned integer	Slope	0.08
	Offset	20
	Data_description	Snow grain size of shallow layer (SGSL): SGSL = slope*DN + offset
	Unit	micrometer
	Maximum_valid_DN	62250
	Minimum_valid_DN	0
	Error_DN	65535
	No_retrieval_DN_(night)	65534
	No_retrieval_DN_(no_main_VN_SW_channels)	65533
	No_retrieval_DN_(no_main_IR_channels)	65532
	No_retrieval_DN_(out_of_parameter_range)	65531
	Mask_for_statistics	28797	詳細: QA_flag情報(～L3_mask)
SIST
SIST 16-bit unsigned integer	Slope	0.0005525
	Offset	240
	Data_description	Snow and ice surface temperature based on a model snow (SIST): SIST = slope*DN + offset
	Unit	kelvin
	Maximum_valid_DN	59999
	Minimum_valid_DN	0
	Error_DN	65535
	No_retrieval_DN_(night)	65534
	No_retrieval_DN_(no_main_VN_SW_channels)	65533
	No_retrieval_DN_(no_main_IR_channels)	65532
	No_retrieval_DN_(out_of_parameter_range)	65531
	Mask_for_statistics	28797	詳細: QA_flag情報(～L3_mask)
SALB
SALB 16-bit unsigned integer	Slope	0.00002
	Offset	0
	Data_description	Direct retrievals of broadband blue sky snow albedo (SALB): SALB = slope*DN + offset
	Unit	No unit
	Maximum_valid_DN	50000
	Minimum_valid_DN	0
	Error_DN	65535
	No_retrieval_DN_(night)	65534
	No_retrieval_DN_(no_main_VN_SW_channels)	65533
	No_retrieval_DN_(no_main_IR_channels)	65532
	No_retrieval_DN_(out_of_parameter_range)	65531
	Mask_for_statistics	28797	詳細: QA_flag情報(～L3_mask)

使い方

・物理量=DN*slope+offset
・有効値はMinimum_valid_DN～Maximum_valid_DN

・雪氷特性 (SIPR)アルゴリズムに以下の制約があります。(2020年7月28日追記)
雪氷特性 (SIPR)の一部タイルのQAフラグに不正な値が入り、L2統計・L3マッププロダクトに意図しない値が格納される。
[影響範囲]
対象プロダクト：L2 SIPR, L2タイル時間統計SIPR（SGSL, SIST）, L3（SGSL,SIST）
プロダクトバージョン：Ver.2（2000）

雪氷特性 (SIPR) [DOI: 10.57746/EO.01gs73b3t54vbanyyszgcvqtsy] [DOI: 10.57746/EO.01gs73b3v45wngznvj72tfkg36]

概要

Ver2での変更点

Ver3での変更点

サンプル画像

格納物理量

QA_flag情報

Attribute情報

使い方

雪氷特性 (SIPR)

[DOI: 10.57746/EO.01gs73b3t54vbanyyszgcvqtsy]
[DOI: 10.57746/EO.01gs73b3v45wngznvj72tfkg36]