Introduction

Update contents of Ver.2

• ・Improved the algorithm and LUT
• ・Modified the SD array （Image_data/Understory_NDVI --->>> Image_data/Overstory_LAI）
• ・Modified QA flag

Update contents of Ver.3

• ・Modified estimation algorithm, LUT, and parameters
• ・Changed input data (previous RSRFQ data are not used)
• ・Changed base map to SGLI forest structure map
• ・Modified QA_flag
• ・Modified Mask_for_statistics

Sample image

Dataset name

Ver.1 Ver.2,3

QA_flag information

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

Bit	ver1	Description	FAPAR_L3_mask*	LAI_L3_mask*	Understory_NDVI_L3_mask*
0	no data	1: any of used bands are error	1	1	1
1	land/water	0: water >50%, 1: land > 50%	0	0	0
2	mixed with land/water	1: land and water > 1%	0	0	0
3	cloud	1: cloud	1	1	1
4	probably cloud	1: probably cloud	0	0	0
5	snow or ice	1: snow or ice	0	0	0
6	cloud shadow	1: shadow	0	0	0
7	The condition of sensor zenith angle is not good	1: vzan>40 or vzas < 40	0	0	0
8	land cover type	land cover type for used LUT	0	0	0
9	land cover type	land cover type for used LUT	0	0	0
10	land cover type	land cover type for used LUT	0	0	0
11	quality level	quality	0	0	0
12	quality level	quality	0	0	0
13	Value could not be retrieved	1: LAI/FAPAR could not be retrieved	0	0	0
14	unavailability of understory NDVI	1: fixed value was assigned for understory NDVI	0	0	0
15	backup algorithm	1: backup algorithm was applied	0	0	0

 * Bits masked by statistical processing are indicated by 1.

 Please refer to here to the detail information for QA flag.

Bit	ver2	Description	FAPAR_L3_mask*	LAI_L3_mask*	Overstory_LAI_L3_mask*
0	no data	1: any of used bands are error	1	1	1
1	land/water	0: water >50%, 1: land > 50%	0	0	0
2	mixed with land/water	1: land and water > 1%	0	0	0
3	cloud	1: cloud	1	1	1
4	probably cloud	1: probably cloud	0	0	0
5	snow or ice	1: snow or ice	0	0	0
6	cloud shadow	1: shadow	1	1	1
7	The condition of sensor zenith angle is not good	1: vzan>40 or vzas < 40	1	1	1
8	land cover type	land cover type for used LUT	0	0	0
9	land cover type	land cover type for used LUT	0	0	0
10	land cover type	land cover type for used LUT	0	0	0
11	quality level	quality	0	0	0
12	quality level	quality	0	0	0
13	Value could not be retrieved	1: LAI/FAPAR could not be retrieved	0	0	0
14	pol cloud or high-tau	1: pol cloud/high-tau	1	1	1
15	backup algorithm	1: backup algorithm was applied	1	1	1

 * Bits masked by statistical processing are indicated by 1.

 Please refer to here to the detail information for QA flag.

Bit	ver2	Description	FAPAR_L3_mask*	LAI_L3_mask*	Overstory_LAI_L3_mask*
0	no data	1: any of used bands are error	1	1	1
1	land/water	0: water >50%, 1: land > 50%	0	0	0
2	mixed with land/water	1: land and water > 1%	0	0	0
3	cloud	1: cloud	1	1	1
4	bad air condition	1: bad air condition	0	0	0
5	snow or ice	1: snow or ice	0	0	0
6	cloud shadow	1: shadow	1	1	1
7	The condition of sensor zenith angle is not good	1: vzan>40 or vzas < 40	1	1	1
8	land cover type	land cover type for used LUT	0	0	0
9	land cover type	land cover type for used LUT	0	0	0
10	land cover type	land cover type for used LUT	0	0	0
11	quality level	00:good, 10:acceptance, 01:unreliable, 11:poor	0	0	0
12			0	0	0
13	Value could not be retrieved	1: LAI/FAPAR could not be retrieved	0	0	0
14	pol cloud or high-tau	1: pol cloud/high-tau	0	0	0
15	backup algorithm	1: backup algorithm was applied	1	1	1

 * 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(Ver.1)

QA_flag(Ver.2)

QA_flag(Ver.3)

Attribute information

Ver.1 Ver.2 Ver.3

How to use

• ・Physical quantity＝DN*slope + offset
• ・Valid values are during Minimum_valid_DN～Maximum_valid_DN