葉面積指数 (LAI)
[DOI: 10.57746/EO.01gs73b3fbqvrh589dwwr99xna]
概要
| LAI | 定義 | 単位面積あたりの植生の葉の片面の総面積 |
| 単位 | 無次元 | |
| ATBD |
Ver.1 (Nov. 2011) Ver.2 (Jun. 2020) Ver.3 (Oct. 2021) |
|
| FAPAR | 定義 | 植生が吸収する光合成有効放射(PAR)の割合 |
| 単位 | 無次元 | |
| ATBD |
Ver.1 (Nov. 2011) Ver.2 (Jun. 2020) Ver.3 (Oct. 2021) |
Ver.2での変更点
- ・推定アルゴリズム、LUT改良
- ・格納SD配列変更（Image_data/Understory_NDVI --->>> Image_data/Overstory_LAI）
- ・QAフラグ変更
Ver.3での変更点
- ・推定アルゴリズムの改訂、LUT・パラメータ改訂
- ・過去RSRFQは使用しないように変更
- ・Base MapをSGLI森林構造マップに変更
- ・QA_flagの変更
- ・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 |
LAI_Q(250m) |
LAI_Q(250m) |
| Image |
TBU |
LAI(250m) Overstory_LAI(250m) FAPAR(250m) |
LAI(250m) Overstory_LAI(250m) FAPAR(250m) |
格納物理量
| Ver.1 | Description |
|---|---|
| FAPAR | Fraction of Absorbed Photosynthetically Active Radiation |
| LAI | Leaf Area Index |
| QA_flag | |
| Understory_NDVI | Normalized Difference Vegetation Index |
| Ver.2,3 | Description |
|---|---|
| FAPAR | Fraction of Absorbed Photosynthetically Active Radiation |
| LAI | Leaf Area Index |
| QA_flag | |
| Overstory_LAI | Leaf Area Index |
QA_flag情報
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 |
* 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 | 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 |
* 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 | 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)
Attribute情報
使い方
- ・物理量=DN*slope+offset
- ・有効値はMinimum_valid_DN～Maximum_valid_DN