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
格納物理量
| Ver1,2 |
Description |
| SGSL |
Snow grain size of shallow layer |
| SIST |
Snow and ice surface temperature based on a model snow |
| QA_flag |
|
QA_flag情報
Ver.1
Ver.2
Ver.1(Sample Image)
Ver.2(Sample Image)
| Bit |
ver1 |
Description |
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 |
ver2 |
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。
Attribute情報
Ver.1
Ver.2
| Ver1 |
Attribute |
Remarks |
| Attribute of Image_data |
| Attribute of Image_data |
Number_of_lines |
4800 |
250m: 4800
1km: 1200 |
| Number_of_pixels |
4800 |
| 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) |
| Ver2 |
Attribute |
Remarks |
| Attribute of Image_data |
| Attribute of Image_data |
Number_of_lines |
4800 |
250m: 4800
1km: 1200 |
| Number_of_pixels |
4800 |
| 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) |
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）
