海面水温（SST）
概要
| SST | 定義 | 海面の(バルク)温度(雲検知含む) |
| 単位 | deg.C | |
| ATBD |
Ver.1 (Oct. 2018) Ver.2 (Jun. 2020) Ver.3 (Oct. 2021) |
Ver.2での変更点
- ・ひまわりコンポジットデータ追加
- ・SD配列（Image_data/Cloud_probability）の追加
- ・雲マスクアルゴリズムの改良（沿岸・内水域雲マスク見直し等）
- ・QAフラグ変更
Ver.3での変更点
- ・SST推定に係る大気補正改善
- ・雲マスク処理改訂
- ・L1Bのフィルタリング（縞取り）を前処理に追加
- ・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 |
SSTNQ(250m) SSTDQ(250m) |
SSTNQ(250m) SSTDQ(250m) |
|---|---|---|---|
| Image |
TBU |
SSTDQ(250m) |
SSTDQ(250m) |
格納物理量
| Data name | Description |
|---|---|
| Line_tai93 | TAI93 at each line |
| QA_flag | |
| SST | Sea Surface Temperature[SST] |
| Data name | Description |
|---|---|
| Cloud_probability | Cloud Probability |
| Line_tai93 | TAI93 at each line |
| QA_flag | |
| SST | Sea Surface Temperature[SST] |
QA_flag情報
Ver.1 Ver.2 Ver.3 Ver.1(Sample Image) Ver.2(Sample Image) Ver.3(Sample Image)
| Bit | Data name | 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 | 0 | |
| 7 | no | 0 | |
| 8 | 1: daytime, 0: nighttime or no visible data | 0 | |
| 9 | no | 0 | |
| 10 | no | 0 | |
| 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 |
* 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 | 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 | 0 | |
| 7 | reserved | 0 | |
| 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 | 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 | Data name | 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 | 0 | |
| 7 | reserved | 0 | |
| 8 | 1: daytime, 0: nighttime or no visible data | 0 | |
| 9 | Near Land | one or more land pixels within the 5x5-pixel window | 0 |
| 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 | 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。
*Download:QA_flag(Ver1)
Attribute情報
使い方
- ・物理量=DN*slope+offset
- ・有効値はMinimum_valid_DN～Maximum_valid_DN