ELITE surface longwave upward radiaiton: FY-4A/AGRI hourly 4km all-sky SLUR (2019.04-06)

The Essential thermaL Infrared remoTe sEnsing (ELITE) product suite currently has four types of products, including land surface temperature (LST: clear-sky and all-sky), emissivity (NBE: narrowband emissivity; BBE: broadband emissivity; and spectral emissivity), the component of surface radiation and energy budget (SLUR: surface longwave upwelling radiation; SLDR: surface longwave downward radiation SLDR; SLNR: surface longwave net radiation), and the component of Earth’s radiation budget (OLR; outgoing longwave radiation; RSR: reflected solar radiation). The spatial-temporal resolutions of the ELITE products are mainly determined by the employed satellite data sources. For more information about ELITE products, please refer to the website (https://elite.bnu.edu.cn).

This dataset is the 4km hourly all-sky SLUR product derived by the hybrid method under clear-sky conditions and the machine learning method under cloudy-sky conditions from the FY-4A/AGRI thermal infrared data, covering the AGRI 4km nominal fixed disc (80.6°N-80.6°S, 24.1°E-174.7°W). The in-situ validation results show that the bias (RMSE) of the retrieved AGRI SLUR are -0.67 (18.5) W/m2 under clear-sky conditions, 1.05 (23.77) W/m2 under cloudy-sky conditions, and -0.26 (19.87) under all-sky conditions, respectively. The temporal resolution and spatial resolution of this dataset are one hour and 4km, respectively.

This is the ELITE FY-4A/AGRI all-sky SLUR product from April to June 2019. Please click here to download the ELITE FY-4A/AGRI all-sky SLUR product from July to September 2019 and click here to download the ELITE FY-4A/AGRI all-sky SLUR product from January to  March 2019.

Dataset Characteristics:

Spatial Coverage: AGRI nominal fixed disc (80.6°N-80.6°S, 24.1°E-174.7°W)

Temporal Coverage: 2019

Spatial Resolution: 4 km (subsatellite point)

Temporal Resolution: one hour

Data Format: NC

Scale: 0.01

If you have any questions, please contact Prof. Jie Cheng ([e-mail]).

核心热红外遥感（Essential Thermal Infrared Remote Sensing, ELITE）产品套件目前包含四类产品：1. 地表温度（Land Surface Temperature, LST）：涵盖晴空与全天空条件下的产品；2. 发射率：包含窄带发射率（Narrowband Emissivity, NBE）、宽带发射率（Broadband Emissivity, BBE）以及光谱发射率；3. 地表辐射与能量收支组分：包含地表长波上行辐射（Surface Longwave Upwelling Radiation, SLUR）、地表长波下行辐射（Surface Longwave Downward Radiation, SLDR）以及地表长波净辐射（Surface Longwave Net Radiation, SLNR）；4. 地球辐射收支组分：包含出射长波辐射（Outgoing Longwave Radiation, OLR）以及反射太阳辐射（Reflected Solar Radiation, RSR）。ELITE产品的时空分辨率主要由所采用的卫星数据源决定。如需了解ELITE产品的更多信息，请访问官网：https://elite.bnu.edu.cn。

本数据集为基于风云四号A星（Fengyun-4A Satellite, FY-4A）/先进静止轨道辐射成像仪（Advanced Geostationary Radiation Imager, AGRI）热红外数据生成的4公里级逐时全天空地表长波上行辐射（SLUR）产品，其生成方案为：晴空条件下采用混合方法，多云条件下采用机器学习方法，覆盖AGRI 4公里标称固定圆盘区域（80.6°N-80.6°S，24.1°E-174.7°W）。原位验证结果表明，反演得到的AGRI SLUR产品在晴空条件下的偏差（均方根误差Root Mean Square Error, RMSE）为-0.67（18.5）W/m²，多云条件下为1.05（23.77）W/m²，全天空条件下为-0.26（19.87）W/m²。本数据集的时间分辨率为1小时，空间分辨率为4公里。

本数据集为2019年4月至6月的ELITE FY-4A/AGRI全天空SLUR产品。请点击此处下载2019年7月至9月的ELITE FY-4A/AGRI全天空SLUR产品，以及点击此处下载2019年1月至3月的ELITE FY-4A/AGRI全天空SLUR产品。

数据集特征：
- 空间覆盖范围：AGRI标称固定圆盘区域（80.6°N-80.6°S，24.1°E-174.7°W）
- 时间覆盖范围：2019年
- 空间分辨率：4公里（星下点）
- 时间分辨率：1小时
- 数据格式：NC
- 缩放比例：0.01

如有任何疑问，请联系程杰教授（邮箱：[e-mail]）。