GCOM-C/SGLI L2 Statistics-Land Surface Reflectance(RS03) (1-Month,250m)

GCOM-C/SGLI L2 Statistics-Land Surface Reflectance (RS03) (1-Month, 250m) is obtained from the SGLI sensor onboard GCOM-C and produced by the Japan Aerospace Exploration Agency (JAXA). Using the Level 2 atmospheric corrected land surface reflectance tile product as input, BRDF correction is performed for the land surface in clear region using data of multiple days, and the reflectance equivalent to that at nadir view direction is stored in the output product. The region definition and spatial resolutions of the output product are kept the input data. In 1-Month processing, the land surface reflectance data of the past 1 month, respectively are fitted to generate appropriate BRDF models with the correction coefficients. GCOM-C is Sun-synchronous sub-recurrent Orbit satellite launched on December 23, 2017, which mounts SGLI and conducts long-term global observations of geophysical variables related to the global climate system across 28 items including aerosol and vegetation over 4 areas of atmosphere, land, ocean, and cryosphere. The data will be used to contribute to higher accuracy of global warming prediction. The SGLI has swath of 1150 km in the visible band and 1400 km in the infrared band. This dataset includes of following SDs (Center Wavelength is correspond to channel name as same as L1B): Rs_RS03_AVE is Average surface reflectance [unit: none] Rs_RS03_Date is Date identification of surface reflectance [unit: none] Rs_RS03_MAX is Maximum of surface reflectance [unit: none] Rs_RS03_MIN is Minimum of surface reflectance [unit: none] Rs_RS03_Ninput is Input data number of surface reflectance [unit: none] Rs_RS03_Nused is Used data number of surface reflectance [unit: none] Rs_RS03_QA_flag is quality flag about the statistics and BRDF regression [unit: none] Rs_RS03_RMS is root-mean-square (RMS) of BRDF model regression of surface reflectance [unit: none] Rs_RS03_c0-2 are c0, c1, and c2 coefficients of surface reflectance [unit: none] The provided format is HDF5. The spatial resolution is 250 m. The statistical period is 1 month also 8 days statistics is available. The projection method is EQA. The generation unit is Tile. The current version of the product is Version 3. The Version 2 is also available.

GCOM-C/SGLI L2级统计陆地表面反射率（RS03）数据集（月度，250米分辨率）由搭载于GCOM-C卫星的SGLI传感器获取，由日本宇宙航空研究开发机构（JAXA）制作。该数据集以经过大气校正的L2级陆地表面反射率分幅产品作为输入，利用多日观测数据对晴空区域的陆地表面开展双向反射分布函数（Bidirectional Reflectance Distribution Function，BRDF）校正，并将等效于天底观测方向的反射率存储于输出产品中。输出产品的区域范围与空间分辨率与输入数据保持一致。在月度处理流程中，将过去一个月的陆地表面反射率数据分别进行拟合，以生成带有校正系数的适配BRDF模型。

GCOM-C是2017年12月23日发射的太阳同步准回归轨道卫星，搭载SGLI传感器，针对大气、陆地、海洋、冰冻圈四大领域，开展涉及气溶胶、植被等28项与全球气候系统相关的地球物理变量的长期全球观测。本数据集可用于提升全球变暖预测的精度。SGLI传感器的可见光波段幅宽为1150千米，红外波段幅宽为1400千米。

本数据集包含以下科学数据集（Scientific Datasets，SDs），其中心波长与L1B级数据的通道名称对应规则一致：
Rs_RS03_AVE：平均表面反射率，单位：无量纲
Rs_RS03_Date：表面反射率的日期标识，单位：无量纲
Rs_RS03_MAX：表面反射率最大值，单位：无量纲
Rs_RS03_MIN：表面反射率最小值，单位：无量纲
Rs_RS03_Ninput：表面反射率的输入数据量，单位：无量纲
Rs_RS03_Nused：表面反射率的有效使用数据量，单位：无量纲
Rs_RS03_QA_flag：用于表征统计与BRDF回归结果的质量标识，单位：无量纲
Rs_RS03_RMS：表面反射率BRDF模型回归的均方根误差（Root Mean Square，RMS），单位：无量纲
Rs_RS03_c0~c2：表面反射率BRDF模型的c0、c1、c2校正系数，单位：无量纲

本数据集存储格式为HDF5，空间分辨率为250米，统计周期为1个月，同时也支持8天统计周期的数据集。投影方式为EQA，数据生成单元为分幅（Tile）。当前产品版本为V3，同时也提供V2版本的数据。