VIIRS/JPSS1 Albedo Daily L3 Global 1km SIN Grid NRT

The VIIRS/JPSS1 Albedo Daily L3 Global 1 km SIN Grid Near Real Time (NRT), short-name VJ143MA3N product provides albedo values at 1 km resolution for the bi-hemispherical reflectance white-sky albedos (WSA) and directional hemispherical reflectance black-sky albedos (BSA) at local solar noon. The VJ143MA3N product is produced daily using 16-day VIIRS data (i.e., the current day and the previous 15 days).

The algorithm uses the RossThick/Li-Sparse-Reciprocal (RTLSR) semi-empirical kernel-driven BRDF model, with the three kernel weights from VJ143MA1N to reconstruct surface anisotropic effects, correcting the directional reflectance to a common view geometry (VJ143MA4N), while also computing integrated black-sky albedo (BSA) at local solar noon and white-sky albedo (WSA) (VJ143MA3N). Researchers can use the BRDF model parameters with a simple polynomial, to obtain black-sky albedo at any solar illumination angle. Likewise, both the BSA and WSA Science Dataset (SDS) layers can be used with a simple polynomial, to manually estimate instantaneous actual albedo (blue-sky albedo). Additional details regarding the methodology are available in the Algorithm Theoretical Basis Document (ATBD) at https://www.umb.edu/editor_uploads/images/school_for_the_environment_cs…

The VJ143MA3N product provides a total of 36 SDS layers including: BSA, WSA, and mandatory quality layers for nine VIIRS moderate bands: M1-M5, M7-M8, and M10-M11, as well as three broadbands: near-infrared (NIR), shortwave infrared (SWIR), and visible (VIS).

该VIIRS/JPSS1反照率每日L3全球1公里SIN网格近实时（NRT）产品，简称VJ143MA3N，提供了在1公里分辨率下的双半球反射率白天空反照率（WSA）和当地时间正午方向半球反射率黑天空反照率（BSA）的数值。VJ143MA3N产品基于16天VIIRS数据（即当前日及其前15天）每日生成。该算法采用罗斯厚/李稀疏-互易（RTLSR）半经验核驱动双向反射分布函数（BRDF）模型，利用来自VJ143MA1N的三个核权重来重建地表各向异性效应，并校正方向反射率至统一的视角几何（VJ143MA4N），同时计算当地时间正午的集成黑天空反照率（BSA）和白天空反照率（WSA）（VJ143MA3N）。研究者可以使用BRDF模型参数和简单的多项式，以获取任何太阳光照角度下的黑天空反照率。同样，BSA和WSA科学数据集（SDS）层也可以通过简单的多项式进行使用，以手动估算瞬时实际反照率（蓝天空反照率）。关于方法的详细说明可在算法理论基础文档（ATBD）中找到，文档链接为https://www.umb.edu/editor_uploads/images/school_for_the_environment_cs…。VJ143MA3N产品包含总计36个SDS层，包括：BSA、WSA以及九个VIIRS中波段的强制性质量层：M1-M5、M7-M8和M10-M11，以及三个宽带：近红外（NIR）、短波红外（SWIR）和可见光（VIS）。