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

The VIIRS/JPSS1 BRDF/Albedo Model Parameters Daily L3 Global 1 km SIN Grid Near Real Time (NRT), short-name VJ143MA1N product provides BRDF/Albedo model parameters at 1 km resolution. The VJ143MA1N 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 VJ143MA1N data product provides a total of 24 SDS layers including: mandatory quality bands and three multi-dimensional model parameter bands representing fiso, fvol, and fgeo for VIIRS moderate resolution bands: M1-M5, M7-M8, and M10-M11.

VIIRS/JPSS1 反射率/反照率模型参数每日L3全球1公里SIN网格近实时(NRT)产品，简称VJ143MA1N，提供1公里分辨率的BRDF/反照率模型参数。VJ143MA1N产品每日生成，使用16天的VIIRS数据（即当前日及前15日）。该算法采用基于RossThick/Li-Sparse-Reciprocal（RTLSR）半经验核驱动BRDF模型，通过从VJ143MA1N中提取三个核权重，以重建地表各向异性效应，并将方向反射率校正至通用视几何（VJ143MA4N），同时计算当地时间正午的集成黑天空反照率（BSA）（VJ143MA3N）和白云空反照率（WSA）。研究人员可以使用BRDF模型参数与简单的多项式相结合，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）层也可以与简单的多项式相结合，以手动估算瞬时实际反照率（蓝天空反照率）。有关该方法的更多细节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…。VJ143MA1N数据产品提供共计24个SDS层，包括强制性质量带以及三个代表VIIRS中高分辨率波段（M1-M5，M7-M8，M10-M11）的fiso、fvol和fgeo的多维模型参数带。