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

The VIIRS/NPP Albedo Daily L3 Global 1 km SIN Grid Near Real Time (NRT), short-name VNP43MA3N 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 VNP43MA3N product is produced daily using 16-day VIIRS data (i.e., the current day and the previous 15 days).

The VNP43 algorithm uses the RossThick/Li-Sparse-Reciprocal (RTLSR) semi-empirical kernel-driven BRDF model, with the three kernel weights from VNP43MA1N to reconstruct surface anisotropic effects, correcting the directional reflectance to a common view geometry (VNP43MA4N), while also computing integrated black-sky albedo (BSA) at local solar noon and white-sky albedo (WSA) (VNP43MA3N). 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 VNP43MA3N 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/NPP反照率每日L3全球1公里SIN网格近实时（NRT）产品，简称VNP43MA3N，提供了1公里分辨率的半球反射率白天空反照率（WSA）和当地正午太阳方位的定向半球反射率黑天空反照率（BSA）。VNP43MA3N产品基于16天的VIIRS数据（即当前日及前15日）每日生成。VNP43算法采用基于罗斯厚/李稀疏-互反（RTLSR）半经验核驱动双向反射分布函数（BRDF）模型，利用VNP43MA1N中的三个核权重来重建表面各向异性效应，并校正定向反射率至公共视几何（VNP43MA4N），同时计算当地正午的黑天空反照率（BSA）和白色天空反照率（WSA）（VNP43MA3N）。研究人员可以使用BRDF模型参数与简单的多项式相结合，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）层也可以与简单的多项式结合使用，以手动估算即时实际反照率（蓝天空反照率）。有关方法的详细信息，可在算法理论依据文档（ATBD）中找到，文档链接为https://www.umb.edu/editor_uploads/images/school_for_the_environment_cs…。VNP43MA3N产品包含共计36个SDS层，包括：BSA、WSA以及九个VIIRS中波段的强制质量层：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）。