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

The VIIRS/JPSS1 BRDF/Albedo Quality Daily L3 Global 1 km SIN Grid Near Real Time (NRT), short-name VJ143MA2N product provides BRDF and Albedo quality at 1 km resolution. The VNP43MA2N 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 VJ143MA2N data product provides a total of 23 SDS layers including: BRDF/Albedo band quality and days of valid observation within a 16-day period for VIIRS moderate resolution bands: M1-M5, M7-M8, and M10-M11, as well as land water type class flag, snow BRDF albedo class flag, local solar noon, and the platform name.

VIIRS/JPSS1 反射率/反照率质量每日 L3 全球 1 公里 SIN 网格近实时（NRT）数据产品，简称 VJ143MA2N，提供 1 公里分辨率的反射率与反照率质量。VNP43MA2N 产品每日生成，利用为期 16 天的 VIIRS 数据（即当前日及前 15 日）。该算法采用 RossThick/Li-Sparse-Reciprocal（RTLSR）半经验核驱动 BRDF 模型，利用来自 VJ143MA1N 的三个核权重重建表面各向异性效应，校正方向反射率至通用视几何（VJ143MA4N），同时计算本地太阳中午的集成暗天空反照率（BSA）及白天空反照率（WSA）（VJ143MA3N）。研究者可利用 BRDF 模型参数与简单的多项式，获取任何太阳光照角度下的暗天空反照率。同样，BSA 和 WSA 科学数据集（SDS）层也可通过简单多项式进行使用，以手动估算瞬时实际反照率（晴空反照率）。关于方法论的详细信息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…。VJ143MA2N 数据产品提供总计 23 个 SDS 层，包括：VIIRS 中分辨率波段 M1-M5、M7-M8 以及 M10-M11 在 16 天周期内的反射率/反照率波段质量及有效观测日数、陆地水体类型类别标志、雪面反射率反照率类别标志、本地太阳中午时刻以及平台名称。