VIIRS/JPSS1 BRDF/Albedo BSA at Solar Noon Band M1 Daily L3 Global 30ArcSec CMG V002

The NOAA-20 Visible Infrared Imaging Radiometer Suite (VIIRS) Bidirectional Reflectance Distribution Function (BRDF) and Albedo Black-Sky Albedo for Band M1 (VJ143D54) is produced daily using 16 days of data at 30 arc second (1,000 meter) resolution. Data are temporally weighted to the ninth day, which is reflected in the file name. The VJ143D product suite is provided in a Climate Modeling Grid (CMG), which covers the entire globe for use in climate simulation models. Due to the large file size, each VJ143D product contains just one data layer.

VJ143D54 through VJ143D79 are the albedo products of the VJ143D BRDF/Albedo product suite. Black-sky albedo (BSA) and white-sky albedo (WSA) values are provided for the nine VIIRS moderate resolution bands (M1 through M5, M7, M8, M10, and M11) along with the visible, near-infrared (NIR), and shortwave bands included in the [VJ143MA3](https://doi.org/10.5067/VIIRS/VJ143MA3.002) product. In addition to the bands included in VJ143MA3, this product suite includes albedo values for the VIIRS Day/Night Band (DNB). The black-sky albedo (directional hemispherical reflectance) is defined as albedo in the absence of a diffuse component and is a function of solar zenith angle. White-sky albedo (bihemispherical reflectance) is defined as albedo in the absence of a direct component when the diffuse component is isotropic. Details regarding methodology are available on the VJ143MA3 product page and in the Algorithm Theoretical Basis Document (ATBD).

VJ143D54 is the BSA for VIIRS band M1 (0.412 μm).

Known Issues

* For complete information about known issues please refer to the [MODIS/VIIRS Land Quality Assessment website]( https://landweb.modaps.eosdis.nasa.gov/knownissue).

NOAA-20 可见红外成像辐射计套件（Visible Infrared Imaging Radiometer Suite, VIIRS）的双向反射分布函数（Bidirectional Reflectance Distribution Function, BRDF）与反照率产品集中的M1波段（VJ143D54）黑空反照率，每日基于16天的观测数据生成，分辨率为30角秒（约1000米）。数据在时间维度上加权至第9天，该加权信息将体现在文件名中。VJ143D产品集采用气候建模网格（Climate Modeling Grid, CMG）格式，覆盖全球范围，适用于气候模拟模型。由于文件体积较大，每个VJ143D产品仅包含单一数据层。

VJ143D54至VJ143D79属于VJ143D BRDF/反照率产品集中的反照率产品。该产品为VIIRS的9个中分辨率波段（M1至M5、M7、M8、M10及M11），以及[VJ143MA3](https://doi.org/10.5067/VIIRS/VJ143MA3.002)产品中包含的可见光、近红外（Near-Infrared, NIR）和短波波段提供了黑空反照率（Black-Sky Albedo, BSA）与白空反照率（White-Sky Albedo, WSA）数值。除VJ143MA3包含的波段外，本产品集还为VIIRS日间/夜间波段（Day/Night Band, DNB）提供反照率数值。黑空反照率（方向半球反射率）被定义为无漫射分量时的反照率，是太阳天顶角的函数；白空反照率（双向半球反射率）被定义为无直射分量且漫射分量各向同性时的反照率。关于方法学的详细信息可参阅VJ143MA3产品页面及算法理论基础文档（Algorithm Theoretical Basis Document, ATBD）。

VJ143D54即为VIIRS M1波段（0.412 μm）的黑空反照率。

已知问题
* 如需获取已知问题的完整信息，请参阅[MODIS/VIIRS陆地质量评估网站](https://landweb.modaps.eosdis.nasa.gov/knownissue).