VIIRS/JPSS1 BRDF/Albedo NBAR at Solar Noon Band M7 Daily L3 Global 30ArcSec CMG V002

The NOAA-20 Visible Infrared Imaging Radiometer Suite (VIIRS) Bidirectional Reflectance Distribution Function (BRDF) and Albedo Nadir BRDF-Adjusted Reflectance (NBAR) for Band M7 (VJ143D85) 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.

VJ143D80 through VJ143D89 are the NBAR products of the VJ143D BRDF/Albedo product suite. NBAR values are provided for the nine VIIRS moderate resolution bands (M1 through M5, M7, M8, M10, and M11) included in the [VJ143MA4](https://doi.org/10.5067/VIIRS/VJ143MA4.002) product. In addition to the bands included in VJ143MA4, this product suite includes NBAR values for the VIIRS Day/Night Band (DNB). The NBAR algorithm removes view angle effects from directional reflectances to model the values as if they were collected from a nadir view at local solar noon. Details regarding methodology are available on the VJ143MA4 product page and in the Algorithm Theoretical Basis Document (ATBD).

VJ143D85 is the NBAR for VIIRS band M7 (0.865 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).

美国国家海洋和大气管理局-20卫星（NOAA-20）搭载的可见光红外成像辐射计套件（Visible Infrared Imaging Radiometer Suite, VIIRS）的M7波段（VJ143D85）双向反射分布函数（Bidirectional Reflectance Distribution Function, BRDF）与反照率天底视角BRDF校正反射率（Nadir BRDF-Adjusted Reflectance, NBAR）数据集，以30角秒（1000米）的空间分辨率基于16天观测数据每日生成。数据以第九天为时间加权基准，该信息体现在文件名中。VJ143D产品套件采用气候建模网格（Climate Modeling Grid, CMG）格式，覆盖全球范围，用于气候模拟模型。由于文件体积较大，每个VJ143D产品仅包含一个数据层。

VJ143D80至VJ143D89属于VJ143D BRDF/反照率产品套件中的NBAR产品。NBAR数值对应[VJ143MA4](https://doi.org/10.5067/VIIRS/VJ143MA4.002)产品包含的9个VIIRS中分辨率波段（M1至M5、M7、M8、M10及M11）。除VJ143MA4涵盖的波段外，本产品套件还新增了VIIRS昼夜波段（Day/Night Band, DNB）的NBAR数值。NBAR算法可去除方向反射中的观测角度影响，将反射率模拟为当地太阳正午时刻天底视角下的观测值。相关方法学细节可参见VJ143MA4产品页面及算法理论基础文档（Algorithm Theoretical Basis Document, ATBD）。

VJ143D85为VIIRS M7波段（0.865 μm）的NBAR数据集。

已知问题
* 如需完整的已知问题信息，请参阅[中分辨率成像光谱仪（Moderate Resolution Imaging Spectroradiometer, MODIS）/VIIRS陆地质量评估网站](https://landweb.modaps.eosdis.nasa.gov/knownissue)。