VIIRS/NPP BRDF/Albedo NBAR at Solar Noon Band M5 Daily L3 Global 30ArcSec CMG V001

The VNP43D84 Version 1 data product was decommissioned on July 31, 2025. Users are encouraged to use the [VNP43D84](https://doi.org/10.5067/VIIRS/VNP43D84.002) and [VJ143D84](https://doi.org/10.5067/VIIRS/VJ143D84.002) Version 2 data products. The NASA/NOAA Suomi National Polar-orbiting Partnership (Suomi NPP) Visible Infrared Imaging Radiometer Suite (VIIRS) Bidirectional Reflectance Distribution Function (BRDF) and Albedo Nadir BRDF-Adjusted Reflectance (NBAR) for Band M5 (VNP43D84) 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 VNP43D 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 VNP43D product contains just one data layer. VNP43D80 through VNP43D89 are the NBAR products of the VNP43D 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 [VNP43MA4](https://doi.org/10.5067/VIIRS/VNP43MA4.001) product. In addition to the bands included in VNP43MA4, 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 [VNP43MA4](https://doi.org/10.5067/VIIRS/VNP43MA4.001) product page and in the Algorithm Theoretical Basis Document (ATBD). VNP43D84 is the NBAR for VIIRS band M5 (0.672 μm). Known Issues * The abnormally high activation of the high aerosol flag in the Collection 1 (C1) VNP09 product has impacted downstream products. The VNP43 BRDF/Albedo/NBAR product is affected by reducing the number of otherwise acceptable observations used as input to characterize surface anisotropy. This effect (most obvious over arid bright surfaces), results in a reduced number of high quality full BRDF model inversions. Therefore, users should be aware that bright arid surfaces (normally associated with high quality BRDF/Albedo/NBAR retrievals) are likely to be somewhat represented by lower quality results in C1. VNP09 has been corrected for Collection 2 (C2). Therefore, users should avoid substantive use of C1 VNP43 over arid regions (and wait for C2 products). In any event, users are **always strongly encouraged** to download and use the extensive QA data provided in VNP43[I-M]A2, in addition to the briefer mandatory QA provided as part of the VNP43[I-M]A1, 3 and 4 products. * For complete information about known issues please refer to the [MODIS/VIIRS Land Quality Assessment website](https://landweb.modaps.eosdis.nasa.gov/knownissue?sensor=VIIRS).VNP43D84 Version 1数据集已于2025年7月31日停用。推荐用户使用[VNP43D84](https://doi.org/10.5067/VIIRS/VNP43D84.002)和[VJ143D84](https://doi.org/10.5067/VIIRS/VJ143D84.002) Version 2数据集。 美国国家航空航天局/美国国家海洋和大气管理局（NASA/NOAA）Suomi国家极地轨道伙伴关系（Suomi NPP）卫星搭载的可见光红外成像辐射计套件（VIIRS）生成的M5波段双向反射分布函数（BRDF）与反照率天底双向反射分布函数调整反射率（NBAR）产品（VNP43D84），采用16天的数据以30角秒（约1000米）分辨率每日生成。数据在时间上加权至第九天，该信息体现在文件名中。VNP43D产品套件基于气候模拟网格（CMG）提供，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VNP43D产品仅包含一个数据层。 VNP43D80至VNP43D89属于VNP43D BRDF/反照率产品套件中的NBAR产品。这些产品为[VNP43MA4](https://doi.org/10.5067/VIIRS/VNP43MA4.001)产品涵盖的九个VIIRS中等分辨率波段（M1至M5、M7、M8、M10及M11）提供NBAR值。除VNP43MA4包含的波段外，该套件还提供VIIRS昼夜波段（DNB）的NBAR值。NBAR算法通过消除方向反射率中的视角效应，将反射率值模拟为当地太阳正午天底视角下的采集结果。方法细节可在[VNP43MA4](https://doi.org/10.5067/VIIRS/VNP43MA4.001)产品页面及算法理论基础文档（ATBD）中获取。 VNP43D84是VIIRS M5波段（0.672微米）的NBAR产品。 已知问题 * Collection 1（C1）版本VNP09产品中高气溶胶标志异常激活，已影响下游产品。VNP43 BRDF/反照率/NBAR产品的合格观测样本数量减少，导致表面各向异性表征受限；该效应在干旱明亮表面尤为明显，高质量完整BRDF模型反演数量下降。因此，用户需注意：干旱明亮表面（通常对应高质量反演结果）在C1版本中可能呈现低质量结果。VNP09产品在Collection 2（C2）版本中已修复，建议用户避免在干旱区域大量使用C1版本VNP43产品（等待C2版本）。无论如何，**强烈建议用户**下载并使用VNP43[I-M]A2中的详尽质量评估（QA）数据，以及VNP43[I-M]A1、3和4产品中的简要强制QA数据。 * 已知问题完整信息请参考[MODIS/VIIRS陆地质量评估网站](https://landweb.modaps.eosdis.nasa.gov/knownissue?sensor=VIIRS)。