中分辨率成像光谱辐射计（MODIS）MCD43A4 版本 6.1 正射方向双向反射分布函数（BRDF）校正反射率（NBAR）数据集每日生成，使用 Terra 和 Aqua MODIS 16 天的数据，空间分辨率为 500 米。该数据集消除了观测角度的影响，从方向性反射率中获得稳定且一致的 NBAR 产品。数据按时间加权至第九日，反映在文件名中的儒略日期中。用户应参考用户指南，利用波段特定的质量标志，筛选出最高质量的完整反演结果，以满足自身科学应用需求。MCD43A4 提供了 MODIS 波段 1 至 7 的 NBAR 以及简化的强制质量层。使用该产品时，应同时查阅相应的 MCD43A2 数据文件以获取必要的质量信息。

The Moderate Resolution Imaging Spectroradiometer (MODIS) MCD43A4 Version 6.1 Nadir Bidirectional Reflectance Distribution Function (BRDF)-Adjusted Reflectance (NBAR) dataset is produced daily using 16 days of Terra and Aqua MODIS data at 500 meter (m) resolution. The view angle effects are removed from the directional reflectances, resulting in a stable and consistent NBAR product. Data are temporally weighted to the ninth day which is reflected in the Julian date in the file name. Users are urged to use the band specific quality flags to isolate the highest quality full inversion results for their own science applications as described in the User Guide. The MCD43A4 provides NBAR and simplified mandatory quality layers for MODIS bands 1 through 7. Essential quality information provided in the corresponding MCD43A2 data file should be consulted when using this product.