AQUA MODIS High Resolution Level 3 daily aerosol data, 0.1x0.1 degree grid Version 001 (AER_DBDT_D10KM_L3_MODIS_AQUA) at GES DISC

This High-Resolution (0.1 x 0.1 degree) Level 3 daily Aerosol Optical Depth (AOD) product is generated by combining two Moderate Resolution Imaging Spectroradiometer (MODIS) operational algorithms, namely Deep Blue (DB) and Dark Target (DT), on board the AQUA satellite. This dataset is provided in daily files ranging from 2002-07-04 to the present. The spatial coverage is global and the dataset is gridded at 0.1 x 0.1 degree spatial resolution.

The data are generated using Level 2 AOD retrieved using DT and DB algorithms. The product provides multiple options for using data either from DT or DB or combined. Depending on user need and application, they can choose one or more relevant parameter. The pixels with highest quality as recommended by science teams are only considered in these averaging. In addition to averaged AOD at 0.1 x 0.1 degree resolution, standard deviation and number of pixels averaged from each algorithm are also provided. Average sensor zenith angle is also provided for additional filtering of the data.

If you have any questions, please read the README document first and post your question to the NASA Earthdata Forum (forum.earthdata.nasa.gov) or email the GES DISC Help Desk ([e-mail]).

这款高分辨率（0.1×0.1度）的三级每日气溶胶光学厚度（Aerosol Optical Depth, AOD）产品，是通过结合搭载于AQUA卫星上的两款中分辨率成像光谱仪（Moderate Resolution Imaging Spectroradiometer, MODIS）业务化算法——深蓝（Deep Blue, DB）与暗目标（Dark Target, DT）生成的。本数据集以每日文件形式提供，时间跨度为2002年7月4日至今，空间覆盖全球，网格空间分辨率为0.1×0.1度。

该数据基于采用DT与DB算法反演得到的二级AOD数据生成。本产品提供多种数据使用选项，可单独使用DT算法数据、DB算法数据，或二者结合的数据。用户可根据自身需求与应用场景，选择一个或多个相关参数。在平均计算过程中，仅纳入科学团队推荐的最高质量像元。除0.1×0.1度分辨率的平均AOD数据外，数据集还提供各算法反演像元的标准差与参与平均的像元数量。此外还提供平均传感器天顶角，用于数据的额外筛选。

如有任何疑问，请首先查阅README文档，随后可将问题发布至NASA地球数据论坛（forum.earthdata.nasa.gov），或发送邮件至GES DISC服务台（[e-mail]）。