MODIS/Terra Surface Reflectance Quality Daily L2G Global 1km SIN Grid

The MODIS Near Real Time (NRT) level-2G 1km surface reflectance data state QA product MOD09GST, is a restructured version of its primary input, the state QA data in MOD09_L2. This product summarizes the quality of the MOD09 products, specifically atmospheric and other correction states. The product contains quality assurance data pertaining to cloud and cloud shadow, land and water designations, aerosols, and the data source of corrections performed on the file. The data set also contains the number of observations for each pixel.

MODIS（Moderate Resolution Imaging Spectroradiometer，中分辨率成像光谱仪）近实时（Near Real Time，NRT）二级G级（level-2G）1公里地表反射率数据质量状态QA（Quality Assurance，质量保证）产品MOD09GST，是其核心输入数据——MOD09_L2中的质量状态QA数据的重构版本。本产品用于总结MOD09系列产品的质量状况，具体涵盖大气校正与其他校正的质量状态。该产品包含与云、云影、水陆标识、气溶胶以及文件校正所用数据源相关的质量保障数据，同时还包含每个像素对应的观测次数。