Highest Quality Remote Sensing Reflectance Database Compiled from 20+ years of MODIS-Aqua measurements

This database provides rigorously screened, highest-quality remote sensing reflectance (Rrs), spectra from the MODIS Aqua sensor at 4 km spatial resolution, covering seven wavelengths (412 nm, 443 nm, 488 nm, 531 nm, 547 nm, 667 nm, and 678 nm). It includes both 8-day and monthly composite products. The data are screened using CHQR (Criteria of the Highest-Quality Rrs) to have the selected Rrs spectrum meet the following conditions simultaneously: Optimal observation conditions (excluding clouds, sun glints, etc.) Spectral consistency with true water optical properties Minimal residual uncertainties本数据库提供经过严格筛选的最高质量遥感反射率（remote sensing reflectance, Rrs）光谱数据，源自空间分辨率为4 km的MODIS Aqua传感器，覆盖412 nm、443 nm、488 nm、531 nm、547 nm、667 nm与678 nm共7个波段波长。该数据集包含8天合成与月合成两类产品。数据采用最高质量Rrs标准（Criteria of the Highest-Quality Rrs, CHQR）进行筛选，确保入选的Rrs光谱同时满足以下条件：• 最优观测条件（排除云层、太阳耀斑等干扰）• 光谱特性与真实水体光学性质保持一致• 残留不确定性极低