Table 1 AHSI parameters in order to acquire GF-5 satellite synchronous quasi-synchronous measure data for the months of March and December in 2019, a selection was made of ten nationally controlled sampling sites. Among these, two sampling sites were located in Ch, while the remaining eight were situated in Wh, as detailed in Table 2. The monitoring frequency for these sites was set at once per month. Consequently, a total of 20 sets of WQI were obtained. These WQI comprised the biological indicator Chl, as well as five chemical indicators: pH, CODcr, TP, NH3-N, and TN.

From: High precision water quality retrieval in Dianchi Lake using Gaofen 5 data and machine learning methods