Water Quality Accuracy Test from Sentinel-2 Imagery in The Pasee-Peusangan Watershed Area

Abstract The use of satellite imagery for monitoring water quality will be very practical as well as efficient in terms of time and cost, and can provide information on a very wide area. the purpose of this study was to identify water quality against the TSS parameter and in the Pasee-Peusangan watershed using Sentinel-2 Imagery. Evaluation was carried out through a qualitative method of a combination of NDTI and NDWI and TSS water quality parameter values. After that, a validation test was carried out using the RMSE, RE and R^2 methods. The TSS value as a water quality parameter in the Pasee-Peusangan Watershed ranges from 0 to 43.908035 (mg/l), areas with low concentrations of TSS predominate with an area of 533.868 Ha or around 98.15%. While the medium and high categories are between 0.2% and 1% respectively, the very high TSS category is 0.1% of the study area. Test Image validation test using the RMSE, RE and \({R}^{2}\)formulas, RMSE shows the suitability and accuracy of field and image data. The water quality in the Pasee-Peusangan Watershed is in the class 1 and class 2 categories, which means it is still relatively good.