The integrated approach of remote sensing and GIS in the analysis of the impact of COVID-19 pandemic on the surface water quality of the river Yamuna.

The COVID-19 pandemic forced all industries to close their doors, and other human activities came to a stop. But the lockdown's effects on the hydrosphere, atmosphere and all life forms were profound. Government officials and environmentalists have been working to clean up the entire artificial facade for several years, but the lockdown has completely altered the situation. As before and during the lockdown water quality measures revealed considerable variations, the COVID-19 epidemic proved to be beneficial for the Yamuna River. The Yamuna is the second-largest Ganges tributary in India and is the country's longest river. Haryana, Uttar Pradesh, Himachal Pradesh, and Uttar Pradesh are the four states and a union territory through which the Yamuna flows (Delhi). For the study, a stretch of river was defined as the distance from Palla, upstream on the Yamuna, to Okhla Barrage, downstream in Delhi. When comparing water quality parameters between before the lockdown (January and February 2020) and during the lockdown (March andApril 2020), visual interpretation using remote sensing and geographic information systems was performed, demonstratingthat there was a considerable drop in turbidity value. In a conclusion, the application of remote sensing and GIS technologies is highly anticipated and beneficial for data processing. [ABSTRACT FROM AUTHOR]